Research activity information

• Sep. 2022 9th International Symposium on Control of Semiconductor Interfaces (ISCSI-XI), ISCSI-XI Young Researcher Award, Photoluminescence Characteristics of InAs Quantum Dots in the Doubled-heterointerface of AlGaAs/GaAs-based Two-step Photon Up-conversion Solar Cells

  H. Mahamu, S. Asahi, T. Kita


• Jun. 2020 47TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC 47), PVSC 47 Best Student Paper Award, Up-converted photocurrent enhancement in modulation-doped two-step photon up-conversion

  K. Watanabe, S. Asahi, T. Kita


• Mar. 2020 日本材料学会, 令和元年度日本材料学会論文賞, デュアルヘテロダイン干渉計により光源起因のノイズを低減したサブナノメートル精度ウエハフラットネス計測システム

  田原和彦、松岡英毅、甘中将人、喜多隆


• Oct. 2019 電子材料シンポジウム, EMS賞, Efficient Laser Cooling in Rare-Earth Doped Oxides at High Temperature

  中山雄太


• Sep. 2019 SemiconNano, SemiconNano2019 Best Poster Award, Laser Cooling Utilizing Anti-Stokes Photoluminescence in Yb-Doped Yttrium Aluminum Garnet

  Y. Nakayama, Y. Harada, and T. Kita


• Jul. 2018 日本材料学会半導体エレクトロニクス部門委員会, 日本材料学会半導体エレクトロニクス部門委員会平成30年度第1回研究会 学生優秀講演賞, Yb添加Yttrium-Aluminum化合物による固体レーザー冷却

  中山雄太、寺田康太、原田幸弘、喜多隆


• Jul. 2017 日本材料学会半導体エレクトロニクス部門委員会, 日本材料学会半導体エレクトロニクス部門委員会 平成29年度第1回研究会 学生優秀講演賞, 低温キャップInAs/GaAs量子ドット超格子中間バンド型太陽電池における2段階光吸収の増強

  平尾 和輝、朝日 重雄、海津 利行、原田 幸弘、喜多 隆


• Sep. 2015 応用物理学会, 応用物理学会フェロー表彰 第9回（2015年度）, 半導体ナノ電子材料の構造制御と電子状態・光物性に関する研究

  喜多隆


• Dec. 2014 第25回光物性研究会, 光物性研究会奨励賞, InAs/GaAs量子ドット超格子太陽電池における高効率2段階光吸収過程

  加田智之、朝日重雄、海津利行、喜多隆、玉置亮、岡田至崇、宮野健次郎


• Nov. 2014 日本材料学会半導体エレクトロニクス部門委員会, 日本材料学会半導体エレクトロニクス部門委員会 平成24年度第3回研究会 学生優秀講演賞, 低次元量子構造を利用したホットキャリア型太陽電池の提案

  渡部大樹、笠松直史、原田幸弘、喜多隆


• Sep. 2014 応用物理学会, APEX/JJAP編集貢献賞, 2014年度（第13回）

  喜多隆


• Jul. 2014 平成26年度第2回半導体エレクトロニクス部門委員会第1回研究会, 日本材料学会半導体エレクトロニクス部門委員会平成26年度第１回研究会学生優秀講演賞, Dot-in-Well構造を用いた量子ドット太陽電池の室温二段階光吸収

  朝日重雄、寺西陽之、笠松直史、加田智之、海津利行、喜多隆


• Jun. 2014 40th IEEE Photovoltaic Special Conference, PVSC40 Best Student Paper Award, Carrier Time-of-Flight Measurement Using a Probe Structure for DirectEvaluation of Carrier Transport in Quantum Structure Solar Cells

  Kasidit Toprasertpong, Naofumi Kasamatsu, Hiromasa Fujii, Tomoyuki Kada,Shigeo Asahi, Yunpeng Wang, Kentaroh Watanabe, Masakazu Sugiyama, TakashiKita, Yoshiaki Nakano


• Mar. 2014 第36回（2014年春季）応用物理学会, 応用物理学会講演奨励賞, プローブ構造を用いた量子構造太陽電池におけるキャリア走行時間の測定” トープラサートポン カシディット

  笠松直史、藤井宏昌、加田智之、朝日重雄、王云鵬、渡辺健太郎、杉山正和、喜多隆、中野義昭


• Dec. 2011 The 18th International Display Workshops, IDW'11 Outstanding Poster Paper Award, Effects of Argon Plasma Irradiation on Amorphous In-Ga-Zu-Ofilm Evaluated by Microwave Photoconductivity Decay Method

  S Yasuno, T Kita, S Morita, K Hayashi, T Kugimiya, S Sumie


• Dec. 2010 第21回光物性研究会, 第21回光物性研究会奨励賞, 希土類化合物半導体GdNにおけるバンド端光吸収の磁気光学特性

  H Yoshitomo, S Kitayama, T Kita, M Fujisawa, H Ohta


• Oct. 2010 6th Intｅrnational Workshop on Nano-Scale Spectroscopy \Nanotechnology, NSS6 Student Award, Band-Edge Structure Induced by Ferromagnetic Spin Ordering in GdN Thin Films

  H Yoshitomo, S Kitayama, T Kita, M Fujisawa, H Ohta


• Dec. 2009 日本材料学会半導体エレクトロニクス部門委員会, 日本材料学会半導体エレクトロニクス部門学生優秀講演賞, 希土類窒化物半導体GdNヘテロ構造の基礎物性

  吉富 大明, 來山 真也, 喜多 隆, 和田 修, 藤澤 真士, 太田 仁


• Mar. 2009 財団法人エレクトロニクス実装学会, 第22回エレクトロニクス実装学会学術講演会優秀講演賞, 周期加熱サーモリフレクタンス法による銅めっき膜の熱伝導率評価

  三宅 修吾, 喜多 隆, 三宅 綾, 池田 健一, 高松 弘行


• Dec. 2008 8th International Conference on Nano-Molecular Electronics 2008, ICNME2008 Outstanding Poster Presentation Award, Side Electron Emission Device Using A Composite of Carbon Nanofibers and Aluminum

  H Tanaka, H Nakamura, H Yanagi, T Kita, K Yokoyama, A Magario, T Noguchi


• Jul. 2008 ICOOPMA組織委員会, Best Poster Award, Lengthening of photoluminescence decay time owing to expansion of electron envelope functions in stacked quantum dots

  Osamu Kojima, Hiroaki Nakatani, Takashi Kita, Osamu Wada, Kouichi Akahane, Masahiro Tsuchiya


• Apr. 2008 電気関係学会関西支部連合大会実行委員会, 平成19年電気関係学会関西支部連合大会奨励賞, コラムナ量子ドットによる広帯域発光特性制御

  岸本一正、井上知也、喜多隆、和田修


• Sep. 2007 応用物理学会, 応用物理学会講演奨励賞, InAs/GaAs量子ドット自己形成過程のRHEEDシェブロン構造のその場解析とIn拡散効果

  Kudo Takuya, Inoue Tomoya, Kita Takashi, Wada Osamu


• Mar. 2007 日本金属学会, 金属学会写真奨励賞, 単一量子ドットの三次元微細構造解析

  Konnno Mitsuru, Yaguchi Toshie, Kamino Takeo, Watanabe Akira, Kita Takasi, Inoue Tomoya


• Nov. 2006 第67回応用物理学会学術講演会, 応用物理学会講演奨励賞, 高分解能断面TEMによる埋め込み量子ドット形状のマルチアングル直接観測

  井上知也, 喜多隆, 和田修, 今野充, 矢口紀恵, 上野武夫


• May 2005 神戸大学, 神戸大学工学部優秀教育賞

  喜多隆


• Nov. 2004 はりま産学交流会主催, シーズコンペ入賞, 超省電力次世代ディスプレイ材料の開発

  喜多隆


• Sep. 2000 第46回応用物理学関係連合講演会, 応用物理学会講演奨励賞, Ga0.5In0.5P/GaAsヘテロ界面における自然超格子の影響 - 偏光ラマンスペクトル -

  山下兼一, 喜多隆, 西野種夫, 王勇, 邑瀬和生, C. Geng, F. Scholz, H. Schweizer


• Sep. 1999 第60回応用物理学会学術講演会, 応用物理学会講演奨励賞, 反射率差分光法によるInAs自己形成量子ドット成長表面の観察

  立川功二、丹後秀樹、喜多隆、山下兼一、西野種夫


• Jul. 1998 電子材料シンポジウム運営委員会, EMS賞, Time-Resolved Up-Converted Photoluminescence at Semicoductor Heterointerface

  K. Yamashita, T. Kita, H. Nakayama, and T. Nishino


• Jul. 1995 The Material Research Society of Japan, 日本MRS若手研究者アワード, AlGaInP混晶半導体自然超格子の電子状態制御

  喜多隆, 西野種夫

• Photo-Hall effect characterization and terahertz wave generation with 1550 nm excitation in InAs/GaAs quantum dot superlattice based photoconductive antenna

  Yasuo Minami, Ayumi Simmen, Takahiro Kitada, Yukihiro Harada, Toshiyuki Kaizu, Osamu Kojima, Takashi Kita, Osamu Wada

  The basic photoconductive properties of an InAs/GaAs quantum dot (QD) superlattice have been characterized to develop photoconductive antennas (PCAs) operating with a telecom wavelength excitation for practical terahertz (THz) systems. The multiple-stacked InAs/GaAs QD structure was grown by molecular beam epitaxy and photo-Hall effect measurements were performed under infrared illumination conditions using light-emitting diodes with different emission wavelengths. The results have shown that sign reversal occurs in the Hall coefficient (RH) as the illumination wavelength changes: RH is negative at 940 nm and positive at 1550 nm. The photocurrent at 940 nm illumination is ascribed to the electron hole pair generation in QDs, whereas the photocurrent at 1550 nm is dominated by the hole current generated through the midgap states in the structure. The hole dominant photocurrent has been interpreted by a model in which photogenerated electrons are trapped in QDs and the number of mobile electrons are reduced. High dark resistance of the present QD superlattice material provides an advantage for the application to PCA devices. THz wave generation has been demonstrated by the ultrafast 1550 nm pulse excitation of a PCA device fabricated from the QD superlattice.

  AIP Publishing, Jun. 2025, Journal of Applied Physics, 137(21) (21)

  Scientific journal


• Output power-density limit of a thermoradiative diode with an intermediate band

  Yukihiro Harada, Fuka Nishii, Takashi Kita

  Abstract The application of the thermoradiative effect of photodiodes, in which photons are emitted to a cold reservoir in the far-field, is a promising approach for renewable electricity generation. Here we derive the radiative limit of the output power density of an ideal thermoradiative diode (TRD) with an intermediate band (IB) using detailed balance calculations. The output power density of an ideal IB-TRD with a given bandgap energy and an optimal IB position increases with the device temperature, and simultaneously the optimal position of the IB shifts away from the mid-gap position due to the current matching constraint. Since the intrinsic carrier density needs to be significantly lower than the doping concentration to form a p–n junction at the operating temperature, IB-TRDs can be advantageous compared to single-junction TRDs consisting of narrow-bandgap semiconductors.

  Springer Science and Business Media LLC, Mar. 2025, Scientific Reports, 15(1) (1)

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Nonlinear photoexcitation processes at a MAPbBr3/GaAs heterointerface

  Hambalee Mahamu, Matthias Bourzier, Shigeo Asahi, Takashi Kita

  Abstract While a significant part of the solar energy lies in the infrared range, common semiconductors cannot absorb this part of the solar irradiance by direct band-to-band transitions, because the corresponding photon energies are below the bandgap energy. Two-step photon up-conversion (TPU) is one of the processes that allows us to harvest energy in the region below the bandgap, and one possible approach to realize a TPU-based solar cell is to use an AlGaAs/GaAs heterointerface with quantum dots in order to induce additional intraband transitions. On the other hand, here we report on the TPU phenomenon at a methylammonium lead bromide/gallium arsenide (MAPbBr₃/GaAs) heterointerface without quantum dots. For this heterojunction, we observed high-energy photoemission by low-energy photoinjection, demonstrating the TPU. By using photoluminescence (PL) and time-resolved PL measurement techniques, we elucidate the mechanism of the PL emission from MAPbBr₃ observed from MAPbBr₃/GaAs samples. Through the comparisons of the experimental PL and TRPL results between the MAPbBr₃/GaAs and MAPbBr₃/Glass-substrate samples, we successfully distinguish the TPU phenomenon from the ordinal two-photon absorption of MAPbBr₃. Our findings in the TPU at the MAPbBr₃/GaAs heterointerface may help to realize quantum-dot-free photon up-conversion solar cells.

  Springer Science and Business Media LLC, Jan. 2025, Journal of Optics, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• The basic monochromatic photovoltaic properties of a photodiode for laser power conversion

  Ryota Hanakuma, Shigeo Asahi, Yukihiro Harada, Takashi Kita

  Abstract We studied the photovoltaic properties of a conventional silicon photodiode under monochromatic illumination conditions to clarify the loss mechanisms that are important for application as a laser power converter. While the short-circuit current increases linearly with the excitation power, the power dependence of the open-circuit voltage consists of two regions with different slopes as a result of the Joule heating. At higher excitation power densities, thermal effects play a key role in the current–voltage characteristics, and therefore the maximum conversion efficiency is achieved at a certain excitation-power density. Furthermore, the optimum excitation wavelength shifts towards longer wavelengths as the excitation power density increases, because the optimum value is determined by a trade-off between the optical absorption strength and the excitation power density.

  IOP Publishing, Jan. 2025, Japanese Journal of Applied Physics, 64(1) (1), 014001 - 014001, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Conduction Band Resonant State Absorption for Quantum Dot Infrared Detectors Operating at Room Temperature

  Stefano Vichi, Shigeo Asahi, Sergio Bietti, Artur Tuktamyshev, Alexey Fedorov, Takashi Kita, Stefano Sanguinetti

  American Chemical Society (ACS), Dec. 2024, ACS Photonics, 12(1) (1), 447 - 456

  Scientific journal


• Intraband transitions at a CsPbBr3/GaAs heterointerface in a two-step photon upconversion solar cell

  Hambalee Mahamu, Shigeo Asahi, Takashi Kita

  Abstract Two-step photon upconversion solar cells (TPU-SCs) based on III–V semiconductors can achieve enhanced sub-bandgap photon absorption because of intraband transitions at the heterointerface. From a technological aspect, the question arose whether similar intraband transitions can be realized by using perovskite/III–V semiconductor heterointerfaces. In this article, we demonstrate a TPU-SC based on a CsPbBr₃/GaAs heterointerface. Such a solar cell can ideally achieve an energy conversion efficiency of 48.5% under 1-sun illumination. This is 2.1% higher than the theoretical efficiency of an Al_0.3Ga_0.7As/GaAs-based TPU-SC. Experimental results of the CsPbBr₃/GaAs-based TPU-SC show that both the short-circuit current J_SC and the open-circuit voltage V_OC increase with additional illumination of sub-bandgap photons. We analyze the excitation power dependence of J_SC for different excitation conditions to discuss the mechanisms behind the enhancement. In addition, the observed voltage-boost clarifies that the J_SC enhancement is caused by an adiabatic optical process at the CsPbBr₃/GaAs heterointerface, where sub-bandgap photons efficiently pump the electrons accumulated at the heterointerface to the conduction band of CsPbBr₃. Besides the exceptional optoelectronic properties of CsPbBr₃ and GaAs, the availability of a CsPbBr₃/GaAs heterointerface for two-step photon upconversion paves the way for the development of high-efficiency perovskite/III–V semiconductor-based single-junction solar cells.

  Springer Science and Business Media LLC, Nov. 2024, Scientific Reports, 14(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Lateral photoconductivity of InAs/GaAs quantum dots for 1.5 μm-wavelength excitation photoconductive terahertz antenna devices

  Toshiyuki Kaizu, Osamu Kojima, Yasuo Minami, Takahiro Kitada, Yukihiro Harada, Takashi Kita, Osamu Wada

  Abstract We report lateral photoconductive properties of multilayer-stacked undoped InAs/GaAs quantum dots (QDs) for the application of photoconductive terahertz (THz) antenna devices that operate in a 1.5 μm-telecom-wavelength band. The excitation power-dependent photocurrent showed a high value without saturation under high excitation power for the excitation wavelength of 1460 nm. From the reflection pump-probe signal, a fast photocarrier lifetime was derived. These results, together with the low dark current characteristic, support the applicability of the multilayer-stacked undoped InAs/GaAs QDs to photoconductive THz antennas operating in a 1.5 μm-wavelength band.

  IOP Publishing, Aug. 2024, Japanese Journal of Applied Physics, 63(8) (8), 082002 - 082002

  Scientific journal


• Electric Field Enhancement Effect by Localized Surface Plasmon Resonance in Heavily-Doped InAs/GaAs Quantum Dots

  Mizuto KAWAKAMI, Yukihiro HARADA, Shigeo ASAHI, Takashi KITA

  Society of Materials Science, Japan, Feb. 2024, Journal of the Society of Materials Science, Japan, 73(2) (2), 178 - 182, Japanese

  [Refereed]

  Scientific journal


• 量子ドットを内包するヘテロ界面を利用した2段階フォトンアップコンバージョン太陽電池

  朝日重雄, 原田幸弘, 喜多隆

  公益社団法人応用物理学会, Sep. 2023, 応用物理, 92(9) (9), 550 - 554, Japanese

  [Refereed]


• Characteristics of ultrafast response induced by impulsive interference of excitons in a GaAs/AlAs multiple quantum well on a slightly strained buffer layer

  Osamu Kojima, Ikuo Tamachii, Takashi Kita

  Abstract Ultrafast responses caused by ultrashort pulse excitation can be applied to ultrafast optical switches with high-speed information processing. In this paper, via the impulsive interference of excitons, we achieve an ultrafast optical response suited for ultrafast switches in all-optical networks. Due to the simultaneous excitation of two exciton states in the multiple quantum well on a strained buffer layer without the occurrence of adverse effects like stacking faults, impulsive interference is induced. The small compressive strain from the buffer layer modifies the orientation of the excitons inside the quantum well, and causes the ultrafast response.

  IOP Publishing, Jun. 2023, Applied Physics Express, 16(6) (6), 062009 - 062009, English

  Scientific journal


• Multi-step photon upconversion in quantum-dot-based solar cells with a double-heterointerface structure

  Hambalee Mahamu, Shigeo Asahi, Takashi Kita

  Photon upconversion (PU) is a process where an electron is excited from the valence band to the conduction band of a wide-gap semiconductor by the sequential absorption of two or more photons via real states. For example, two-step PU can generate additional photocurrent in the so-called intermediate-band solar cells. In this work, we consider two- and three-step processes; we study multi-step PU in a quantum dot (QD)-based single-junction solar cell with a double-heterointerface structure. The solar cell consists of three different absorber layers: Al_0.7Ga_0.3As, Al_0.3Ga_0.7As, and GaAs, which form two heterointerfaces. Just beneath each heterointerface, an InAs/GaAs QD layer was inserted. After band-to-band excitation, electrons accumulate at each heterointerface, and then, below-bandgap photons excite a certain fraction of these electrons above the barrier energy. The photoluminescence spectra of the InAs QDs reveal slightly different QD size distributions at the two heterointerfaces. We show that the external quantum efficiency is improved by additional irradiation with below-bandgap infrared photons, which suggests a multi-step PU process that involves the two heterointerfaces. The dependence of the photocurrent on the infrared excitation power density only shows a superlinear behavior when the GaAs layer is excited but the Al_0.3Ga_0.7As layer is not. These data demonstrate a multi-step PU process that consists of one intraband transition at each of the two heterointerfaces and one interband transition in GaAs.

  AIP Publishing, Mar. 2023, Journal of Applied Physics, 133(12) (12), 124503 - 124503, English

  [Refereed]

  Scientific journal


• Diffusion photocurrent influenced by intraband excitation in an intermediate band solar cell with type-I band alignment

  Yaxing Zhu, Shigeo Asahi, Naoya Miyashita, Yoshitaka Okada, Takashi Kita

  Abstract We elucidate a photocarrier collection mechanism in intermediate band solar cells (IBSCs) with InAs-quantum dots (QDs)-in-an-Al_0.3Ga_0.7As/GaAs-quantum well structures. When the Al_0.3Ga_0.7As barrier is excited, the device electrical output can be varied by additional infrared light for the electron intraband optical transition in QDs. The photocurrent in IBSC with a single QDs-in-a-well structure shows a monotonic increase with the intraband-excitation density. Conversely, IBSC with a multilayered QDs-in-a-well structure exhibits a photocurrent reduction when electrons in QDs are optically pumped out. The simultaneously measured photoluminescence spectra proved that the polarity of QD states changes depending on the intraband-excitation density. We discuss the drift and diffusion current components and point out that the hole diffusion current is significantly influenced by carriers inside the confinement structure. Under strong intraband excitations, we consider an increased hole diffusion current occurs by blocking hole-capture in the quantum structures. This causes unexpected photocurrent reduction in the multilayered device.

  IOP Publishing, Jul. 2022, Japanese Journal of Applied Physics, 61(7) (7), 074002 - 074002

  [Refereed]

  Scientific journal


• Increase in terahertz-wave intensity in a magnetic field due to difference-frequency mixing by exciton excitation in a GaAs/AlAs multiple quantum well

  Osamu Kojima, Yuki Tarui, Takashi Kita, Avan Majeed, Pavlo Ivanov, Edmund Clarke, Richard A. Hogg

  Optica Publishing Group, Mar. 2022, Optics Express, 30(7) (7), 11789 - 11789, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Yb-doped Y–Al–O thin films with a self-organized columnar structure and their anti-Stokes photoluminescence properties

  Y. Nakayama, N. Nakagawa, Y. Matsuo, T. Kaizu, Y. Harada, T. Ishihara, T. Kita

  AIP Publishing, Feb. 2022, AIP Advances, 12(2) (2), 025110 - 025110

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 紫外光によるウイルスの不活化と実証実験

  喜多 隆

  Lead, Jan. 2022, Chemistry＆Chemical Industry（化学と工業）, 75(1) (1), 26 - 28, Japanese

  [Invited]

  Scientific journal


• Erratum: Two-photon photocurrent spectra of InAs quantum dot-in-well intermediated-band solar cells at room temperature (Journal of Applied Physics (2021) 130 (124505) DOI: 10.1063/5.0060569)

  Yaxing Zhu, Shigeo Asahi, Naoya Miyashita, Yoshitaka Okada, Takashi Kita

  American Institute of Physics Inc., Nov. 2021, Journal of Applied Physics, 130(17) (17), English

  Scientific journal


• Two-photon photocurrent spectra of InAs quantum dot-in-well intermediated-band solar cells at room temperature

  Yaxing Zhu, Shigeo Asahi, Naoya Miyashita, Yoshitaka Okada, Takashi Kita

  AIP Publishing, Sep. 2021, Journal of Applied Physics, 130(12) (12), 124505 - 124505

  [Refereed]

  Scientific journal


• Voltage boost effects in two-step photon upconversion solar cells with a modulation-doped structure

  Kohei Watanabe, Shigeo Asahi, Yaxing Zhu, Takashi Kita

  AIP Publishing, Aug. 2021, Journal of Applied Physics, 130(8) (8), 085701 - 085701, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Modulation of exciton states through resonant excitation by continuous wave lasers in a GaAs/AlAs multiple quantum well

  Osamu Kojima, Takashi Kita, Matthew J Steer, Richard A Hogg

  IOP Publishing, Aug. 2021, Journal of Physics D: Applied Physics, 54(33) (33), 335106 - 335106

  [Refereed]

  Scientific journal


• Increase in terahertz-wave generation by difference frequency mixing by the overlap of exciton states in different GaAs/AlAs quantum wells and spectroscopic measurements

  Kanta Sakaue, Osamu Kojima, Takashi Kita, Matthew J. Steer, Richard A. Hogg

  The Optical Society, Jul. 2021, Optics Express, 29(15) (15), 24387 - 24387

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Collection of Photocarriers Varied by Effective Electron Intraband Excitation in an InAs Quantum Dot-in-Well Intermediate Band Solar Cell

  Yaxing Zhu, Shigeo Asahi, Takashi Kita

  Institute of Electrical and Electronics Engineers Inc., Jun. 2021, Conference Record of the IEEE Photovoltaic Specialists Conference, 1786 - 1788, English

  International conference proceedings


• 解説：希土類イオンを利用した水銀フリ－ナロ－バンド紫外光源

  喜多 隆

  May 2021, KOGAKU Japanese Journal of Optics, 50(10) (10), 432 - 437

  [Refereed]


• Yb-doped yttrium aluminum perovskite for radiation balanced laser application

  Yuta Nakayama, Yukihiro Harada, Takashi KIta

  SPIE, Apr. 2021, Photonic Heat Engines: Science and Applications III

  [Refereed]

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• Two-step excitation induced photovoltaic properties in an InAs quantum dot-in-well intermediate-band solar cell

  Yaxing Zhu, Shigeo Asahi, Kohei Watanabe, Naoya Miyashita, Yoshitaka Okada, Takashi Kita

  AIP Publishing, Feb. 2021, Journal of Applied Physics, 129(7) (7), 074503 - 074503, English

  [Refereed]

  Scientific journal


• Properties of Anti-Stokes Photoluminescence and Ideal Laser Cooling Performance in Yb-DopednYttrium Aluminum Garnet Thin Film

  Y.Nakayama, N.Nakagawa, Y.Harada, T.Kita

  Society of Materials Science, Japan, Oct. 2020, Journal of the society of Materials Science,Japan, 69(10) (10), 727 - 732, Japanese

  [Refereed]

  Scientific journal


• Resonant exciton excitation photoluminescence and dynamics in a GaAs/AlAs multiple quantum well with internal electric field

  Osamu Kojima, Takashi Kita, Matthew J. Steer, Richard A. Hogg

  {AIP} Publishing, Sep. 2020, AIP Advances, 10(9) (9), 095016 - 095016, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Electron transport in a silicon crystal observed by energy transfer luminescence

  Osamu Kojima, Yukako Ito, Takashi Kita, Yong-Gu Shim

  IOP Publishing, Aug. 2020, Japanese Journal of Applied Physics, 59(8) (8), 082005 - 082005, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Reciprocal Relation Between Intraband Carrier Generation and Interband Recombination at the Heterointerface of Two-Step Photon Up-Conversion Solar Cells

  Noriyuki Kinugawa, Shigeo Asahi, Takashi Kita

  American Physical Society (APS), Jul. 2020, Physical Review Applied, 14(1) (1), 014010-1 - -7, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• An Energy Transfer Accompanied by Phonon Absorption in Ytterbium-Doped Yttrium Aluminum Perovskite for Optical Refrigeration

  Y. Nakayama, Y. Harada, T. Kita

  Jul. 2020, Applied Physics Letters, 117(041104) (041104), 1 - 5, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Infrared photodetector sensitized by InAs quantum dots embedded near an Al0.3Ga0.7As/GaAs heterointerface

  Takahiko Murata, Shigeo Asahi, Stefano Sanguinetti, Takashi Kita

  Springer Science and Business Media LLC, Jul. 2020, Scientific Reports, 10(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Intensive-Light-Induced Backtracking Voltage Phenomenon: An Insight into Intermediate-Band Solar Cell Output Performance

  Yaxing Zhu, Shigeo Asahi, Takashi Kita

  Institute of Electrical and Electronics Engineers Inc., Jun. 2020, Conference Record of the IEEE Photovoltaic Specialists Conference, 2020-, 0146 - 0148, English

  International conference proceedings


• Up-converted photocurrent enhancement in modulation-doped two-step photon up-conversion solar cells

  Kohei Watanabe, Shigeo Asahi, Yaxing Zhu, Takashi Kita

  Institute of Electrical and Electronics Engineers Inc., Jun. 2020, Conference Record of the IEEE Photovoltaic Specialists Conference, 2020-, 0902 - 0904, English

  International conference proceedings


• Determination of silicon wafer site flatness using dual heterodyne interferometers with sub-nanometer precision

  Kazuhiko Tahara, Hideki Matsuoka, Noritaka Morioka, Hidetoshi Tsunaki, Masato Kannaka, Takashi Kita

  AIP Publishing, Jun. 2020, Review of Scientific Instruments, 91(6) (6), 065114 - 065114, English

  [Refereed]

  Scientific journal


• Enhancement of laser cooling efficiency in rare-earth-doped oxide at elevated high temperature

  Yuta Nakayama, Yukihiro Harada, Takashi Kita

  SPIE, Feb. 2020, Photonic Heat Engines: Science and Applications II, 11298, 112980B-1 - 10, English

  [Refereed]

  International conference proceedings


• Polarization-insensitive Fiber-to-Fiber Gain of Semiconductor Optical Amplifier Using Closely Stacked InAs/GaAs Quantum Dots

  T. Kaizu, T. Kakutani, K. Akahane, and T. Kita

  Feb. 2020, Jpn. J. Appl. Phys., 59, 032002-1 - 5, English

  [Refereed]

  Scientific journal


• Bound-to-continuum intraband transition properties in InAs/GaAs quantum dot superlattice solar cells

  Yukihiro Harada, Shigeo Asahi, Takashi Kita

  IOP Publishing, Dec. 2019, Applied Physics Express, 12(12) (12), 125008 - 125008, English

  [Refereed]

  Scientific journal


• Improving laser cooling efficiencies of Yb-doped yttrium aluminum garnet by utilizing non-resonant anti-Stokes emission at high temperatures

  Yuta Nakayama, Yukihiro Harada, Takashi Kita

  The Optical Society, Nov. 2019, Optics Express, 27(24) (24), 34961 - 34961, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Ideal Laser Cooling Efficiency Utilizing Anti-Stokes Luminescence in Yb-Doped Yttrium Aluminum Garnet Powder Crystals

  Yuta NAKAYAMA, Kota TERADA, Yukihiro HARADA, Takashi KITA

  Society of Materials Science, Japan, Oct. 2019, Journal of the Society of Materials Science, Japan, 68(10) (10), 762 - 766

  [Refereed]

  Scientific journal


• Yｂ添加イットリウムアルミニウムガーネット結晶粉末におけるアンチストークス発光を利用した理想レーザー冷却効率

  中山雄太、寺田康太、原田幸弘、喜多隆

  Oct. 2019, 材料 別冊, 68(10) (10), 762 - 766, Japanese

  [Refereed]

  Scientific journal


• 金属上に形成した2次元フォトニック結晶の光学応答

  牟田啓太郎、喜多隆

  Oct. 2019, 材料 別冊, 68(10) (10), 757 - 761, Japanese

  [Refereed]

  Scientific journal


• 加速度計により振動の影響を低減したサブナノメートル精度ウエハフラットネス計測システム

  原和彦、網木英俊、森岡哲隆、松岡英毅、甘中将人、喜多隆

  Oct. 2019, 材料 別冊, 68(10) (10), 767 - 771, Japanese

  [Refereed]

  Scientific journal


• Photoelectrochemical Reaction in an Electric Cell with a Porous Carbon Anode

  Toshiyuki Kaizu, Yousuke Kawajiri, Masahito Enomoto, Takashi Uchino, Minoru Mizuhata, Yuichi Ichihashi, Keita Taniya, Satoru Nishiyama, Masakazu Sugiyama, Masami Ueno, Takashi Kita

  American Chemical Society (ACS), Aug. 2019, J. Phys. Chem, 123(32) (32), 19447 - 19452

  [Refereed]

  Scientific journal


• Hot-Carrier Generation and Extraction in InAs/GaAs Quantum Dot Superlattice Solar Cells

  Yukihiro Harada, Naoto Iwata, Shigeo Asahi, Takashi Kita

  IOP Publishing, Aug. 2019, Semiconductor Science and Technology, 34(9) (9), 094003 - 1-5, English

  [Refereed]

  Scientific journal


• Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches

  KOJIMA OSAMU, Nagauchi Junpei, KITA TAKASHI

  AIP Publishing, Jul. 2019, Journal of Applied Physics, 126, 033103 - 1-6, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Wide-wavelength-range control of photoluminescence polarization in closely stacked inas/gaas quantum dots

  Toshiyuki Kaizu, Yusuke Tajiri, Takashi Kita

  American Institute of Physics Inc., Jun. 2019, Journal of Applied Physics, 125(23) (23), English

  Scientific journal


• Reciprocal relationship between photoluminescence and photocurrent in two-step photon up-conversion solar cell

  Noriyuki Kinugawa, Shigeo Asahi, Takashi Kita

  Institute of Electrical and Electronics Engineers Inc., Jun. 2019, Conference Record of the IEEE Photovoltaic Specialists Conference, 2623 - 2626, English

  International conference proceedings


• Strong voltage-boost effect in two-step photon-up conversion solar cells

  Shigeo Asahi, Takashi Kita

  Institute of Electrical and Electronics Engineers Inc., Jun. 2019, Conference Record of the IEEE Photovoltaic Specialists Conference, 2597 - 2599, English

  International conference proceedings


• Hot-Carrier Extraction in InAs/GaAs Quantum Dot Superlattice Solar Cells

  Yukihiro Harada, Naoto Iwata, Daiki Watanabe, Shigeo Asahi, Takashi Kita

  Institute of Electrical and Electronics Engineers Inc., Jun. 2019, Conference Record of the IEEE Photovoltaic Specialists Conference, 3004 - 3006, English

  International conference proceedings


• Effect of modulation of ultrafast transient carrier dynamics by interface on terahertz signal

  Shintaro Yamamoto, KOJIMA OSAMU, KITA TAKASHI

  Institute of Physics, May 2019, Journal of Physics: Conference Series, 1220, 012013 - 1-4, English

  [Refereed]

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• Adiabatic two-step photoexcitation effects in intermediate-band solar cells with quantum dot-in-well structure

  ASAHI SHIGEO, KAIZU TOSHIYUKI, KITA TAKASHI

  We studied the dynamics of electrons generated by two-step photoexcitation in an intermediate-band solar cell (IBSC) comprising InAs/GaAs/Al0.3Ga0.7As dot-in-well (DWELL) structure using time-resolved photocurrent (TRPC) measurement. The examined IBSC exhibited considerably slower photocurrent decay than a conventional InAs/GaAs quantum dot IBSC, which is due to the extraordina

  Nature Publishing Group, May 2019, Scientific Reports, 9, 7859 - 1-8, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of a thin nitrogen-doped layer on terahertz dynamics in GaAs containing InAs quantum dots

  KOJIMA OSAMU, Ryo Izumi, KITA TAKASHI

  OSA Publishing, Apr. 2019, OSA Continuum, 2, 1621 - 1628, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Luminescence study of Si/SiC nano-particles embedded in SiOx Cy matrix deposited using O-Cat-CVD

  Y. Matsumoto, S. Asahi, T. Kita, Santovo-Salazar, C. Ramos, B. Verma, J.R.Ramos-Serrano, S. Godavarthi, G. Santana, A. Dutt

  Mar. 2019, Physica E: Low-dimensional Systems and Nanostructures, 111, 179 - 184, English

  [Refereed]

  Scientific journal


• Reply to: Thermal Artefacts in Two-Photon Solar Cell Experiments

  ASAHI SHIGEO, KITA TAKASHI

  Nature Publishing Group, Feb. 2019, Nature Communications, 10, 956 - 1-3, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Wafer flatness measurement system with sub-nanometer precision cancelling the mechanical vibration using accelerometers

  Kazuhiko Tahara, Hidetoshi Tsunaki, Noritaka Morioka, Hideki Matsuoka, Masato Kannaka, Takashi Kita

  Society of Materials Science Japan, 2019, Zairyo/Journal of the Society of Materials Science, Japan, 68(10) (10), 767 - 771, Japanese

  Scientific journal


• The Conversion Efficiency of a Solar Cell as Determined by the Detailed Balance Model

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Verlag, 2019, Green Energy and Technology, 55 - 79, English

  In book


• Actual Calculation of Solar Cell Efficiencies

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Verlag, 2019, Green Energy and Technology, 81 - 137, English

  In book


• Photons from the Sun

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Verlag, 2019, Green Energy and Technology, 15 - 24, English

  In book


• Fundamentals of Semiconductors

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Verlag, 2019, Green Energy and Technology, 157 - 202, English

  In book


• Application Limits for the Ideal Conditions

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Verlag, 2019, Green Energy and Technology, 139 - 156, English

  In book


• “Graphical Solution” for the Solar Cell Conversion Efficiency in the Completely Ideal Case

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Verlag, 2019, Green Energy and Technology, 25 - 42, English

  In book


• Influences of Carrier Generation and Recombination on the Solar Cell Conversion Efficiency

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Verlag, 2019, Green Energy and Technology, 43 - 54, English

  In book


• The Solar Cell and the Electrochemical Cell

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Verlag, 2019, Green Energy and Technology, 1 - 13, English

  In book


• Energy Conversion Efficiency of Solar Cells

  Takashi Kita, Yukihiro Harada, Shigeo Asahi

  Springer Singapore, 2019, Green Energy and Technology

  [Refereed]


• Increasing conversion efficiency of two-step photon up-conversion solar cell with a voltage booster hetero-interface

  Shigeo Asahi, Kazuki Kusaki, Yukihiro Harada, Takashi Kita

  Nature Publishing Group, Dec. 2018, Scientific Reports, 8(1) (1), pp. 872 - 1-8, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Carrier collection efficiency of intraband-excited carriers in two-step photon up-conversion solar cells

  Shigeo Asahi, Kenta Nishimura, Toshiyuki Kaizu, Takashi Kita

  Institute of Electrical and Electronics Engineers Inc., Nov. 2018, 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC, 3447 - 3450, English

  International conference proceedings


• Optimal band gap energies for two-step photon up-conversion solar cells with partial absorptivity

  Y. Harada, T. Matsuo, S. Asahi, T. Kita

  Nov. 2018, Proceedings of the 35th European Photovoltaic Solar Energy Conference and Exhibition, 126 - 128, English

  [Refereed]

  International conference proceedings


• Wide Frequency Tuning of Continuous Terahertz Wave Generated by Difference Frequency Mixing under Exciton-Excitation Conditions in a GaAs/AlAs Multiple Quantum Well

  OSAMU KOJIMA, YUKI TARUI, HIDEKI SHIMAZU, KITA TAKASHI, AVAN MAJEED, PAVIO IVANOV, EDMUND CIARKE, RICHARD HOGG

  Oct. 2018, Physical Review Applied, A 10(044035) (044035), pp. 044035 - 1-6, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Wafer flatness measurement system with sub-nanometer precision cancelling the noise caused by a light source using dual heterodyne interferometer

  Kazuhiko Tahara, Hideki Matsuoka, Masato Kannaka, Takashi Kita

  Society of Materials Science Japan, Sep. 2018, Zairyo/Journal of the Society of Materials Science, Japan, 67(9) (9), 829 - 833, Japanese

  Scientific journal


• デュアルヘテロダイン干渉計により光源起因のノイズを低減したサブナノメートル精度ウエハフラットネス計測システム

  KAZUHIKO TAHARA, HIDEKI MATSUOKA, KANNAKA KASATO, KITA TAKASHI

  Sep. 2018, 材料 別冊, Vol. 67(No. 9) (No. 9), pp. 829 - 833, Japanese

  [Refereed]

  Scientific journal


• Hot-Carrier Generation in a Solar Cell Containing InAs/GaAs Quantum-Dot Superlattices as a Light Absorber

  DAIKI WATANABE, NAOTO IWATA, SHIGEO ASAHI, YUKIHIRO HARADA, KITA TAKASHI

  Jul. 2018, Applied Physics Express, Vol. 11(No. 1) (No. 1), pp.082303 - 1-4, English

  [Refereed]

  Scientific journal


• Effect of lattice-mismatch strain on electron dynamics in InAs/GaAs quantum dots as seen by time-domain terahertz spectroscopy

  KOJIMA OSAMU, Ryo Izumi, KITA TAKASHI

  Institute of Physics, Jul. 2018, Journal of Physics D: Applied Physics, 51, 305102 - 1-6, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 高変換効率太陽光発電の研究開発～50%を超える変換効率実現に向けた取り組み

  KITA TAKASHI

  Corresponding, Jun. 2018, 電気評論, (6月号) (6月号), 13 - 17, Japanese

  [Refereed]


• Demonstration of 1-μm-band Si-photonics-based quantum dot heterogeneous tunable laser

  A. Matsumoto, K. Akahane, T. Umezawa, N. Yamamoto, H. Yamada, T. Kita

  OSA - The Optical Society, 2018, Optics InfoBase Conference Papers, 2018, English

  [Refereed]

  International conference proceedings


• Two-step photon up-conversion solar cell: Propose and demonstration

  S. Asahi, T. Kita

  SPIE, 2018, Proceedings of SPIE - The International Society for Optical Engineering, 10527, English

  [Refereed]

  International conference proceedings


• Two-step photocurrent generation enhanced by the fundamental-state miniband formation in intermediate-band solar cells using a highly homogeneous InAs/GaAs quantum-dot superlattice

  Kazuki Hirao, Shigeo Asahi, Toshiyuki Kaizu, Takashi Kita

  Jan. 2018, APPLIED PHYSICS EXPRESS, 11(1) (1), pp. 012301 - 1-4, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Spatially resolved electronic structure of an isovalent nitrogen center in GaAs

  R. C. Plantenga, V. R. Kortan, T. Kaizu, Y. Harada, T. Kita, M. E. Flatte, P. M. Koenraad

  Oct. 2017, PHYSICAL REVIEW B, 96(15) (15), pp. 155210 - 1-8, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Fundamental device characteristics of hot carrier solar cell using InAs/GaAs quantum dot superlattices

  Daiki Watanabe, Yukihiro Harada, Takashi Kita

  Society of Materials Science Japan, Sep. 2017, Zairyo/Journal of the Society of Materials Science, Japan, 66(9) (9), 629 - 633, Japanese

  [Refereed]

  Scientific journal


• Excitation of Thin Cyanine Films via Energy Transfer from Si Substrate

  Yukako Ito, Osamu Kojima, Takashi Kita, YongGu Shim

  Sep. 2017, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 86(9) (9), pp. 094710 - 1-4, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• InAs/GaAs量子ドット超格子を用いたホットキャリア型太陽電池の基礎特性

  渡部 大樹, HARADA YUKIHIRO, KITA TAKASHI

  Sep. 2017, 材料 別冊, 66(9) (9), pp. 629 - 633, Japanese

  [Refereed]

  Scientific journal


• Efficient two-step photocarrier generation in bias-controlled InAs/GaAs quantum dot superlattice intermediate-band solar cells

  T. Kada, S. Asahi, T. Kaizu, Y. Harada, R. Tamaki, Y. Okada, T. Kita

  Jul. 2017, SCIENTIFIC REPORTS, 7, pp. 5865 - 1-10, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Ferromagnetic resonance features of degenerate GdN semiconductor

  Reddithota Vidyasagar, Takashi Kita, Takahiro Sakurai, Tokuro Shimokawa, Hitoshi Ohta

  Jun. 2017, PHYSICS LETTERS A, 381(22) (22), 1905 - 1909, English

  [Refereed]

  Scientific journal


• Two-step photocurrent generation enhanced by miniband formation in InAs/GaAs quantum dot superlattice intermediate-band solar cells

  Sho Watanabe, Shigeo Asahi, Tomoyuki Kada, Kazuki Hirao, Toshiyuki Kaizu, Yukihiro Harada, Takashi Kita

  May 2017, APPLIED PHYSICS LETTERS, 110(19) (19), pp. 193104 - 1-5, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Two-step photon up-conversion solar cells

  Shigeo Asahi, Haruyuki Teranishi, Kazuki Kusaki, Toshiyuki Kaizu, Takashi Kita

  Apr. 2017, NATURE COMMUNICATIONS, 8, pp. 14962 - 1-9, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Recent advancement of semiconductor materials and devices: III: Design of semiconvuctor materials to improve conversion-efficiency limit of solar cells

  Shigeo Asahi, Takashi Kita

  Society of Materials Science Japan, Mar. 2017, Zairyo/Journal of the Society of Materials Science, Japan, 66(3) (3), 244 - 249, Japanese

  [Refereed]


• 半導体材料・デバイスの最新の進展 3. 太陽電池の変換効率限界を引き上げる半導体材料設計

  ASAHI SHIGEO, KITA TAKASHI

  Mar. 2017, 材料 別冊, 66(3) (3), pp. 244~249, Japanese

  [Refereed]

  Scientific journal


• Quantum-dot-based advanced photonic devices and its applications

  A. Matsumoto, K. Akahane, T. Umezawa, T. Kita, K. Utaka, N. Yamamoto

  OSA - The Optical Society, 2017, Optics InfoBase Conference Papers, 2017, English

  [Refereed]

  International conference proceedings


• Differential frequency tunable Dual-Mode heterogeneous QD laser with Si PIC

  A. Matsumoto, T. Umezawa, K. Akahane, N. Yamamoto, H. Yamada, T. Kita

  OSA - The Optical Society, 2017, Optics InfoBase Conference Papers, 2017, English

  [Refereed]

  International conference proceedings


• Effects of non-exciton components excited by broadband pulses on quantum beats in a GaAs/AlAs multiple quantum well

  Osamu Kojima, Yuki Iwasaki, Takashi Kita, Kouichi Akahane

  Jan. 2017, Scientific Reports, 7, pp. 41496 - 1-7, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Transverse-magnetic laser oscillation from highly stacked InAs/GaAs quantum dots

  Toshiyuki Kaizu, Masaya Suwa, Takaya Andachi, Yukihiro Harada, Takashi Kita

  Institute of Electrical and Electronics Engineers Inc., Dec. 2016, Conference Digest - IEEE International Semiconductor Laser Conference, English

  International conference proceedings


• Photocarrier transport dynamics in InAs/GaAs quantum dot superlattice solar cells using time-of-flight spectroscopy

  T. Tanibuchi, T. Kada, S. Asahi, D. Watanabe, T. Kaizu, Y. Harada, T. Kita

  Nov. 2016, PHYSICAL REVIEW B, 94(19) (19), pp. 195313 - 1 -9, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Polarization characteristics of electroluminescence and net modal gain in highly stacked InAs/GaAs quantum-dot laser devices

  Masaya Suwa, Takaya Andachi, Toshiyuki Kaizu, Yukihiro Harada, Takashi Kita

  Oct. 2016, JOURNAL OF APPLIED PHYSICS, 120(13) (13), pp. 134313 - 1-6, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Field-dependent characteristics of two-step photoexcited current generation in a quantum-dot superlattice solar cell

  Tomoyuki Kada, Shigeo Asahi, Yukihiro Harada, Takashi Kita

  Society of Materials Science Japan, Sep. 2016, Zairyo/Journal of the Society of Materials Science, Japan, 65(9) (9), 647 - 651, Japanese

  [Refereed]

  Scientific journal


• Organic-lead halide perovskite solar cell with ITO transparent electrode deposited by sputtering process

  Takumi Matsuda, Yoshikazu Tateishi, Kenichi Yamashita, Masatoshi Kitamura, Takashi Kita

  Sep. 2016, Zairyo/Journal of the Society of Materials Science, Japan, 65(9) (9), 642 - 646

  [Refereed]

  Scientific journal


• 量子ドット超格子太陽電池における2段階光励起電流生成ダイナミクスの電界依存特性

  加田 智之, 朝日 重雄, HARADA YUKIHIRO, KITA TAKASHI

  日本材料学会, Sep. 2016, 日本材料学会会誌「材料」, 65(9) (9), pp. 647 - 651, Japanese

  [Refereed]

  Scientific journal


• ペロブスカイト太陽電池へのITO透明電極スパッタリング直接堆積の影響

  松田 拓未, 立石 義和, 山下 兼一, KITAMURA MASATOSHI, KITA TAKASHI

  日本材料学会, Sep. 2016, 日本材料学会会誌「材料」, 65(9) (9), pp. 642 - 646, Japanese

  [Refereed]

  Scientific journal


• Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films

  Junpei Nagauchi, Osamu Kojima, Takashi Kita, YongGu Shim

  Jul. 2016, AIP ADVANCES, 6(7) (7), pp. 075209 - 1-7, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of exciton line widths on the amplitude of quantum beat oscillations

  KOJIMA OSAMU, T. Kita

  May 2016, Applied Physics Express, 9(6) (6), 062801 - 1-3, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Emission-wavelength tuning of InAs quantum dots grown on nitrogen-delta-doped GaAs(001)

  Toshiyuki Kaizu, Kohei Taguchi, Takashi Kita

  May 2016, JOURNAL OF APPLIED PHYSICS, 119(19) (19), pp. 194306 - 1-8, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Saturable Two-Step Photocurrent Generation in Intermediate-Band Solar Cells Including InAs Quantum Dots Embedded in Al0.3Ga0.7As/GaAs Quantum Wells

  Shigeo Asahi, Haruyuki Teranishi, Naofumi Kasamatsu, Tomoyuki Kada, Toshiyuki Kaizu, Takashi Kita

  Mar. 2016, IEEE JOURNAL OF PHOTOVOLTAICS, 6(2) (2), 465 - 472, English

  [Refereed]

  Scientific journal


• Nanosecond-scale hot-carrier cooling dynamics in one-dimensional quantum dot superlattices

  Yukihiro Harada, Naofumi Kasamatsu, Daiki Watanabe, Takashi Kita

  Mar. 2016, PHYSICAL REVIEW B, 93(11) (11), pp. 115303 - 1-5, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of rapid thermal annealing on two-dimensional delocalized electronic states of the epitaxial N delta-doped layer in GaAs

  Yasuhiro Ogawa, Yukihiro Harada, Takeshi Baba, Toshiyuki Kaizu, Takashi Kita

  Mar. 2016, APPLIED PHYSICS LETTERS, 108(11) (11), pp. 111905 - 1-4, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 20pBP-2 Spatial distribution of luminescence of cyanine molecule thin films by energy transfer

  Ito Yukako, Kojima Osamu, Kita Takashi, Yong Gu Shim

  The Physical Society of Japan (JPS), 2016, Meeting Abstracts of the Physical Society of Japan, 71, 1502 - 1502, Japanese

  [Refereed]


• 21aAG-10 Effects of magnetic field on terahertz generation due to differential-wave-mixing in a GaAs/AlAs multiple quantum well

  Tarui Y., Kojima O., Kita T., Majeed A., Ivanov P., Clarke E., Hogg R.

  The Physical Society of Japan (JPS), 2016, Meeting Abstracts of the Physical Society of Japan, 71, 1351 - 1351, Japanese

  [Refereed]


• 19pBH-6 Generation of quantum beat by spectrally controlled pulse in a GaAs/AlAs multiple quantum well II

  Kojima O., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 2016, Meeting Abstracts of the Physical Society of Japan, 71, 1458 - 1458, Japanese

  [Refereed]


• Polarization anisotropy of electroluminescence and net-modal gain in highly stacked InAs/GaAs quantum-dot laser devices

  Toshiyuki Kaizu, Masaya Suwa, Takaya Andachi, Yukihiro Harada, Takashi Kita

  2016, 2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS), English

  [Refereed]

  International conference proceedings


• Transverse-magnetic laser oscillation from highly stacked InAs/GaAs quantum dots

  Toshiyuki Kaizu, Masaya Suwa, Takaya Andachi, Yukihiro Harada, Takashi Kita

  2016, 2016 INTERNATIONAL SEMICONDUCTOR LASER CONFERENCE (ISLC), English

  [Refereed]

  International conference proceedings


• Two-Dimensional Energy Dispersion in Thermally Annealed Epitaxial Nitrogen Atomic Sheet in GaAs

  Yasuhiro Ogawa, Yukihiro Harada, Kaizu Toshiyuki, Takashi Kita

  2016, 2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS), English

  [Refereed]

  International conference proceedings


• GaAs first-spacer-layer thickness dependence of polarized photoluminescence properties of closely-stacked InAs/GaAs quantum dots with long-wavelength emission

  Yusuke Tajiri, Toshiyuki Kaizu, Takashi Kita

  2016, 2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS), English

  [Refereed]

  International conference proceedings


• Effective drift mobility approximation in multiple quantum-well solar cell

  Kasidit Toprasertpong, Tomoyuki Inoue, Kentaroh Watanabe, Takashi Kita, Masakazu Sugiyama, Yoshiaki Nakano

  2016, Proceedings of SPIE - The International Society for Optical Engineering, 9743(974315) (974315), English

  [Refereed]

  International conference proceedings


• Comparison of Electron and Hole Mobilities in Multiple-Quantum-Well Solar Cells Using a Time-of-Flight Technique

  Kasidit Toprasertpong, Taizo Tanibuchi, Hiromasa Fujii, Tomoyuki Kada, Shigeo Asahi, Kentaroh Watanabe, Masakazu Sugiyama, Takashi Kita, Yoshiaki Nakano

  Institute of Electrical and Electronics Engineers ({IEEE}), Nov. 2015, IEEE Journal of Photovoltaics, 5(6) (6), 1613 - 1620, English

  [Refereed]

  Scientific journal


• Broadband control of emission wavelength of InAs/GaAs quantum dots by GaAs capping temperature

  Toshiyuki Kaizu, Takuya Matsumura, Takashi Kita

  Oct. 2015, JOURNAL OF APPLIED PHYSICS, 118(15) (15), pp. 154301 - 1-6, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Analyses of saturable behavior of two-step photoexcitation in InAs/GaAs/Al0.3Ga0.7As intermediate-band solar cells

  Shigeo Asahi, Haruyuki Teranishi, Naofumi Kasamatsu, Tomoyuki Kada, Toshiyuki Kaizu, Takashi Kita

  Society of Materials Science Japan, Sep. 2015, Zairyo/Journal of the Society of Materials Science, Japan, 64(9) (9), 690 - 695, Japanese

  [Refereed]

  Scientific journal


• Analysis of optical waveguide mode in closely-stacked InAs/GaAs quantum dot semiconductor optical amplifiers

  Masaya Suwa, Tomoyuki Ohashi, Takaya Andachi, Toshiyuki Kaizu, Yukihiro Harada, Takashi Kita

  Society of Materials Science Japan, Sep. 2015, Zairyo/Journal of the Society of Materials Science, Japan, 64(9) (9), 685 - 689, Japanese

  [Refereed]

  Scientific journal


• 近接積層InAs/GaAs量子ドット半導体光アンプの光導波モード解析

  諏訪 雅也, 大橋 知幸, 安達 貴哉, KAIZU TOSHIYUKI, HARADA YUKIHIRO, KITA TAKASHI

  Sep. 2015, Journal of the Society of Materials Science, 64(9) (9), pp. 685 - 689, Japanese

  [Refereed]

  Scientific journal


• InAs/GaAs/Al0.3Ga0.7As中間バンド型太陽電池における室温2段階光励起の飽和現象の解析

  朝日 重雄, 寺西 陽之, 笠松 直史, 加田 智之, KAIZU TOSHIYUKI, KITA TAKASHI

  Sep. 2015, Journal of the Society of Materials Science, 64(9) (9), pp. 690~695, Japanese

  [Refereed]

  Scientific journal


• Analyses of saturable behavior of two-step photoexcitation in InAs/GaAs/Al0.3Ga0.7As intermediate-band solar cells

  Shigeo Asahi, Haruyuki Teranishi, Naofumi Kasamatsu, Tomoyuki Kada, Toshiyuki Kaizu, Takashi Kita

  Society of Materials Science Japan, Sep. 2015, Zairyo/Journal of the Society of Materials Science, Japan, 64(9) (9), 690 - 695, Japanese

  [Refereed]

  Scientific journal


• Microscopic observation of carrier-transport dynamics in quantum-structure solar cells using a time-of-flight technique

  Kasidit Toprasertpong, Naofumi Kasamatsu, Hiromasa Fujii, Tomoyuki Kada, Shigeo Asahi, Yunpeng Wang, Kentaroh Watanabe, Masakazu Sugiyama, Takashi Kita, Yoshiaki Nakano

  {AIP} Publishing, Jul. 2015, Applied Physics Letters, 107(4) (4), 043901 - 043901, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Microscopic observation of carrier-transport dynamics in quantum-structure solar cells using a time-of-flight technique

  Kasidit Toprasertpong, Naofumi Kasamatsu, Hiromasa Fujii, Tomoyuki Kada, Shigeo Asahi, Yunpeng Wang, Kentaroh Watanabe, Masakazu Sugiyama, Takashi Kita, Yoshiaki Nakano

  In this study, we propose a carrier time-of-flight technique to evaluate the carrier transport time across a quantum structure in an active region of solar cells. By observing the time-resolved photoluminescence signal with a quantum-well probe inserted under the quantum structure at forward bias, the carrier transport time can be efficiently determined at room temperature. The

  {AIP} Publishing, Jul. 2015, Applied Physics Letters, 107(4) (4), 043901 - 043901, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Fabrication of cyanine dye thin films grown by a layer-by-layer method

  Junpei Nagauchi, Osamu Kojima, Takashi Kita, YongGu Shim

  Jul. 2015, MATERIALS RESEARCH EXPRESS, 2(7) (7), pp. 076402 - 1-7, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Intermediate band solar cells: Recent progress and future directions

  Y. Okada, N. J. Ekins-Daukes, T. Kita, R. Tamaki, M. Yoshida, A. Pusch, O. Hess, C. C. Phillips, D. J. Farrell, K. Yoshida, N. Ahsan, Y. Shoji, T. Sogabe, J. -F. Guillemoles

  Jun. 2015, APPLIED PHYSICS REVIEWS, 2(2) (2), pp. 021302 - 1-48, English

  [Refereed]

  Scientific journal


• Two-step photon absorption in InAs/GaAs quantum-dot superlattice solar cells

  T. Kada, S. Asahi, T. Kaizu, Y. Harada, T. Kita, R. Tamaki, Y. Okada, K. Miyano

  May 2015, PHYSICAL REVIEW B, 91(20) (20), pp. 201303 - 1-6, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Thermal annealing effects on ultra-violet luminescence properties of Gd doped AlN

  Takashi Kita, Yuta Ishizu, Kazuma Tsuji, Yukihiro Harada, Yoshitaka Chigi, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi, Tsuguo Ishihara, Hirokazu Izumi

  Apr. 2015, JOURNAL OF APPLIED PHYSICS, 117(16) (16), pp. 193105 - 1-5, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Rapid dephasing related to intersubband transitions induced by exciton quantum beats observed by a pump-probe technique in a GaAs/AlAs multiple quantum well

  Osamu Kojima, Kenta Kojima, Takashi Kita, Kouichi Akahane

  Mar. 2015, PHYSICAL REVIEW B, 91(12) (12), pp. 125307 - 1-4, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 18pPSA-19 Luminescence due to inorganic-organic energy transfer in cyanine molecule thin films

  Ito Yukako, Kojima Osamu, Kita Takashi, Shim YongGu

  The Physical Society of Japan (JPS), 2015, Meeting Abstracts of the Physical Society of Japan, 70, 1271 - 1271, Japanese

  [Refereed]


• 18pPSB-7 Hysterisis in magneto-optical response in PbS colloidal quantum dots embedded in polymer films

  Harada Y., Shibakawa T., Hirota M., Kita T., Sakurai T., Ohta H.

  The Physical Society of Japan (JPS), 2015, Meeting Abstracts of the Physical Society of Japan, 70, 1115 - 1115, Japanese

  [Refereed]


• 16aCF-5 Generation of quantum beat by spectral shape controlled pulse in a GaAs/AlAs multiple quantum well

  Kojima O., Iwasaki Y., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 2015, Meeting Abstracts of the Physical Society of Japan, 70, 1158 - 1158, Japanese

  [Refereed]


• 24aBK-6 Hot carrier dynamics in InAs/GaAs quantum dot superlattices

  Harada Y., Watanabe D., Kasamatsu N., Kita T.

  The Physical Society of Japan (JPS), 2015, Meeting Abstracts of the Physical Society of Japan, 70, 1413 - 1413, Japanese

  [Refereed]


• Ultrafast Photocarrier Transport Dynamics in InAs/GaAs Quantum Dot Superlattice Solar Cell

  Taizo Tanibuchi, Tomoyuki Kada, Naofumi Kasamatsu, Takuya Matsumura, Shigeo Asahi, Takashi Kita

  2015, 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), English

  [Refereed]

  International conference proceedings


• Saturable Two-step Photo current Generation in Intermediate-band Solar Cells Including InAs Quantum Dots Embedded in Al0.3Ga0.7As/GaAs Quantum Wells

  Shigeo Asahi, Haruyuki Teranishi, Naofumi Kasamatsu, Tomoyuki Kada, Toshiyuki Kaizu, Takashi Kita

  2015, 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), English

  [Refereed]

  International conference proceedings


• Comparison of Electron and Hole Mobilities in Multiple Quantum Well Solar Cells Using a Time-of-Flight Technique

  Kasidit Toprasertpong, Taizo Tanibuchi, Hiromasa Fujii, Tomoyuki Kada, Shigeo Asahi, Kentaroh Watanabe, Masakazu Sugiyama, Takashi Kita, Yoshiaki Nakano

  2015, 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), English

  [Refereed]

  International conference proceedings


• Time-Resolved Photoluminescence of MBE-Grown 1 eV GaAsSbN for Multi-Junction Solar Cells

  Tomos Thomas, Naofumi Kasamatsu, Kian Hua Tan, Satrio Wicaksono, Wan Khai Loke, Soon Fatt Yoon, Andrew Johnson, Takashi Kita, Nicholas Ekins-Daukes

  2015, 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), English

  [Refereed]

  International conference proceedings


• Two-Step Photocarrier Generation in InAs/GaAs Quantum Dot Superlattice Intermediate Band Solar Cell

  Tomoyuki Kada, Taizo Tanibuchi, Shigeo Asahi, Toshiyuki Kaizu, Yukihiro Harada, Takashi Kita, Ryo Tamaki, Yoshitaka Okada, Kenjiro Miyano

  2015, 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), English

  [Refereed]

  International conference proceedings


• Microscopic properties of degradation-free capped GdN thin films studied by electron spin resonance

  Tokuro Shimokawa, Yohei Fukuoka, Masashi Fujisawa, Weimin Zhang, Susumu Okubo, Takahiro Sakurai, Hitoshi Ohta, Reddithota Vidyasagar, Hiroaki Yoshitomi, Shinya Kitayama, Takashi Kita

  Jan. 2015, JOURNAL OF APPLIED PHYSICS, 117(4) (4), 043909 - 1~6, English

  [Refereed]

  Scientific journal


• Suppression of thermal carrier escape and enhanced two-step photon absorption in quantum-dot intermediate-band solar cells with a high-potential barrier

  S. Asahi, H. Teranishi, N. Kasamatsu, T. Kada, T. Kaizu, T. Kita

  2015, PHYSICS SIMULATION AND PHOTONIC ENGINEERING OF PHOTOVOLTAIC DEVICES IV, 9358, English

  [Refereed]

  International conference proceedings


• Carrier Time-of-Flight Measurement Using a Probe Structure for Direct Evaluation of Carrier Transport in Multiple Quantum Well Solar Cells

  Kasidit Toprasertpong, Naofumi Kasamatsu, Hiromasa Fujii, Tomoyuki Kada, Shigeo Asahi, Yunpeng Wang, Kentaroh Watanabe, Masakazu Sugiyama, Takashi Kita, Yoshiaki Nakano

  Institute of Electrical and Electronics Engineers ({IEEE}), Nov. 2014, IEEE Journal of Photovoltaics, 4(6) (6), 1518 - 1525, English

  [Refereed]

  Scientific journal


• Photoluminescence Properties of InAs Quantum Dots on Nitrogen δ-Doped GaAs

  KAIZU TOSHIYUKI, KITA TAKASHI

  Nov. 2014, 14th International Symposium on Advanced Fluid Information, 148 - 149, English

  International conference proceedings


• Effect of exciton oscillator strength on upconversion photoluminescence in GaAs/AlAs multiple quantum wells

  Osamu Kojima, Shouhei Okumura, Takashi Kita, Kouichi Akahane

  Nov. 2014, APPLIED PHYSICS LETTERS, 105(18) (18), pp. 1 - 3, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Hot-carrier solar cells using low-dimensional quantum structures

  Daiki Watanabe, Naofumi Kasamatsu, Yukihiro Harada, Takashi Kita

  Oct. 2014, APPLIED PHYSICS LETTERS, 105(17) (17), pp. 1 - 5, English

  [Refereed]

  Scientific journal


• Suppression of thermal carrier escape and efficient photo-carrier generation by two-step photon absorption in InAs quantum dot intermediate-band solar cells using a dot-in-well structure

  S. Asahi, H. Teranishi, N. Kasamatsu, T. Kada, T. Kaizu, T. Kita

  Aug. 2014, JOURNAL OF APPLIED PHYSICS, 116(6) (6), pp. 063510 - 1-5, English

  [Refereed]

  Scientific journal


• Polarization-insensitive optical gain characteristics of highly stacked InAs/GaAs quantum dots

  Takashi Kita, Masaya Suwa, Toshiyuki Kaizu, Yukihiro Harada

  Jun. 2014, JOURNAL OF APPLIED PHYSICS, 115(23) (23), 233512 - 1-5, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Resonant indirect excitation of Gd3+ in AlN thin films

  Yuta Ishizu, Kazuma Tsuji, Yukihiro Harada, Takashi Kita, Yoshitaka Chigi, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi, Tsuguo Ishihara, Hirokazu Izumi

  May 2014, JOURNAL OF APPLIED PHYSICS, 115(17) (17), 173508 - 1-6, English

  [Refereed]

  Scientific journal


• Electronic transitions in GdN band structure

  R. Vidyasagar, T. Kita, T. Sakurai, H. Ohta

  May 2014, JOURNAL OF APPLIED PHYSICS, 115(20) (20), 203717 - 1-5, English

  [Refereed]

  Scientific journal


• 中間バンド型高効率太陽電池―量子ナノ構造中における光キャリアダイナミックス―

  KITA TAKASHI, HARADA YUKIHIRO

  応用物理学会, May 2014, 応用物理, 83(5) (5), 348 - 355, Japanese

  [Refereed]


• Pulse modulation towards low-power operation based on the quantum beat of excitons in a GaAs/AlAs multiple quantum well

  Osamu Kojima, Ken Hayashii, Takashi Kita, Kouichi Akahane

  Mar. 2014, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 47(10) (10), 105101 - 1~5, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effect of internal electric field on InAs/GaAs quantum dot solar cells

  Naofumi Kasamatsu, Tomoyuki Kada, Aiko Hasegawa, Yukihiro Harada, Takashi Kita

  Feb. 2014, JOURNAL OF APPLIED PHYSICS, 115(8) (8), 083510 - 1-5, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Control of optical properties in cyanine dye thin film fabricated by a layer-by-layer method

  Osamu Kojima, Ryoji Fujii, Takashi Kita, YongGu Shim

  Feb. 2014, JOURNAL OF APPLIED PHYSICS, 115(8) (8), 083503 - 1~4, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Epitaxial two-dimensional nitrogen atomic sheet in GaAs

  Yukihiro Harada, Masuki Yamamoto, Takeshi Baba, Takashi Kita

  Jan. 2014, APPLIED PHYSICS LETTERS, 104(4) (4), 041907 - 1~4, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Fabrication of InAs Qantum Dots on Nitrided GaAs (001) Surface

  KAIZU TOSHIYUKI, KITA TAKASHI

  Nov. 2013, 13th International Symposium on Advanced Fluid Information, 102 - 103, English

  [Refereed]

  International conference proceedings


• 自己形成過程を原子レベルで制御した量子ドットの作製と高機能光応答の実現

  KITA TAKASHI

  Sep. 2013, スマートプロセス学会誌(別刷), Vol.2(No.5) (No.5), 206 - 212, Japanese

  [Refereed]

  Scientific journal


• Control of stacking direction and optical anisotropy in InAs/GaAs quantum dots by In flux

  Yusuke Bessho, Yukihiro Harada, Takashi Kita, Eiji Taguchi, Hidehiro Yasuda

  Jul. 2013, JOURNAL OF APPLIED PHYSICS, 114(3) (3), 033517 - 1-5, English

  [Refereed]

  Scientific journal


• Intraband carrier dynamics in InAs/GaAs quantum dots stimulated by bound-to-continuum excitation

  Yukihiro Harada, Tsuyoshi Maeda, Takashi Kita

  Jun. 2013, Journal of Applied Physics, 113(22) (22), 223511 - 1-5, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• One-dimensional miniband formation in closely stacked InAs/GaAs quantum dots

  Akihiro Takahashi, Tatsuya Ueda, Yusuke Bessho, Yukihiro Harada, Takashi Kita, Eiji Taguchi, Hidehiro Yasuda

  Jun. 2013, PHYSICAL REVIEW B, 87(23) (23), 2353323 - 1-6, English

  [Refereed]

  Scientific journal


• Giant optical splitting in the spin-states assisting a sharp magnetic switching in GdN thin films

  R. Vidyasagar, T. Kita, T. Sakurai, H. Ohta

  Jun. 2013, APPLIED PHYSICS LETTERS, 102(22) (22), 222408 1 - 4, English

  [Refereed]

  Scientific journal


• Physical Properties of Amorphous In-Ga-Zn-O Films Deposited at Different Sputtering Pressures

  Satoshi Yasuno, Takashi Kita, Aya Hino, Shinya Morita, Kazushi Hayashi, Toshihiro Kugimiya

  Mar. 2013, JAPANESE JOURNAL OF APPLIED PHYSICS, 52(3) (3), 03BA01 - 5, English

  [Refereed]

  Scientific journal


• Evaluation of Minority and Majority Spin Band Energies of Ferromagnetic GdN thin film using Optical Absorption Spectroscopy

  R. Vidyasagar, H. Yoshitomi, S. Kitayama, T. Kita, H. Ohta, T. Sakurai

  2013, PHYSICS OF SEMICONDUCTORS, 1566, 325 - +, English

  [Refereed]

  International conference proceedings


• Carrier Dynamics in Intermediate States of InAs/GaAs Quantum Dots Embedded in Photonic Cavity Structure

  Takashi Kita, Tsuyoshi Maeda, Yukihiro Harada

  2013, 2012 IEEE 38TH PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC), VOL 2, English

  [Refereed]

  International conference proceedings


• Carrier Dynamics in Intermediate States of InAs/GaAs Quantum Dots Embedded in Photonic Cavity Structure

  Takashi Kita, Tsuyoshi Maeda, Yukihiro Harada

  2013, 2012 IEEE 38TH PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC), VOL 2, English

  [Refereed]

  International conference proceedings


• Effects of pumping on propagation velocities of confined exciton polaritons in GaAs/AlxGa1-xAs double heterostructure thin films under resonant and non-resonant probe conditions

  Osamu Kojima, Shohei Ohta, Takashi Kita, Toshiro Isu

  Jan. 2013, JOURNAL OF APPLIED PHYSICS, 113(1) (1), 074305 - 1-4, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Tuning optical and ferromagnetic properties of thin GdN films by nitrogen-vacancy centers

  Reddithota Vidyasagar, Shinya Kitayama, Hiroaki Yoshitomi, Takashi Kita, Takahiro Sakurai, Hitoshi Ohta

  2013, European Physical Journal B, 86(2) (2), 52 - 1-4, English

  [Refereed]

  Scientific journal


• Magneto-optical effect in GdN epitaxial thin film

  R. Vidya Sagar, H. Yoshitomi, S. Kitayama, T. Kita, H. Ohta, T. Sakurai

  2013, 15TH INTERNATIONAL CONFERENCE ON THIN FILMS (ICTF-15), 417, 012053 - 1-4, English

  [Refereed]

  International conference proceedings


• Intraband carrier dynamics in InAs/GaAs quantum dots studied by two-color excitation spectroscopy

  Yukihiro Harada, Tsuyoshi Maeda, Takashi Kita

  2013, Proceedings of SPIE - The International Society for Optical Engineering, 8620, 862008 - 1-7, English

  [Refereed]

  International conference proceedings


• Correlation between local atomic structure and ultraviolet luminescence of AlGdN thin films

  Kuniyuki Ichii, Shinya Kitayama, Shinya Iwahashi, Junya Nakamura, Vidya Sagar Reddithota, Takashi Kita, Yoshitaka Chigi, Tetsurou Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi, Tsuguo Ishihara, Hirokazu Izumi

  Institute of Physics Publishing, 2013, Journal of Physics: Conference Series, 417(1) (1), 012049 - 1-6, English

  [Refereed]

  International conference proceedings


• Polarization controlled emisson from closely stacked InAs/GaAs quantum dots

  Masaya Suwa, Akihiro Takahashi, Tatsuya Ueda, Bessho Yusuke, Yukihiro Harada, Takashi Kita

  2013, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 10, NO 11, 10(11) (11), 1492 - 1495, English

  [Refereed]

  International conference proceedings


• Enhancement of Optical Anisotropy by Interconnection Effect along Growth Direction in Multistacked Quantum Dots

  H. Tanaka, KOJIMA OSAMU, KITA TAKASHI, K. Akahane

  応用物理学会, Dec. 2012, Jpn J Appl Phys, 52, 012001 - 1-4, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Application of Microwave Photoconductivity Decay Method to Characterization of Amorphous In-Ga-Zn-O Films

  Satoshi Yasuno, Takashi Kita, Shinya Morita, Aya Hino, Kazushi Hayashi, Toshihiro Kugimiya, Shingo Sumie

  Nov. 2012, IEICE TRANSACTIONS ON ELECTRONICS, E95C(11) (11), 1724 - 1729, English

  [Refereed]

  Scientific journal


• Transient photoconductivity responses in amorphous In-Ga-Zn-O films

  Satoshi Yasuno, Takashi Kita, Shinya Morita, Toshihiro Kugimiya, Kazushi Hayashi, Shingo Sumie

  Sep. 2012, JOURNAL OF APPLIED PHYSICS, 112(5) (5), English

  [Refereed]

  Scientific journal


• Ferromagnetic properties of GdN thin films studied by temperature dependent circular polarized spectroscopy

  H. Yoshitomi, R. Vidyasagar, S. Kitayama, T. Kita, H. Ohta, S. Okubo, Y. Fukuoka, T. Sakurai

  Aug. 2012, APPLIED PHYSICS LETTERS, 101(7) (7), 072403 - 1-5, English

  [Refereed]

  Scientific journal


• Carrier dynamics of the intermediate state in InAs/GaAs quantum dots coupled in a photonic cavity under two-photon excitation

  Takashi Kita, Tsuyoshi Maeda, Yukihiro Harada

  Jul. 2012, PHYSICAL REVIEW B, 86(3) (3), 035301 - 1-7, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Study on spin-splitting phenomena in the band structure of GdN

  R. Vidyasagar, S. Kitayama, H. Yoshitomi, T. Kita, T. Sakurai, H. Ohta

  Jun. 2012, APPLIED PHYSICS LETTERS, 100(23) (23), 232410 - 1-4, English

  [Refereed]

  Scientific journal


• Multiple excitation process in deep-ultraviolet emission from AlGdN thin films pumped by an electron beam

  Shinya Iwahashi, Naohiro Kishi, Shinya Kitayama, Takashi Kita, Yoshitaka Chigi, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi, Tsuguo Ishihara, Hirokazu Izumi

  Apr. 2012, JOURNAL OF APPLIED PHYSICS, 111(8) (8), 083526 - 1-4, English

  [Refereed]

  Scientific journal


• Effect of spacer layer thickness on multi-stacked InGaAs quantum dots grown on GaAs (311)B substrate for application to intermediate band solar cells

  Yasushi Shoji, Kohei Narahara, Hideharu Tanaka, Takashi Kita, Katsuhiro Akimoto, Yoshitaka Okada

  Apr. 2012, JOURNAL OF APPLIED PHYSICS, 111(7) (7), 074305 - 1-4, English

  [Refereed]

  Scientific journal


• Physical properties of amorphous In-Ga-Zn-O films deposited under various sputtering pressure

  Satoshi Yasuno, Takashi Kita, Shinya Morita, Aya Hino, Kazushi Hayashi, Toshihiro Kugimiya

  2012, 2012 19TH INTERNATIONAL WORKSHOP ON ACTIVE-MATRIX FLATPANEL DISPLAYS AND DEVICES (AM-FPD): TFT TECHNOLOGIES AND FPD MATERIALS, 147 - 150, English

  [Refereed]

  International conference proceedings


• Quantum dot switches: Towards nanoscale power-efficient all-optical signal processing

  Chao-Yuan Jin, Mark Hopkinson, Osamu Kojima, Takashi Kita, Kouichi Akahane, Osamu Wada

  Springer New York, Jan. 2012, Quantum Dot Devices, 197 - 222, English

  [Refereed]

  In book


• Ultraviolet light emitting devices using AlGdN

  Takashi Kita, Shinya Kitayama, Tsuguo Ishihara, Hirokazu Izumi, Yoshitaka Chigi, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi

  2012, Materials Research Society Symposium Proceedings, 1342, 87 - 92, English

  [Refereed]

  International conference proceedings


• Observation of quantum beat oscillations and ultrafast relaxation of excitons confined in GaAs thin films by controlling probe laser pulses

  Shohei Ohta, Osamu Kojima, Takashi Kita, Toshiro Isu

  Jan. 2012, JOURNAL OF APPLIED PHYSICS, 111(2) (2), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Near-field photoluminescence spectroscopy of CdTe/Cd0.75Mn0.25Te tilted superlattices

  Yukihiro Harada, Takashi Kita, Kazunari Matsuda, Yoshihiko Kanemitsu, Henri Mariette

  2012, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 2, 9(2) (2), English

  [Refereed]

  International conference proceedings


• High-resolution optical coherence tomography using broadband light source with strain-controlled InAs/GaAs quantum dots

  Ippei Tsubaki, Yukihiro Harada, Takashi Kita

  2012, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 12, 9(12) (12), 2473 - 2476, English

  [Refereed]

  International conference proceedings


• Ferromagnetic transition and spin-ordering-induced band-gap reduction in GdN thin films

  Hiroaki Yoshitomi, Shinya Kitayama, Takashi Kita, Youhei Fukuoka, Masashi Fujisawa, Wei-Min Zhang, Susumu Okubo, Hitoshi Ohta, Takahiro Sakurai

  Nov. 2011, Zairyo/Journal of the Society of Materials Science, Japan, 60(11) (11), 1004 - 1008, Japanese

  [Refereed]

  Scientific journal


• Suppression of nonradiative recombination process in directly Si-doped InAs/GaAs quantum dots

  Takashi Kita, Ryuichi Hasagawa, Tomoya Inoue

  Nov. 2011, JOURNAL OF APPLIED PHYSICS, 110(10) (10), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Intermediate Band Photovoltaics Based on Interband-intraband Transitions Using In0.53Ga0.47As/InP Superlattice

  W G Hu, Y Harada, A Hasegawa, T Inoue, O Kojima, T Kita

  Nov. 2011, Progress in Photovoltaics:Research and Applications, Vol. 19, Issue8, pp. 1~9, English

  [Refereed]

  Scientific journal


• Influence of local atomic configuration in AlGdN phosphor thin films on deep ultra-violet luminescence intensity

  Shinya Kitayama, Hiroaki Yoshitomi, Shinya Iwahashi, Junya Nakamura, Takashi Kita, Yoshitaka Chigi, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi, Tsuguo Ishihara, Hirokazu Izumi

  Nov. 2011, JOURNAL OF APPLIED PHYSICS, 110(9) (9), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Dynamics of above-barrier state excitons in multi-stacked quantum dots

  Osamu Kojima, Naoki Tobita, Takashi Kita, Kouichi Akahane

  Nov. 2011, JOURNAL OF APPLIED PHYSICS, 110(9) (9), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Saturation of Forster resonance energy transfer between two optically nonlinear cyanine dyes of small Stokes shift energies in polymer thin films

  Osamu Kojima, Shogo Hamano, Takashi Kita, Osamu Wada

  Oct. 2011, JOURNAL OF APPLIED PHYSICS, 110(8) (8), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Extremely uniform bound exciton states in nitrogen delta-doped GaAs studied by photoluminescence spectroscopy in external magnetic fields

  Yukihiro Harada, Terutada Kubo, Tomoya Inoue, Osamu Kojima, Takashi Kita

  Oct. 2011, JOURNAL OF APPLIED PHYSICS, 110(8) (8), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Experimental and atomistic theoretical study of degree of polarization from multilayer InAs/GaAs quantum dot stacks

  Muhammad Usman, Tomoya Inoue, Yukihiro Harda, Gerhard Klimeck, Takashi Kita

  Sep. 2011, PHYSICAL REVIEW B, 84(11) (11), English

  [Refereed]

  Scientific journal


• Depolarization effect on optical control of exciton states confined in GaAs thin films

  Takae Yamashita, Osamu Kojima, Takashi Kita, Toshiro Isu

  Aug. 2011, JOURNAL OF APPLIED PHYSICS, 110(4) (4), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Observation of phase shifts in a vertical cavity quantum dot switch

  C. Y. Jin, O. Kojima, T. Kita, O. Wada, M. Hopkinson

  Jun. 2011, APPLIED PHYSICS LETTERS, 98(23) (23), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Multidirectional Observation of Photoluminescence Polarization Anisotropy in Closely Stacked InAs/GaAs Quantum Dots

  Yuichiro Ikeuchi, Tomoya Inoue, Masaki Asada, Yukihiro Harada, Takashi Kita, Eiji Taguchi, Hidehiro Yasuda

  Jun. 2011, APPLIED PHYSICS EXPRESS, 4(6) (6), English

  [Refereed]

  Scientific journal


• Optical and magnetic properties in epitaxial GdN thin films

  H. Yoshitomi, S. Kitayama, T. Kita, O. Wada, M. Fujisawa, H. Ohta, T. Sakurai

  Apr. 2011, PHYSICAL REVIEW B, 83(15) (15), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Field-emission properties of carbon nanotube composite in side-electron emission configuration

  Naohiro Kishi, Takashi Kita, Akira Magario, Toru Noguchi

  Apr. 2011, JOURNAL OF APPLIED PHYSICS, 109(7) (7), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Narrowband ultraviolet light emission from AlGdN polycrystalline thin films

  Takashi Kita, Shinya Kitayama, Hiroaki Yoshitomi, Tsuguo Ishihara, Hirokazu Izumi, Yoshitaka Chigi, Yoshihiro Kasai, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi

  Mar. 2011, JOURNAL OF CERAMIC PROCESSING RESEARCH, 12, S73 - S77, English

  [Refereed]

  Scientific journal


• Dephasing of excitonic polaritons confined in GaAs thin films

  KOJIMA Osamu, WATANABE Shingo, KITA Takashi, WADA Osamu, ISU Toshiro

  Feb. 2011, Journal of the Physical Society of Japan, Vol 80. No. 3, pp. 034704-1-5, English

  [Refereed]

  Scientific journal


• Bound biexciton luminescence in nitrogen delta-doped GaAs

  Yukihiro Harada, Osamu Kojima, Takashi Kita, Osamu Wada

  Feb. 2011, PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 248(2) (2), 464 - 467, English

  [Refereed]

  Scientific journal


• Effects of argon plasma irradiation on amorphous In-Ga-Zn-O film evaluated by microwave photoconductivity decay method

  Satoshi Yasuno, Takashi Kita, Shinya Morita, Kazushi Hayashi, Toshihiro Kugimiya, Shingo Sumie

  2011, IDW'11: PROCEEDINGS OF THE 18TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3, 103 - 106, English

  [Refereed]

  International conference proceedings


• Two-photons transition in intermediate band solar cells

  W. G. Hu, Y. Harada, T. Inoue, O. Kojima, T. Kita

  2011, Conference Record of the IEEE Photovoltaic Specialists Conference, 002625 - 002628, English

  [Refereed]

  International conference proceedings


• 希土類窒化物半導体GdN薄膜の強磁性相転移とスピン秩序誘起のバンドギャップ減少

  吉富 大明, 來山 真也, 喜多 隆, 福岡 洋平, 藤澤 真士, 張 衛民, 大久保 晋, 太田 仁, 櫻井 敬博

  2011, 材料, vol.60,No11,pp.1004-1008, Japanese

  [Refereed]

  Scientific journal


• Increase in photocurrent by optical transitions via intermediate quantum states in direct-doped InAs/GaNAs strain-compensated quantum dot solar cell

  Yoshitaka Okada, Takayuki Morioka, Katsuhisa Yoshida, Ryuji Oshima, Yasushi Shoji, Tomoya Inoue, Takashi Kita

  Jan. 2011, JOURNAL OF APPLIED PHYSICS, 109(2) (2), English

  [Refereed]

  Scientific journal


• Ferromagnetic State of GdN Thin Film Studied by Ferromagnetic Resonance

  H. Ohta, M. Fujisawa, F. Elmasry, S. Okubo, Y. Fukuoka, H. Yoshitomi, S. Kitayama, T. Kita, O. Wada

  2011, PHYSICS OF SEMICONDUCTORS: 30TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, 1399, English

  [Refereed]

  International conference proceedings


• Energy band structure and the half-filling of the intermediate band in the quantum-dot solar cell

  W. G. Hu, T. Inoue, O. Kojima, T. Kita

  2011, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 2, 8(2) (2), English

  [Refereed]

  International conference proceedings


• Broadband light sources using InAs quantum dots with InGaAs strain-reducing layers

  Megumi Tsuda, Tomoya Inoue, Takashi Kita, Osamu Wada

  2011, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 2, 8(2) (2), English

  [Refereed]

  International conference proceedings


• Intraband relaxation process in highly stacked quantum dots

  Osamu Kojima, Masataka Mamizuka, Takashi Kita, Osamu Wada, Kouichi Akahane

  2011, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 1, 8(1) (1), English

  [Refereed]

  International conference proceedings


• Excitation power dependence of nonlinear optical response of excitons in GaAs/AlAs superlattices

  Takae Yamashita, Osamu Kojima, Takashi Kita, Kouichi Akahane

  2011, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 1, 8(1) (1), English

  [Refereed]

  International conference proceedings


• Propagation velocity of excitonic polaritons confined in GaAs thin films

  Osamu Kojima, Shingo Watanabe, Takashi Kita, Osamu Wada, Toshiro Isu

  2011, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 2, 8(2) (2), English

  [Refereed]

  International conference proceedings


• Optical and ferromagnetic properties of GdN thin films

  Hiroaki Yoshitomi, Shinya Kitayama, Takashi Kita, Osamu Wada, Masashi Fujisawa, Hitoshi Ohta, Takahiro Sakurai

  2011, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 2, 8(2) (2), English

  [Refereed]

  International conference proceedings


• Interaction between conduction-band edge and nitrogen-related localized levels in nitrogen delta-doped GaAs

  Yukihiro Harada, Osamu Kojima, Takashi Kita, Osamu Wada

  2011, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 2, 8(2) (2), English

  [Refereed]

  International conference proceedings


• Magneto-Photoluminescence Spectroscopy of Exciton Fine Structure in Nitrogen delta-Doped GaAs

  Yukihiro Harada, Yoshiki Horiuchi, Osamu Kojima, Takashi Kita, Osamu Wada

  2011, PHYSICS OF SEMICONDUCTORS: 30TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, 1399, English

  [Refereed]

  International conference proceedings


• Spatially Resolved Thermal Conductivity of Intermetallic Compounds Measured by Micro-Thermoreflectance Method

  Syugo Miyake, Yasuko Nagano, Aya Miyake, Hiroyuki Takamatsu, Takashi Kita

  Nov. 2010, JOURNAL OF THE JAPAN INSTITUTE OF METALS, 74(11) (11), 740 - 745, Japanese

  [Refereed]

  Scientific journal


• Effects of absorption coefficients and intermediate-band filling in InAs/GaAs quantum dot solar cells

  W. G. Hu, T. Inoue, O. Kojima, T. Kita

  Nov. 2010, APPLIED PHYSICS LETTERS, 97(19) (19), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Detailed Design and Characterization of All-Optical Switches Based on InAs/GaAs Quantum Dots in a Vertical Cavity

  Chao-Yuan Jin, Osamu Kojima, Tomoya Inoue, Takashi Kita, Osamu Wada, Mark Hopkinson, Kouichi Akahane

  Nov. 2010, IEEE JOURNAL OF QUANTUM ELECTRONICS, 46(11) (11), 1582 - 1589, English

  [Refereed]

  Scientific journal


• Highly efficient ultra-violet luminescence from low-temperature grown AlGdN

  Shinya Kttayama, Hiroaki Yoshitomi, Takashi Kita, Osamu Wada, Yoshitaka Chigist, Tetsurou Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi, Tsuguo IsHIHARA, Hirokazu Izumi

  Sep. 2010, Zairyo/Journal of the Society of Materials Science, Japan, 59(9) (9), 666 - 670, Japanese

  [Refereed]

  Scientific journal


• Impurity doping in self-assembled InAs/GaAs quantum dots by selection of growth steps

  Tomoya Inoue, Satoshi Kido, Kengo Sasayama, Takashi Kita, Osamu Wada

  Sep. 2010, JOURNAL OF APPLIED PHYSICS, 108(6) (6), English

  [Refereed]

  Scientific journal


• Polarization control of electroluminescence from vertically stacked InAs/GaAs quantum dots

  Tomoya Inoue, Masaki Asada, Nami Yasuoka, Osamu Kojima, Takashi Kita, Osamu Wada

  May 2010, APPLIED PHYSICS LETTERS, 96(21) (21), English

  [Refereed]

  Scientific journal


• Temperature-dependent carrier tunneling for self-assembled InAs/GaAs quantum dots with a GaAsN quantum well injector

  C. Y. Jin, S. Ohta, M. Hopkinson, O. Kojima, T. Kita, O. Wada

  Apr. 2010, APPLIED PHYSICS LETTERS, 96(15) (15), English

  [Refereed]

  Scientific journal


• Temperature dependence of photoluminescence characteristics of excitons in stacked quantum dots and quantum dot chains

  Osamu Kojima, Hiroaki Nakatani, Takashi Kita, Osamu Wada, Kouichi Akahane

  Apr. 2010, JOURNAL OF APPLIED PHYSICS, 107(7) (7), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Statistical fluctuation of magnetization in Mn-composition modulated Cd1-xMnxTe quantum wires

  Yukihiro Harada, Takashi Kita, Osamu Wada, Hiroaki Ando

  Feb. 2010, JOURNAL OF APPLIED PHYSICS, 107(4) (4), English

  [Refereed]

  Scientific journal


• All-optical switch using InAs quantum dots in a vertical cavity

  C. Y. Jin, O. Kojima, T. Inoue, S. Ohta, T. Kita, O. Wada, M. Hopkinson, K. Akahane

  2010, 2010 22ND INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE AND RELATED MATERIALS (IPRM), English

  [Refereed]

  International conference proceedings


• ENERGY BAND STRUCTURE AND ABSORPTION COEFFICIENTS IN THE QUANTUM-DOT INTERMEDIATE BAND SOLAR CELLS

  W. G. Hu, T. Inoue, O. Kojima, T. Kita

  2010, 35TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 1808 - 1813, English

  [Refereed]

  International conference proceedings


• Self-assembled InAs quantum dots within a vertical cavity structure for all-optical switching devices

  C. Y. Jin, O. Kojima, T. Inoue, T. Kita, O. Wada, M. Hopkinson, K. Akahane

  2010, QUANTUM DOTS AND NANOSTRUCTURES: SYNTHESIS, CHARACTERIZATION, AND MODELING VII, 7610, English

  [Refereed]

  International conference proceedings


• Vertically-stacked InAs quantum dots for polarization-independent semiconductor optical amplifiers

  Tomoya Inoue, Masaki Asada, Osamu Kojima, Takashi Kita, Osamu Wada

  2010, PHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES XVIII, 7597, English

  [Refereed]

  International conference proceedings


• INTRABAND RELAXATION OF PHOTOEXCITED CARRIERS IN MULTIPLE STACKED QUANTUM DOTS AND QUANTUM DOT CHAINS

  Osamu Kojima, Masataka Mamizuka, Takashi Kita, Osamu Wada, Kouichi Akahane

  2010, 35TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, English

  [Refereed]

  International conference proceedings


• MULTI-STACKED InAs/GaNAs QUANTUM DOTS WITH DIRECT Si DOPING FOR USE IN INTERMEDIATE BAND SOLAR CELL

  Takayuki Morioka, Ryuji Oshima, Ayami Takata, Yasushi Shoji, Tomoya Inoue, Takashi Kita, Yoshitaka Okada

  2010, 35TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, 1834 - 1837, English

  [Refereed]

  International conference proceedings


• 低温成長したAlGdN蛍光体薄膜における深紫外発光効率の向上

  來山 真也, 吉富 大明, 喜多 隆, 和田 修, 千木 慶隆, 西本 哲郎, 田中 寛之, 小林 幹弘, 石原 嗣生, 泉 宏和

  2010, 材料, Vol. 59, No.9, pp. 666-670, Japanese

  [Refereed]

  Scientific journal


• Vertical stacking of InAs quantum dots for polarization-insensitive semiconductor optical amplifiers

  T. Inoue, M. Asada, N. Yasuoka, T. Kita, O. Wada

  2010, QUANTUM DOTS 2010, 245, English

  [Refereed]

  International conference proceedings


• Self-assembled InAs quantum dots within a vertical cavity structure for all-optical switching devices

  C. Y. Jin, O. Kojima, T. Inoue, T. Kita, O. Wada, M. Hopkinson, K. Akahane

  2010, QUANTUM DOTS AND NANOSTRUCTURES: SYNTHESIS, CHARACTERIZATION, AND MODELING VII, 7610, English

  [Refereed]

  International conference proceedings


• Anisotropic linear-polarization luminescence in CdTe/CdMnTe quantum wires

  Yukihiro Harada, Takashi Kita, Osamu Wada, Hiroaki Ando, Henri Mariette

  Dec. 2009, JOURNAL OF LUMINESCENCE, 129(12) (12), 1448 - 1453, English

  [Refereed]

  Scientific journal


• Analysis of thermoreflectance signals and characterization of thermal conductivity of metal thin films

  Syugo Miyake, Takashi Kita, Aya Miyake, Ken-ichi Ikeda, Hiroyuki Takamatsu

  Dec. 2009, REVIEW OF SCIENTIFIC INSTRUMENTS, 80(12) (12), English

  [Refereed]

  Scientific journal


• Side electron emission device using a composite of carbon nanofibers and aluminum

  Hirotaka Tanaka, Hironao Nakamura, Hisao Yanagi, Takashi Kita, Kazuyuki Yokoyama, Akira Magario, Toru Noguchi

  Nov. 2009, THIN SOLID FILMS, 518(2) (2), 530 - 533, English

  [Refereed]

  Scientific journal


• Vertical-geometry all-optical switches based on InAs/GaAs quantum dots in a cavity

  C. Y. Jin, O. Kojima, T. Kita, O. Wada, M. Hopkinson, K. Akahane

  Jul. 2009, APPLIED PHYSICS LETTERS, 95(2) (2), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Thermal conductivity measurement technique for Cu-Pt alloy thin films by a modulated thermoreflectance method

  Syugo Miyake, Aya Miyake, Ken-Ichi Ikeda, Hiroyuki Takamatsu, Takashi Kita

  Jun. 2009, Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 73(6) (6), 434 - 438, Japanese

  [Refereed]

  Scientific journal


• Quantum dots in a vertical cavity for all-optical switching devices

  C. Y. Jin, O. Kojima, T. Kita, O. Wada, M. Hopkinson, K. Akahane

  2009, 2009 IEEE 21ST INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM), 406 - +, English

  [Refereed]

  International conference proceedings


• 原子層窒素ドープGaAsを用いた励起子微細構造の制御と光子源に向けた展開

  T Kita

  応用物理学会, 2009, 応用物理, Vol. 78, No.4, pp. 355-359(4) (4), 355 - 359, Japanese

  [Refereed]

  Scientific journal


• Controlling Polarization in Quantum-dot Semiconductor Optical Amplifiers

  N. Yasuoka, H. Ebe, K. Kwaguchi, M. Ekawa, KITA TAKASHI, O. Wada, M. Sugawara, T. Saito, Y. Arakawa

  神戸大学大学院工学研究科, 2009, Memoirs of the Graduate School of Engineering Kobe University, 1(1) (1), 1 - 8, English

  [Refereed]

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• Transient reflectivity response with negative time delay caused by femtosecond pulse propagation in GaAs thin films

  Shingo Watanabe, Osamu Kojima, Takashi Kita, Osamu Wada, Toshiro Isu

  2009, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, SUPPL 1, 6, S139 - S142, English

  [Refereed]

  International conference proceedings


• Exciton response controlled by introducing a spacer layer in nitrided InAs quantum dots

  Masataka Mamizuka, Osamu Kojima, Tomoya Inoue, Takashi Kita, Osamu Wada

  2009, PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, SUPPL 1, 6, S146 - S149, English

  [Refereed]

  International conference proceedings


• Narrow-band deep-ultraviolet light emitting device using Al(1-x)Gd(x)N

  Takashi Kita, Shinya Kitayama, Masashi Kawamura, Osamu Wada, Yoshitaka Chigi, Yoshihiro Kasai, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi

  Nov. 2008, APPLIED PHYSICS LETTERS, 93(21) (21), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Ultrafast All-Optical Control of Excitons Confined in GaAs Thin Films

  Osamu Kojima, Ayumi Miyagawa, Takashi Kita, Osamu Wada, Toshiro Isu

  Nov. 2008, APPLIED PHYSICS EXPRESS, 1(11) (11), English

  [Refereed]

  Scientific journal


• Effects of indium segregation on optical properties of nitrogen-doped InAs/GaAs quantum dots

  Tomoya Inoue, Masataka Mamizuka, Hiroshi Mizuno, Osamu Kojima, Takashi Kita, Osamu Wada

  Nov. 2008, JOURNAL OF APPLIED PHYSICS, 104(10) (10), English

  [Refereed]

  Scientific journal


• Real time analysis of self-assembled InAs/GaAs quantum dot growth by probing reflection high-energy electron diffraction chevron image

  Takuya Kudo, Tomoya Inoue, Takashi Kita, Osamu Wada

  Oct. 2008, JOURNAL OF APPLIED PHYSICS, 104(7) (7), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Anisotropic magneto-optical effects in CdTe/Cd(0.75)Mn(0.25)Te quantum wire structures

  Yukihiro Harada, Takashi Kita, Osamu Wada, Hiroaki Ando, Henri Mariette

  Aug. 2008, PHYSICAL REVIEW B, 78(7) (7), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Flexible field emission device using carbon nanofiber nanocomposite sheet

  Masashi Kawamura, Yusuke Tanaka, Takashi Kita, Osamu Wada, Hironao Nakamura, Hisao Yanagi, Akira Magario, Toru Noguchi

  Jul. 2008, APPLIED PHYSICS EXPRESS, 1(7) (7), English

  [Refereed]

  Scientific journal


• Side electron emission device using carbon nanofiber/elastomer composite sheet

  Hironao Nakamura, Hisao Yanagi, Takashi Kita, Akira Magario, Toru Noguchi

  Jun. 2008, APPLIED PHYSICS LETTERS, 92(24) (24), English

  [Refereed]

  Scientific journal


• Photoluminescence characteristics of quantum dots with electronic states interconnected along growth direction

  Osamu Kojima, Hiroaki Nakatani, Takashi Kita, Osamu Wada, Kouichi Akahane, Masahiro Tsuchiya

  Jun. 2008, JOURNAL OF APPLIED PHYSICS, 103(11) (11), English

  [Refereed]

  Scientific journal


• Fine structure splitting of isoelectronic bound excitons in nitrogen-doped GaAs

  Takashi Kita, Yukihiro Harada, Osamu Wada

  May 2008, PHYSICAL REVIEW B, 77(19) (19), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Dual chopped photoreflectance spectroscopy for nondestructive characterization of semiconductors and semiconductor nanostructures

  Takashi Kita, Masahiro Yamada, Osamu Wada

  Apr. 2008, REVIEW OF SCIENTIFIC INSTRUMENTS, 79(4) (4), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Photoluminescence dynamics of coupled quantum dots

  Nakatani Hiroaki, Kita Takashi, Kojima Osamu, Wada Osamu, Akahane Kouichi, Tsuchiya Masahiro

  Mar. 2008, Journal of Luminescence, Vol 128. No. 5-6, pp. 975-977, English

  [Refereed]

  Scientific journal


• EXCITON FINE STRUCTURE OF NITROGEN ISOELECTRONIC CENTERS IN GaAs

  Yukihiro Harada, Takashi Kita, Osamu Wada

  2008, 2008 IEEE 20TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE AND RELATED MATERIALS (IPRM), 231 - 233, English

  [Refereed]

  International conference proceedings


• Electron tomography of embedded semiconductor quantum dot

  Tomoya Inoue, Takashi Kita, Osamu Wada, Mitsuru Konno, Toshie Yaguchi, Takeo Kamino

  Jan. 2008, APPLIED PHYSICS LETTERS, 92(3) (3), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Narrowband ultraviolet field-emission device using Gd-doped AlN

  Shinya Kitayama, Takashi Kita, Masashi Kawamura, Osamu Wada, Yoshitaka Chigi, Yoshihiro Kasai, Tetsuro Nishimoto, Hiroyuki Tanaka, Mikihiro Kobayashi

  2008, IUMRS-ICA 2008 SYMPOSIUM AA. RARE-EARTH RELATED MATERIAL PROCESSING AND FUNCTIONS, 1, English

  [Refereed]

  International conference proceedings


• Investigation of nitrided InAs/GaAs self-assembled quantum dots

  Xunzhong Shang, K. Matsushita, T. Inoue, T. Kita, O. Wada, H. Yasuda, H. Mori

  May 2007, Guti Dianzixue Yanjiu Yu Jinzhan/Research and Progress of Solid State Electronics, 27(2) (2), 151 - 153, Chinese

  Scientific journal


• Atomically controlled doping of nitrogen on GaAs(001) surfaces

  N. Shimizu, T. Inoue, T. Kita, O. Wada

  Apr. 2007, JOURNAL OF CRYSTAL GROWTH, 301, 34 - 37, English

  [Refereed]

  Scientific journal


• Emission-wavelength extension of nitrided InAs/GaAs quantum dots with different sizes

  H. Mizuno, T. Inoue, M. Kikuno, T. Kita, O. Wada, H. Mori, H. Yasuda

  Apr. 2007, JOURNAL OF CRYSTAL GROWTH, 301, 709 - 712, English

  [Refereed]

  Scientific journal


• Multidirectional transmission electron microscope observation of a single InAs/GaAs self-assembled quantum dot

  T. Inoue, T. Kita, O. Wada, M. Konno, T. Yaguchi, T. Kamino

  2007, 2007 INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE AND RELATED MATERIALS, CONFERENCE PROCEEDINGS, 579 - 581, English

  [Refereed]

  International conference proceedings


• Confined electronic structures of nitrogen isoelectronic centers in GaAs grown by atomically controlled doping technique

  Takashi Kita, Osamu Wada

  2007, PHYSICS OF SEMICONDUCTORS, PTS A AND B, 893, 249 - +, English

  [Refereed]

  International conference proceedings


• Anisotropic magnetic-field evolution of valence-band states in one-dimensional diluted magnetic semiconductors

  Yukihiro Harada, Takashi Kita, Osamu Wada, Hiroaki Ando

  2007, PHYSICS OF SEMICONDUCTORS, PTS A AND B, 893, 1245 - +, English

  [Refereed]

  International conference proceedings


• Real time probing of self-assembling process steps in InAs/GaAs quantum dot growth

  Takuya Kudo, Tomoya Inoue, Takashi Kita, Osamu Wada

  2007, 2007 INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE AND RELATED MATERIALS, CONFERENCE PROCEEDINGS, 303 - 306, English

  [Refereed]

  International conference proceedings


• Multidirectional observation of an embedded quantum dot

  Takashi Kita, Tomoya Inoue, Osamu Wada, Mitsuru Konno, Toshie Yaguchi, Takeo Kamino

  Jan. 2007, APPLIED PHYSICS LETTERS, 90(4) (4), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Bright electron emission from Si-doped AIN thin films

  A. Kishimoto, Y. Inou, T. Kita, O. Wada

  2007, PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 4 NO 7 2007, 4(7) (7), 2490 - +, English

  [Refereed]

  International conference proceedings


• Control of optical emission from coupled excitonic states in quantum dot superlattice structures

  H. Nakatani, T. Kita, O. Kojima, O. Wada, K. Akahane, M. Tsuchiya

  2007, 2007 INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE AND RELATED MATERIALS, CONFERENCE PROCEEDINGS, pp. 197-200, 197 - 200, English

  [Refereed]

  International conference proceedings


• Anisotropic magneto-optical effects in one-dimensional diluted magnetic semiconductors

  Yukihiro Harada, Takashi Kita, Osamu Wada

  Dec. 2006, PHYSICAL REVIEW B, 74(24) (24), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• High-brightness electron emission from flexible carbon nanotube/elastomer nanocomposite sheets

  Takashi Kita, Yosuke Hayashi, Osamu Wada, Hisao Yanagi, Yasufumi Kawai, Akira Magario, Toru Noguchi

  Nov. 2006, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 45(42-45) (42-45), L1186 - L1189, English

  [Refereed]

  Scientific journal


• Carbon nanotube/aluminum composites as a novel field electron emitter

  Hisao Yanagi, Yasufumi Kawai, Takashi Kita, Shunsuke Fujii, Yousuke Hayashi, Akira Magario, Toru Noguchi

  Jul. 2006, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 45(24-28) (24-28), L650 - L653, English

  [Refereed]

  Scientific journal


• Bound exciton states of isoelectronic centers in GaAs : N grown by an atomically controlled doping technique

  Takashi Kita, Osamu Wada

  Jul. 2006, PHYSICAL REVIEW B, 74(3) (3), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Artificial control of optical gain polarization by stacking quantum dot layers

  T Kita, N Tamura, O Wada, M Sugawara, Y Nakata, H Ebe, Y Arakawa

  May 2006, APPLIED PHYSICS LETTERS, 88(21) (21), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Magnetic field-sensitive polarization anisotropy in one-dimensional diluted magnetic semiconductors

  Y. Harada, T. Kita, O. Wada, H. Ando

  2006, Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006, English

  [Refereed]

  International conference proceedings


• Valence-band mixing induced by sp-d exchange interaction in CdMnTe quantum wires

  Y. Harada, T. Kita, O. Wada, L. Marsal, H. Mariette, H. Ando

  2006, Physica Status Solidi C: Conferences, 3(3) (3), 667 - 670, English

  [Refereed]

  International conference proceedings


• Emission-wavelength extension of InAs/GaAs quantum dots by controlling lattice-mismatch strain

  T. Inoue, K. Matsushita, M. Kikuno, T. Kita, O. Wada, H. Mori, H. Yasuda

  2006, 2006 INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE AND RELATED MATERIALS CONFERENCE PROCEEDINGS, 201 - +, English

  [Refereed]

  International conference proceedings


• Valence-band mixing induced by sp-d exchange interaction in CdMnTe quantum wires

  Y Harada, T Kita, O Wadal, L Marsal, H Mariette, H Ando

  2006, PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3 NO 3, 3(3) (3), 667 - +, English

  [Refereed]

  International conference proceedings


• Electronic structure of ordered Ga0.5In0.5P/GaAs heterointerface studied by Raman-scattering and photoluminescence-excitation measurements

  K Yamashita, K Oe, T Kita, O Wada, Y Wang, C Geng, F Scholz, H Schweizer

  Oct. 2005, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 44(10) (10), 7390 - 7394, English

  [Refereed]

  Scientific journal


• Order-parameter dependence of spontaneous electron accumulation at Ga 0.5In 0.5P/GaAs studied by raman-scattering and photoluminescence measurements

  K. Yamashita, K. Oe, T. Kita, O. Wada, Y. Wang, C. Geng, F. Scholz, H. Schweizer

  Jun. 2005, AIP Conference Proceedings, 772, 387 - 388, English

  [Refereed]

  International conference proceedings


• Optical polarization properties of InAs/GaAs quantum dot semiconductor optical amplifier

  P Jayavel, T Kita, O Wada, H Ebe, M Sugawara, Y Arakawa, Y Nakata, T Akiyama

  Apr. 2005, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 44(4B) (4B), 2528 - 2530, English

  [Refereed]

  Scientific journal


• 形状制御した量子ドットによる偏光無依存吸収端の実現

  喜多 隆, 和田 修, 中田 義昭

  Mar. 2005, 日本学術振興会科学研究費補助金・基盤研究(B)(2),平成16年度研究実績報告書, Japanese

  [Refereed]

  Scientific journal


• Anisotropic exchange interaction caused by hole-spin reorientation in (CdTe)(0.5)(Cd0.75Mn0.25Te)(0.5) tilted superlattices grown on Cd0.74Mg0.26Te(001) vicinal surface

  T. Kita, S. Nagahara, R. Naganuma, Y. Harada, O. Wada, L. Marsal, H. Mariette

  Feb. 2005, JOURNAL OF CRYSTAL GROWTH, 275(1-2) (1-2), E2221 - E2224, English

  [Refereed]

  Scientific journal


• Valence-band mixing in CdTe/CdMnTe nano-wire structures in magnetic field

  Y. Harada, R. Naganuma, T. Kita, O. Wada, H. Mariette, H. Ando

  2005, IQEC, International Quantum Electronics Conference Proceedings, 2005, 265 - 266, English

  [Refereed]

  International conference proceedings


• Bound-exciton luminescence from nitrogen doped GaAs grown by site-controlled doping technique

  Takashi Kita, Osamu Wada

  2005, IQEC, International Quantum Electronics Conference Proceedings, 2005, 261 - 262, English

  [Refereed]

  International conference proceedings


• Mechanism of emission-wavelength extension in nitrided InAs/GaAs quantum dots

  K Matsushita, Inoue, I, XZ Shang, T Mori, H Seki, M Kikuno, T Kita, O Wada, H Mori, T Sakata, H Yasuda

  2005, 2005 International Conference on Indium Phosphide and Related Materials, 52 - 55, English

  [Refereed]

  International conference proceedings


• Wavelength control of nitrided InAs/GaAs quantum dots in fiber-optic communication region

  M Kikuno, T Mori, H Seki, K Matsusita, T Kita, O Wada

  2005, 2005 International Conference on Indium Phosphide and Related Materials, 355 - 358, English

  [Refereed]

  International conference proceedings


• Ultrafast anisotropic processes of exciton magnetic polarons in CdTe/CdMnTe quantum wires

  R Naganuma, T Kita, S Nagahara, O Wada, L Marsal, H Mariette

  2005, ULTRAFAST PHENOMENA XIV, 79, 263 - 265, English

  [Refereed]

  International conference proceedings


• Extended wavelength emission to 1.3 mu m in nitrided InAs/GaAs self-assembled quantum dots

  T Kita, T Mori, H Seki, M Matsushita, M Kikuno, O Wada, H Ebe, M Sugawara, Y Arakawa, Y Nakata

  Jan. 2005, JOURNAL OF APPLIED PHYSICS, 97(2) (2), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Hole-spin reorientation in (CdTe)(0.5)(Cd0.75Mn0.25Te)(0.5) tilted superlattices grown on Cd0.74Mg0.26Te(001) vicinal surface

  T Kita, S Nagahara, Y Harada, O Wada, L Marsal, H Mariette

  2005, Physics of Semiconductors, Pts A and B, 772, 1353 - 1354, English

  [Refereed]

  International conference proceedings


• Anisotropic magneto-optical effects in (CdTe)0.5(Cd 0.75Mn0.25Te)0.5 tilted superlattices

  Seiji Nagahara, Takashi Kita, Osamu Wada, Laurent Marsal, Henri Mariette

  Jun. 2004, Physical Review B - Condensed Matter and Materials Physics, 69(23) (23), 1 - 233308, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Anisotropic magneto-optical effects in (CdTe)(0.5)(Cd0.75Mn0.25Te)(0.5) tilted superlattices

  S Nagahara, T Kita, O Wada, L Marsal, H Mariette

  Jun. 2004, PHYSICAL REVIEW B, 69(23) (23), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Control of InxGa1-xAs capping layer induced optical polarization in edge-emitting photoluminescence of InAs quantum dots

  P Jayavel, H Tanaka, T Kita, O Wada, H Ebe, M Sugawara, J Tatebayashi, Y Arakawa, Y Nakata, T Akiyama

  Apr. 2004, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 43(4B) (4B), 1978 - 1980, English

  [Refereed]

  Scientific journal


• Control of optical polarization anisotropy in edge emitting luminescence of InAs/GaAs self-assembled quantum dots

  P Jayavel, H Tanaka, T Kita, O Wada, H Ebe, M Sugawara, J Tatebayashi, Y Arakawa, Y Nakata, T Akiyama

  Mar. 2004, APPLIED PHYSICS LETTERS, 84(11) (11), 1820 - 1822, English

  [Refereed]

  Scientific journal


• Anisotropic exchange interaction in CdTe/Cd0.75Mn0.25Te quantum wires

  S Nagahara, Y Matsuura, R Naganuma, T Kita, O Wada, L Marsal, H Mariette

  Mar. 2004, PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 21(2-4) (2-4), 345 - 348, English

  [Refereed]

  Scientific journal


• Spin control in diluted magnetic ion doped nano-wire structures

  Seiji Nagahara, Takashi Kita, Osamu Wada, Henri Mariette

  Society of Materials Science Japan, 2004, Zairyo/Journal of the Society of Materials Science, Japan, 53(12) (12), 1346 - 1350, Japanese

  [Refereed]

  Scientific journal


• 半導体量子ナノ構造のスピンエレクトロニクス応用

  喜多 隆

  2004, 神戸大学版ベンチャー・ビジネス・ラボラトリー年報, VOL.9,102-107, Japanese

  [Refereed]

  Scientific journal


• フォトニクスマテリアル量子ナノ構造におけるスピン制御

  喜多 隆, 和田 修

  2004, 神戸大学版ベンチャー・ビジネス・ラボラトリー年報, VOL.9,6-13, Japanese

  [Refereed]

  Scientific journal


• Long-wavelength emission from nitridized InAs quantum dots

  T Kita, Y Masuda, T Mori, O Wada

  Nov. 2003, APPLIED PHYSICS LETTERS, 83(20) (20), 4152 - 4153, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Fourier transformed photoreflectance characterization of interface electric fields in GaAs/GaInP heterojunction bipolar transistor wafers

  T Kita, T Kakutani, O Wada, T Tsuchiya, M Sahara, H Sakaguchi

  Nov. 2003, JOURNAL OF APPLIED PHYSICS, 94(10) (10), 6487 - 6490, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Strain effects on photoluminescence polarization of InAs/GaAs self-assembled quantum dots

  P Jayavel, H Tanaka, K Kou, T Kita, O Wada, H Ebe, Y Nakata, M Sugawara

  Jul. 2003, PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 238(2) (2), 229 - 232, English

  [Refereed]

  Scientific journal


• Transition with a hysteresis cycle in surface reconstruction on GaAs(001) observed by optical reflectance spectroscopy

  T Kita, M Nakamoto, O Wada

  May 2003, PHYSICAL REVIEW B, 67(19) (19), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Femtosecond response of diffraction efficiency of GaAs/AlGaAs photorefractive multiple quantum well

  H Tanaka, K Terawaki, K Kou, S Tsuboi, S Nagahara, T Kita, O Wada, K Nakagawa, DD Nolte

  Apr. 2003, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 42(4B) (4B), 2329 - 2331, English

  [Refereed]

  Scientific journal


• 形状制御量子ドットによる超高速・高非線形光学応答の同時実現

  和田 修, 喜多 隆, 菅原 充

  Mar. 2003, 日本学術振興会科学研究費補助金・基盤研究(B)(2),平成14年度研究成果報告書, 未記入, Japanese

  [Refereed]

  Scientific journal


• Excitonic states in (formula presented) quantum wires grown on vicinal substrates

  Seiji Nagahara, Takashi Kita, Osamu Wada, Laurent Marsal, Henri Mariette

  Feb. 2003, Physical Review B - Condensed Matter and Materials Physics, 67(8) (8), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Excitonic states in CdTe/Cd0.74Mg0.26Te quantum wires grown on vicinal substrates

  Seiji Nagahara, Takashi Kita, Osamu Wada, Laurent Marsal, Henri Mariette

  Feb. 2003, Physical Review B - Condensed Matter and Materials Physics, 67(8) (8), 853011 - 853017, English

  Scientific journal


• Excitonic states in CdTe/Cd0.74Mg0.26Te quantum wires grown on vicinal substrates

  S Nagahara, T Kita, O Wada, L Marsal, H Mariette

  Feb. 2003, PHYSICAL REVIEW B, 67(8) (8), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Temperature dependence of GaAs1-xBix band gap studied by photoreflectance spectroscopy

  J Yoshida, T Kita, O Wada, K Oe

  Feb. 2003, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 42(2A) (2A), 371 - 374, English

  [Refereed]

  Scientific journal


• Wideband polarization insensitivity in quantum dot optical amplifier

  T. Kita, P. Jayavel, H. Tanaka, K. Kho, O. Wada, Y. Nakata, T. Akiyama, H. Ehe, M. Sugawara, J. Tatebayashi, Y. Arakawa

  Optical Society of American (OSA), 2003, OSA Trends in Optics and Photonics Series, 88, 534 - 535, English

  International conference proceedings


• Novel characterization technique for GaAs/GaInP heterojunction bipolar transistor wafers based on Fourier transformed photoreflectance enabling selective determination of interface electric fields

  T Kita, T Kakutani, O Wada, T Tsuchiya, M Sahara, H Sakaguchi

  2003, 2003 INTERNATIONAL CONFERENCE INDIUM PHOSPHIDE AND RELATED MATERIALS, CONFERENCE PROCEEDINGS, 531 - 533, English

  [Refereed]

  International conference proceedings


• Polarization controlled edge emission from columnar InAs/GaAs self-assembled quantum dots

  T Kita, P Jayavel, O Wada, H Ebe, Y Nakata, M Sugawara

  2003, 2ND INTERNATIONAL CONFERENCE ON SEMICONDUCTOR QUANTUM DOTS, 0(4),1137-1140, 1137 - 1140, English

  [Refereed]

  International conference proceedings


• One-dimensional free exciton in CdTe/Cd0.74Mg0.26Te quantum wires

  S Nagahara, T Kita, O Wada, L Marsal, H Mariette

  2003, COMPOUND SEMICONDUCTORS 2002, 174, 173 - 177, English

  [Refereed]

  Scientific journal


• GaAs/AlGaAsフォトリフラクティブ多重量子井戸のフェムト秒光回析

  喜多 隆, 和田 修

  2003, 神戸大学ベンチャー・ビジネス・ラボラトリー年報2003, Vol.8,pp.5-14, Japanese

  [Refereed]


• CdTe/CdMnTe量子細線における磁気光学特性の異方性

  喜多 隆, 和田 修

  2003, 神戸大学ベンチャー・ビジネス・ラボラトリー年報2003, Vol.8,pp.126-129, Japanese

  [Refereed]


• Magnetophotoluminescence study of the Ga0.5In0.5P/GaAs heterointerface with a ordering-induced two-dimensional electron gas

  K. Yamashita, T. Kita, Y. Matsuura, O. Wada, C. Geng, F. Scholz, H. Schweizer, K. Oe

  Nov. 2002, Physical Review B - Condensed Matter and Materials Physics, 66(19) (19), 1953171 - 1953177

  [Refereed]

  Scientific journal


• Optical reflectance study of the wetting layers in (In, Ga)As self-assembled quantum dot growth on GaAs (001)

  Takashi Kita, Osamu Wada, T. Nakayama, M. Murayama

  Nov. 2002, Physical Review B - Condensed Matter and Materials Physics, 66, 1953121 - 1953126

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Optical reflectance study of the wetting layers in (In, Ga)As self-assembled quantum dot growth on GaAs (001)

  Kita Takashi, Wada Osamu, Nakayama T., Murayama M.

  American Physical Society (APS), Nov. 2002, Physical Review B, 66(19) (19), 195312 - 195312, English

  [Refereed]


• Magnetophotoluminescence study of the Ga0.5In0.5P/GaAs heterointerface with a ordering-induced two-dimensional electron gas

  K Yamashita, T Kita, Y Matsuura, O Wada, C Geng, F Scholz, H Schweizer, K Oe

  Nov. 2002, PHYSICAL REVIEW B, 66(19) (19), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Polarization-independent photoluminescence from columnar InAs/GaAs self-assembled quantum dots

  T Kita, O Wada, H Ebe, Y Nakata, M Sugawara

  Oct. 2002, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 41(10B) (10B), L1143 - L1145, English

  [Refereed]

  Scientific journal


• Theory of propagation and scattering of exciton-polaritons in quantum wells

  S. Nagahara, T. Kita, O. Wada, L. Marsal, H. Mariette

  Apr. 2002, Physica Status Solidi (A) Applied Research, 190(3) (3), 703 - 707, English

  [Refereed]

  International conference proceedings


• Radiative lifetimes of excitons in CdMgTe/CdTe tilted superlattices grown on vicinal surfaces

  S Nagahara, T Kita, O Wada, L Marsal, H Mariette

  Apr. 2002, PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 190(3) (3), 699 - 702, English

  [Refereed]

  Scientific journal


• Two-dimensional electron gas at Ga0.5In0.5P/GaAs heterointerface spontaneously induced by atomic ordering

  K Yamashita, T Kita, O Wada, Y Wang, K Murase, C Geng, F Scholz, H Schweizer

  Mar. 2002, PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 13(2-4) (2-4), 329 - 332, English

  [Refereed]

  Scientific journal


• High-density electron gas induced by atomic ordering in undoped Ga0.5In0.5P/GaAs heterostructure

  K. Yamashita, Y. Matsuura, T. Kita, O. Wada, C. Geng, F. Scholz, H. Schweizer

  2002, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 515 - 518

  [Refereed]

  International conference proceedings


• Magnetophotoluminescence study of the (formula presented) heterointerface with a ordering-induced two-dimensional electron gas

  K. Yamashita, T. Kita, Y. Matsuura, O. Wada, C. Geng, F. Scholz, H. Schweizer, K. Oe

  2002, Physical Review B - Condensed Matter and Materials Physics, 66(19) (19), 1 - 7, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Biexciton formation in CdTe/Cd0.74Mg0.26Te quantum wires

  S Nagahara, T Kita, O Wada, L Marsal, H Mariette

  2002, COMPOUND SEMICONDUCTORS 2001, (170) (170), 519 - 524, English

  [Refereed]

  Scientific journal


• Stranski-Krastanov growth of (In,Ga)As quantum dots by controlling the wetting layer

  T Kita, M Nakahama, K Yamashita, O Wada

  2002, COMPOUND SEMICONDUCTORS 2001, (170) (170), 525 - 530, English

  [Refereed]

  Scientific journal


• Optical reflectance study of the wetting layers in (In, Ga)As self-assembled quantum dot growth on GaAs (formula presented)

  Takashi Kita, Osamu Wada, T. Nakayama, M. Murayama

  Jan. 2002, Physical Review B - Condensed Matter and Materials Physics, 66, 1 - 6

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Optical properties of tilted II-VI superlattices grown on vicinal surfaces

  L. Marsal, A. Wasiela, G. Fishman, H. Mariette, F. Michelini, S. Nagahara, T. Kita

  Apr. 2001, Physical Review B - Condensed Matter and Materials Physics, 63(16) (16), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Inelastic phonon scattering in long-range-ordered (Al0.5Ga0.5)0.5In0.5P

  T. Kita, K. Yamashita, T. Nishino, Y. Wang, K. Murase

  Mar. 2001, Physical Review B - Condensed Matter and Materials Physics, 63(12) (12), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Optical Characterization of CVD-Diamond Films

  Takashi Kita, Seiji Nagahara, Taneo Nishino

  2001, New Diamond and Frontier Carbon Technology, 11(5) (5), 339 - 345, English

  Scientific journal


• Plasmon-phonon coupling at Ga0.5In0.5P/GaAs heterointerfaces induced by CuPt-type ordering

  K Yamashita, T Kita, T Nishino, Y Wang, K Murase, C Geng, F Scholz, H Schweizer

  2001, PROCEEDINGS OF THE 25TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, PTS I AND II, 87, 453 - 454, English

  [Refereed]

  International conference proceedings


• Optical anisotropy of Stranski-Krastanov growth surface of InAs on GaAs (001)

  T Kita, H Tango, K Tachikawa, K Yamashita, T Nishino, T Nakayama, M Murayama

  2001, PROCEEDINGS OF THE 25TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, PTS I AND II, 87, 365 - 366, English

  [Refereed]

  International conference proceedings


• Reflectance-difference spectroscopy of (001) InAs surfaces in ultrahigh vacuum

  T Kita, H Tango, K Tachikawa, K Yamashita, T Nishino

  2001, PROCEEDINGS OF THE 25TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, PTS I AND II, 87, 353 - 354, English

  [Refereed]

  International conference proceedings


• Energy relaxation by phonon scattering in long-range ordered (Al0.5Ga0.5)(0.5)In0.5P

  T Kita, K Yamashita, T Nishino, Y Wang, K Murase

  2001, PROCEEDINGS OF THE 25TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, PTS I AND II, 87, 218 - 219, English

  [Refereed]

  International conference proceedings


• Internal electric field effects at ordered Ga0.5In0.5P/GaAs heterointerface investigated by photoreflectance spectroscopy

  K. Yamashita, N. Nishida, T. Kakutani, T. Kita, Y. Wang, K. Murase, C. Geng, F. Scholz, H. Schweizer

  2001, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 330 - 333

  [Refereed]

  International conference proceedings


• Self-assembled growth of InAs-quantum dots and postgrowth behavior studied by reflectance-difference spectroscopy

  T. Kita, K. Tachikawa, H. Tango, K. Yamashita, T. Nishino

  Jun. 2000, Applied Surface Science, 159, 503 - 507

  [Refereed]

  Scientific journal


• Dynamic process of two-dimensional InAs growth in Stranski-Krastanov mode

  T. Kita, K. Yamashita, H. Tango, T. Nishino

  May 2000, Physica E: Low-Dimensional Systems and Nanostructures, 7(3) (3), 891 - 895

  [Refereed]

  Scientific journal


• Optical characterization of synthetic diamond films

  Takashi Kita, Seiji Nagahara, Taneo Nishino

  SPIE, 2000, Proceedings of SPIE - The International Society for Optical Engineering, 4086, 535 - 539, English

  International conference proceedings


• Cooling Process of Hot Excitons in Ordered Ga_0.5In_0.5P

  T. Kita, M. Sakurai, K. Yamashita, T. Nishino, C. Geng, F. Scholz, H. Schweizer

  IOP Publishing, Jan. 2000, Japanese Journal of Applied Physics, 39(S1) (S1), 328 - 328

  Scientific journal


• Interdiffusion effects at long-range ordered Ga0.5In0.5P and GaAs heterointerfaces

  K. Yamashita, T. Kita, T. Nishino, Y. Wang, K. Murase, C. Geng, F. Scholz, H. Schweizer

  2000, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 154 - 157

  [Refereed]

  Scientific journal


• Diffraction property of ultrashort laser pulses in photorefractive multiple quantum wells

  Kiyoshi Nakagawa, Takumi Minemoto, Takashi Kita, Kenitchi Yamashita, Taneo Nishino, Mihaela Dinu, Davidd Nolte, Michaelr Melloch

  2000, Proceedings of SPIE - The International Society for Optical Engineering, 4110, 9 - 16, English

  [Refereed]

  Scientific journal


• Carrier-Relaxation Process in Time-Resolved Up-Converted Photoluminescence at Ordered (Al0.5Ga0.5)0.5In0.5P and GaAs Heterointerface

  Yamashita Kenichi, Kita Takashi, Nishino Taneo, Oestreich Michael

  Up-converted photoluminescence (UPL) was observed at thelong-range ordered (Al0.5Ga0.5)0.5In0.5P/GaAs(001)heterointerface, during the excitation of GaAs. Excitation-powerdependence of the UPL intensity reflects carrier-localizationproperties caused by potential fluctuations due to a multidomainstructure in the ordered(Al0.5Ga0.5)0.5In0.5P. When we excited the GaAslayer, photoexcited carriers spatially transferred to the(Al0.5Ga0.5)0.5In0.5P layer and relaxed fromhigher lying states to lower lying states in the fluctuatedpotential. Time-resolved measurements were performed for the UPL andnormal photoluminescence (NPL) excited by an above-gap light. Weobserved a slowly rising component in the time-resolved UPL, whereasthe NPL showed an exponential decay profile. These results revealthat the carrier-relaxation processes are different near the surfaceand near the interface of the epitaxial layer.

  The Japan Society of Applied Physics, Feb. 1999, Jpn J Appl Phys, 38(2) (2), 1001 - 1003, English

  [Refereed]


• Energy relaxation by multiphonon processes in partially ordered (Al0.5Ga0.5)0.5In0.5P

  T. Kita, M. Sakurai, K. Yamashita, T. Nishino

  1999, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 159 - 162

  [Refereed]

  Scientific journal


• Linear electrooptic effect in ordered (Al0.5Ga0.5)0.5In0.5P

  Kenichi Yamashita, Takashi Kita, Taneo Nishino

  American Institute of Physics Inc., 1999, Journal of Applied Physics, 86(6) (6), 3140 - 3143, English

  [Refereed]

  Scientific journal


• Dynamic process of anti-stokes photoluminescence at a long-range-ordered (formula presented) heterointerface

  Takashi Kita, Taneo Nishino, H. Schweizer

  1999, Physical Review B - Condensed Matter and Materials Physics, 59(23) (23), 15358 - 15362, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Carrier localization effects in energy up conversion at ordered (Al0.5Ga0.5)0.5In0.5P/GaAs heterointerface

  Kenichi Yamashita, Takashi Kita, Taneo Nishino

  American Institute of Physics Inc., Jul. 1998, Journal of Applied Physics, 84(1) (1), 359 - 363, English

  [Refereed]

  Scientific journal


• Efficiency of photoluminescence up-conversion at (Al0.5Ga0.5)0.5In0.5P and GaAs heterointerface

  Kenichi Yamashita, Takashi Kita, Taneo Nishino, Michael Oestreich

  1998, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 521 - 524

  [Refereed]

  International conference proceedings


• Spin-polarized excitons in long-range ordered Ga0.5In0.5P

  T. Kita, K. Bhattacharya, K. Yamashita, T. Nishino, C. Geng, F. Scholz, H. Schweizer

  1998, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 525 - 528

  [Refereed]

  International conference proceedings


• Quantum approach of vapor phase growth mechanism of diamond film

  Wei Guang-Pu, T. Kita, H. Hakayama, T. Nishino

  1998, Proceedings of SPIE - The International Society for Optical Engineering, 3175, 465 - 469, English

  [Refereed]

  International conference proceedings


• Spin polarization of exciton luminescence from ordered

  T. Kita, M. Sakurai, K. Bhattacharya, K. Yamashita, T. Nishino, C. Geng, F. Scholz, H. Schweizer

  1998, Physical Review B - Condensed Matter and Materials Physics, 57(24) (24), R15044 - R15047, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Single-electron tunneling in granular Ag-SiO2 films

  Minoru Fujii, Takashi Kita, Keiichi Yamamoto, Shinji Hayashi

  Jan. 1998, Superlattices and Microstructures, 23(1) (1), 173 - 176

  [Refereed]

  Scientific journal


• Stochastic growth theory of molecular beam epitaxy with atom correlation effects: A Monte-Carlo master equation method

  Hiroshi Nakayama, Akihisa Furuichi, Takashi Kita, Taneo Nishino

  Elsevier, 1997, Applied Surface Science, 113-114, 631 - 637, English

  [Refereed]

  Scientific journal


• Photoluminescence from metastable states in long-range orderP

  Kenichi Yamashita, Takashi Kita, Hiroshi Nakayama, Taneo Nishino

  1997, Physical Review B - Condensed Matter and Materials Physics, 55(7) (7), 4411 - 4416, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• The optical processes in AlInP/GaInP/AlInP quantum wells

  Yoshihiro Ishitani, Shigekazu Minagawa, Takashi Kita, Taneo Nishino, Hiroyuki Yaguchi, Yasuhiro Shiraki

  Oct. 1996, Journal of Applied Physics, 80(8) (8), 4592 - 4598

  [Refereed]

  Scientific journal


• Electron-beam electroreflectance spectroscopy of semiconductors

  Takashi Kita, Taneo Nishino

  Japan Society of Applied Physics, 1996, Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 35(10) (10), 5367 - 5373, English

  Scientific journal


• Higher-interband electroreflectance of long-range ordereP

  Takashi Kita, Kenichi Yamashita, Taneo Nishino

  1996, Physical Review B - Condensed Matter and Materials Physics, 54(23) (23), 16714 - 16718, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Direct optical transitions in indirect-gP by atomic ordering

  Kenichi Yamashita, Takashi Kita, Hiroshi Nakayama, Taneo Nishino

  1996, Physical Review B - Condensed Matter and Materials Physics, 53(23) (23), 15713 - 15718, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Photocurrent polarization in long-range ordered Ga0.5In0.5P

  Takashi Kita, Akira Fujiwara, Hiroshi Nakayama, Taneo Nishino

  American Inst of Physics, Apr. 1995, Applied Physics Letters, 66(14) (14), 1794 - 1796, English

  [Refereed]

  Scientific journal


• Anisotropic photocurrent in long-range ordered Ga0.5In0.5P

  Takashi Kita, Akira Fujiwara, Hiroshi Nakayama, Taneo Nishino

  IEEE, 1995, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 257 - 260, English

  International conference proceedings


• Theoretical analysis of photoacoustic displacement for inhomogeneous materials

  Hiroyuki Takamatsu, Shingo Sumie, Tsutomu Morimoto, Yutaka Kawata, Yoshiro Nishimoto, Takefumi Horiuchi, Hiroshi Nakayama, Takashi Kita, Taneo Nishino

  JJAP, Oct. 1994, Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 33(10) (10), 6032 - 6038, English

  Scientific journal


• Resonant coupling between confined and unconfined states in a finite-period In0.24Ga0.76As/GaAs strained-layer superlattice

  Takashi Kita, Tomoko Inazumi, Hiroshi Nakayama, Taneo Nishino, Harunori Sakaguchi

  1994, Physical Review B, 50(4) (4), 2420 - 2424, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Analysis of lattice defects induced by ion implantation with photo-acoustic displacement measurements

  Shingo Sumie, Hiroyuki Takamatsu, Tsutomu Morimoto, Yoshiro Nishimoto, Yutaka Kawata, Takefumi Horiuchi, Hiroshi Nakayama, Takashi Kita, Taneo Nishino

  1994, Journal of Applied Physics, 76(10) (10), 5681 - 5689, English

  [Refereed]

  Scientific journal


• Photoluminescence and Photoreflectance Study of Electronic Structure in Pseudomorphic n-AlGaAs/InGaAs/GaAs

  Kanata Takashi, Nakayama Hiroshi, Nishino Taneo, Sakaguchi Harunori

  The electronic structure of n-Al0.28Ga0.72As/In0.23Ga0.77As/GaAs has been investigated by photoluminescence (PL) and photoreflectance (PR) spectroscopies. Transitions associated with the $n{=}1$ and 2 electron subbands in the In0.23Ga0.77As single quantum well were observed. Two-dimensional carrier density was evaluated in terms of the quantum confined Franz-Keldysh (FK) effect of the transition between the lowest states of electrons and heavy holes. Because of penetrations of the confined electron density into the neighboring layers, PR spectra of GaAs show FK oscillation.

  The Japan Society of Applied Physics, Jun. 1992, Jpn J Appl Phys, 31(6) (6), L756 - L758, English

  [Refereed]

• 8aAJ-6 Upconversion photoluminescence in GaAs/AlAs multiple quantum wells

  Kojima O., Okumura S., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 22 Aug. 2014, Meeting abstracts of the Physical Society of Japan, 69(2) (2), 514 - 514, Japanese


• 27aAU-9 Control of exciton quantum beat in a multiple quantum well at higher temperature

  Kojima O, Kita T., Akahane K.

  The Physical Society of Japan (JPS), 05 Mar. 2014, Meeting abstracts of the Physical Society of Japan, 69(1) (1), 689 - 689, Japanese


• Effects of phonons on ultrafast response due to quantum beat oscillation

  Kojima O., Kojima K., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 26 Aug. 2013, Meeting abstracts of the Physical Society of Japan, 68(2) (2), 600 - 600, Japanese


• Photoliminescence polarization in stacking-direction-controlled InAs/GaAs quantum dots

  Harada Y., Bessho Y., Kita T., Taguchi E., Yasuda H.

  The Physical Society of Japan (JPS), 26 Aug. 2013, Meeting abstracts of the Physical Society of Japan, 68(2) (2), 665 - 665, Japanese


• 26aXQ-4 Intensity modulation of optical pulse due to exciton quantum beat in a GaAs/AlAs multiple quantum well

  Kojima O., Hayashii K., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 26 Mar. 2013, Meeting abstracts of the Physical Society of Japan, 68(1) (1), 742 - 742, Japanese


• Physical Properties of Amorphous In-Ga-Zn-O Films Deposited at Different Sputtering Pressures (Special Issue : Active-Matrix Flatpanel Displays and Devices : TFT Technologies and FPD Materials)

  Yasuno Satoshi, Kita Takashi, Hino Aya

  Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physics, Mar. 2013, Japanese journal of applied physics : JJAP, 52(3) (3), 03BA01 - 1-5, English


• 18aFB-6 Intersubband transition dynamics in InAs/GaAs quantum dots in optical cavity

  Harada Y., Maeda T., Kita T.

  The Physical Society of Japan (JPS), 24 Aug. 2012, Meeting abstracts of the Physical Society of Japan, 67(2) (2), 614 - 614, Japanese


• 24pPSA-24 Carrier dynamics in strain compensation multiple stacked quantum dots under non-resenant excitatien rendition

  Tasaki J., Kojima O., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 05 Mar. 2012, Meeting abstracts of the Physical Society of Japan, 67(1) (1), 778 - 778, Japanese


• 21pPSA-37 Magneto-photoluminescence of biexciton bound to nitrogen pair in GaAs

  Harada Y., Kubo T., Inoue T., Kojima O., Kita T.

  The Physical Society of Japan (JPS), 24 Aug. 2011, Meeting abstracts of the Physical Society of Japan, 66(2) (2), 728 - 728, Japanese


• 21pPSA-48 Doping concentration dependence of coherent plasmon oscillation in GaAs nipi superlattice

  Kojima O., Sakamoto T., Ioue T., Kita T.

  The Physical Society of Japan (JPS), 24 Aug. 2011, Meeting abstracts of the Physical Society of Japan, 66(2) (2), 731 - 731, Japanese


• 21pPSB-46 Relaxation process of carriers in strain compensation multiple stacked quantum dots under non-resonant excitation condition

  Tasaki J., Kojima O., Kita T., Akabane K.

  The Physical Society of Japan (JPS), 24 Aug. 2011, Meeting abstracts of the Physical Society of Japan, 66(2) (2), 746 - 746, Japanese


• 21aRB-9 Incident pulse energy dependence on optical control of excitonic states in GaAs thin films

  Goi K., Kojima O., Kita T., Isu T.

  The Physical Society of Japan (JPS), 24 Aug. 2011, Meeting abstracts of the Physical Society of Japan, 66(2) (2), 713 - 713, Japanese


• 21pTL-7 Ferromagnetic State of GdN Thin Film Studied by Ferromagnetic Resonance II

  Fukuoka Y., Fujisawa M., Zhang W., Okubo S., Ohta H., Yoshitomi H., Kitayama S., Kita T., Wada O.

  The Physical Society of Japan (JPS), 24 Aug. 2011, Meeting abstracts of the Physical Society of Japan, 66(2) (2), 670 - 670, Japanese


• 25pHD-3 Ferromagnetic State of GdN Thin Film Studied by Ferromagnetic Resonance II

  Fukuoka Y., Fujisawa M., Zhang W., Okubo S., Ohta H., Yoshitomi H., Kitayama S., Kita T., Wada O.

  The Physical Society of Japan (JPS), 03 Mar. 2011, Meeting abstracts of the Physical Society of Japan, 66(1) (1), 698 - 698, Japanese


• 25pHD-7 Correlation between carriers in spacer layers and excitons in quantum dots in multi stacked structure

  Kojima O., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 03 Mar. 2011, Meeting abstracts of the Physical Society of Japan, 66(1) (1), 699 - 699, Japanese


• 25pPSA-20 Effect of coherence of spatial electric field on control of excitonic states in GaAs thin films

  Goi K., Kojima O., Yamashita T., Kita T., Isu T.

  The Physical Society of Japan (JPS), 03 Mar. 2011, Meeting abstracts of the Physical Society of Japan, 66(1) (1), 750 - 750, Japanese


• 25pPSA-19 Effects of formation of minibands to nonlinear optical property of excitons in GaAs/AlAs superlattices

  Yamashita T., Kojima O., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 03 Mar. 2011, Meeting abstracts of the Physical Society of Japan, 66(1) (1), 750 - 750, Japanese


• 25aWQ-1 Carrier transport in high density multiple stacked quantum dots

  Kojima O., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 18 Aug. 2010, Meeting abstracts of the Physical Society of Japan, 65(2) (2), 657 - 657, Japanese


• 25aWQ-4 Contribution of biexcitons to nonlinear optical property of excitons in GaAs/AlAs superlattices

  Yamashita T., Kojima O., Kita T., Akahane K.

  The Physical Society of Japan (JPS), 18 Aug. 2010, Meeting abstracts of the Physical Society of Japan, 65(2) (2), 658 - 658, Japanese


• 26aWQ-2 Ferromagnetic State of GdN Thin Film Studied by Ferromagnetic Resonance

  Fukuoka Y., Fujisawa M., Zhang W., Ohta H., Yoshitomi H., Kitayama S., Kita T., Wada O.

  The Physical Society of Japan (JPS), 18 Aug. 2010, Meeting abstracts of the Physical Society of Japan, 65(2) (2), 667 - 667, Japanese


• 24pRC-8 Long-lived oscillation due to coherent plasmons in a modulation doped GaAs

  Sakamoto T., Kojima O., Inoue T., Kita T.

  The Physical Society of Japan (JPS), 18 Aug. 2010, Meeting abstracts of the Physical Society of Japan, 65(2) (2), 699 - 699, Japanese


• 25pPSB-31 Property of control of excitonic states confined in GaAs thin films

  Goi K., Yamashita T., Kojima O., Kita T., Isu T.

  The Physical Society of Japan (JPS), 18 Aug. 2010, Meeting abstracts of the Physical Society of Japan, 65(2) (2), 731 - 731, Japanese


• 23aPS-40 Excitation power dependence of nonlinear optical response of excitons in GaAs/AlAs superlattices

  Yamashita T., Kojima O., Kita T., Wada O., Akahane K.

  The Physical Society of Japan (JPS), 01 Mar. 2010, Meeting abstracts of the Physical Society of Japan, 65(1) (1), 806 - 806, Japanese


• 21aHW-8 Dynamics of exciton relaxation in high density multiple stacked quantum dots

  Kojima O., Mamizuka M., Kita T., Wada O., Akahane K.

  The Physical Society of Japan (JPS), 01 Mar. 2010, Meeting abstracts of the Physical Society of Japan, 65(1) (1), 715 - 715, Japanese


• 22pPSB-8 Diamagnetic shift of the photoluminescence spectra in nitrogen δ-doped GaAs

  Harada Y., Kojima O., Kita T., Wada O.

  The Physical Society of Japan (JPS), 01 Mar. 2010, Meeting abstracts of the Physical Society of Japan, 65(1) (1), 782 - 782, Japanese


• 27aPS-28 First pulse power dependence of nonlinear optical response of excitons in GaAs thin film

  Yamashita T., Kojima O., Kita T., Wada O., Isu T.

  The Physical Society of Japan (JPS), 18 Aug. 2009, Meeting abstracts of the Physical Society of Japan, 64(2) (2), 651 - 651, Japanese


• 27aPS-54 Population of oxciton fine structure in isocloctronic bound cxcitons in nitrogen δ-dopcd GaAs

  Harada Y., Kojima O., Kita T., Wada O.

  The Physical Society of Japan (JPS), 18 Aug. 2009, Meeting abstracts of the Physical Society of Japan, 64(2) (2), 657 - 657, Japanese


• 26aXD-13 Control of excitonic optical nonlinear response in GaAs/AlAs multiple quantum wells

  Kojima O., Yamashita T., Kita T., Wada O., Akahane K.

  The Physical Society of Japan (JPS), 18 Aug. 2009, Meeting abstracts of the Physical Society of Japan, 64(2) (2), 593 - 593, Japanese


• 22aPS-43 Ultrafast exciton population control in GaAs thin films

  Kojima O., Kita T., Wada O., Isu T.

  The Physical Society of Japan (JPS), 25 Aug. 2008, Meeting abstracts of the Physical Society of Japan, 63(2) (2), 660 - 660, Japanese


• 21aYK-11 Effect of Mn Composition Distribution on Anisotropic Magneto-optical Properties in CdTe/CdMnTe Tilted Superlattices

  Harada Y., Kita T., Wada O., Ando H., Mariette Henri

  The Physical Society of Japan (JPS), 25 Aug. 2008, Meeting abstracts of the Physical Society of Japan, 63(2) (2), 605 - 605, Japanese


• 21pYH-2 Film thickness dependence of exciton-polariton propagation effects in GaAs thin films

  Watanabe S., Kojima O., Kita T., Wada O., Isu T.

  The Physical Society of Japan (JPS), 25 Aug. 2008, Meeting abstracts of the Physical Society of Japan, 63(2) (2), 648 - 648, Japanese


• 26aPS-27 Transient reflectivity change spectra of confined excitons in GaAs thin films

  Watanabe S., Kojima O., Kita T., Wada O., Isu T.

  The Physical Society of Japan (JPS), 29 Feb. 2008, Meeting abstracts of the Physical Society of Japan, 63(1) (1), 738 - 738, Japanese


• 25pWJ-6 Magnetic-Field Evolution of Luminescence Linewidth in CdTe/CdMuTe Tilted Superlattices

  Harada Y., Kita T., Wada O., Ando H., Mariette H.

  The Physical Society of Japan (JPS), 29 Feb. 2008, Meeting abstracts of the Physical Society of Japan, 63(1) (1), 683 - 683, Japanese


• 22aTG-7 Auisotropic Zeeman Shift in CdTe/CdMnTe Tilted Superlattices

  Harada Y., Kita T., Wada O., Ando H., Mariette H.

  The Physical Society of Japan (JPS), 21 Aug. 2007, Meeting abstracts of the Physical Society of Japan, 62(2) (2), 688 - 688, Japanese


• 18pTA-11 Near-Field Spectroscopy of II-VI Compound Tilted Superlattices

  Harada Y., Kita T., Wada O., Mariette H., Matsuda K., Kanemitsu Y.

  The Physical Society of Japan (JPS), 28 Feb. 2007, Meeting abstracts of the Physical Society of Japan, 62(1) (1), 663 - 663, Japanese


• 19pTA-6 In-Plane Anisotropy of Magneto-Optical Properties in CdTe/CdMnTe Tilted Superlattices

  Harada Y., Kita T., Wada O., Mariette H., Ando H.

  The Physical Society of Japan (JPS), 28 Feb. 2007, Meeting abstracts of the Physical Society of Japan, 62(1) (1), 673 - 673, Japanese


• 23pXJ-4 Scanning Near-Field Optical Microscopy of CdTe/CdMnTe Quantum Wire

  Harada Y., Kita T., Wada O., Marsal L., Mariette H., Matsuda K., Kanemitsu Y.

  The Physical Society of Japan (JPS), 18 Aug. 2006, Meeting abstracts of the Physical Society of Japan, 61(2) (2), 528 - 528, Japanese


• 25aXJ-12 Magnetic Field Dependence of Electronic Structure in CdTe/CdMnTe Quantum Wire

  Harada Y., Kita T., Wada O., Ando H.

  The Physical Society of Japan (JPS), 18 Aug. 2006, Meeting abstracts of the Physical Society of Japan, 61(2) (2), 544 - 544, Japanese


• 28pPSB-1 Control of Exchange Interaction and Electronic Structure in CdTe/CdMnTe Quantum Wire

  Harada Y., Kita T., Wada O., Ando H., Marsal L., Mariette H.

  The Physical Society of Japan (JPS), 04 Mar. 2006, Meeting abstracts of the Physical Society of Japan, 61(1) (1), 691 - 691, Japanese


• Polarized Optical Gain of Columnar InAs/GaAs Quantum Dots : To realize Semiconductor Optical Amplifier

  TAMURA Nobuhiro, ZHANG YUANCHANG, KITA Takashi, WADA Osamu, EBE Hiroji, NAKATA Yoshiaki, ARAKAWA Yasuhiko, SUGAWARA Mitsuru

  31 Jan. 2006, 電気学会研究会資料. : The Papers of Technical Meeting on Electromagnetic Theory, IEE Japan. EMT, 電磁界理論研究会, 2006(1) (1), 157 - 160, Japanese


• Polarized Optical Gain of Columnar InAs/GaAs Quantum Dots : To realize Semiconductor Optical Amplifier

  TAMURA Nobuhiro, Zhang YUANCHANG, KITA Takashi, WADA Osamu, EBE Hiroji, NAKATA Yoshiaki, ARAKAWA Yasuhiko, SUGAWARA Mitsuru

  We have investigated polarized optical gain of columnar quantum dots by using variable stripe length method. The columnar QDs were grown by closely stacking the Stranski-Krastanow-mode InAs-island layers. The aspect ratio of the QD can be controlled by changing in the stacking layer number (SLN). The optical gain sensitively depends on the SLN. With increasing the SLN, the TM-sensitive optical gain has been demonstrated. Furthermore, we obtained almost polarization insensitive optical gain for the sample with seven staking layers.

  The Institute of Electronics, Information and Communication Engineers, 26 Jan. 2006, Technical report of IEICE. LQE, 105(593) (593), 35 - 38, Japanese


• 24aZC-4 Valence band mixing in CdTe/Cd_<0.75>Mn_<0.25>Te nano-wire structures in magnetic field

  Harada Y., Naganuma R., Kita T., Wada O., Marsal L., Mariette H., Ando H.

  The Physical Society of Japan (JPS), 04 Mar. 2005, Meeting abstracts of the Physical Society of Japan, 60(1) (1), 630 - 630, Japanese


• 14aYC-3 Anisotropic energy relaxation of exciton magnetic polaron in CdTe/(Cd, Mn)Te quantum wire

  Naganuma R., Harada Y., Kita T., Wada O., Marsal L., Marriete H.

  The Physical Society of Japan (JPS), 25 Aug. 2004, Meeting abstracts of the Physical Society of Japan, 59(2) (2), 614 - 614, Japanese


• 29pYF-12 Formation of exciton magnetic polaron in CdTe/CdMnTe nano wires

  Naganuma R., Harada Y., Matsuura Y., Nagahara S., Kita T., Wada O., Meriette H.

  The Physical Society of Japan (JPS), 03 Mar. 2004, Meeting abstracts of the Physical Society of Japan, 59(1) (1), 700 - 700, Japanese


• 29pYF-11 Anisotropic magnetic-field dependence of hole spins in CdTe/(Cd,Mn)Te wire structures

  Harada Y., Naganuma R., Matsuura Y., Nagahara S., Kita T., Wada O., Mariette H.

  The Physical Society of Japan (JPS), 03 Mar. 2004, Meeting abstracts of the Physical Society of Japan, 59(1) (1), 700 - 700, Japanese


• Polarization Control of Quantum Dots for SOA Applications

  TANAKA Hirokazu, PACHAMUTHU Jayavel, UCHIGAMI Masahiro, KITA Takashi, WADA Osamu, EBE Hiroji, SUGAWARA Mitsuru, ARAKAWA Yasuhiko, NAKATA Yoshiaki, AKIYAMA Tomoyuki

  We have investigated polarization of photoluminescence (PL) emission from the cleaved-edge surface of a wafer involving InAs self-assembled quantum dots (QDs) capped by In_xGa_<1-x>As layer. With increasing indium (In) composition x in the capping layer, the PL of QDs shifts toward the longer wavelength side and shows an enhancement of the TM-mode PL intensity at x =0.13. In order to investigate effects of light propagation on the PL polarization, we have compared electroluminescence (EL) with PL spectra and investigated the PL excitation-wavelength dependence of the PL polarization.

  The Institute of Electronics, Information and Communication Engineers, 11 Dec. 2003, Technical report of IEICE. LQE, 103(526) (526), 5 - 8, Japanese


• Anisotropic exchange interaction and quantum wire properties in CdTe/CdMnTe fractional superlattice grown on a vicinal substrate

  Nagahara S., Mastuura Y., Naganuma R., Kita T., Wada O., Mariette H.

  The Physical Society of Japan (JPS), 15 Aug. 2003, Meeting abstracts of the Physical Society of Japan, 58(2) (2), 577 - 577, Japanese


• Magneto-optical properties in CdTe/CdMnTe quantum wires

  Nagahara S., Mastuura Y., Kita T., Wada O., Mariette H.

  The Physical Society of Japan (JPS), 13 Aug. 2002, Meeting abstracts of the Physical Society of Japan, 57(2) (2), 586 - 586, Japanese


• Excitonic luminescence from CdTe/CdMgTe quantum wires

  Nagahara S, Kita T., Wada O., Mariette H.

  The Physical Society of Japan (JPS), 13 Aug. 2002, Meeting abstracts of the Physical Society of Japan, 57(2) (2), 559 - 559, Japanese


• Excitonic States in CdMgTe/CdTe Quantum Wires

  NAGAHARA Seiji, KITA Takashi, WADA Osamu, MARSAL Laurent, MARIETTE Henri

  We investigated excitonic luminescence from CdTe/Cd_<0.74>Mg_<0.26>Te quantum wires (QWRs) grown on vicinal substrates. The temperature dependence of the radiative lifetime of one-dimensional (1D) exciton in the QWRs was measured by using time-resolved spectroscopy, and is compared with that of two-dimensional (2D) exciton in CdTe/Cd_<0.74>Mg_<0.26>Te quantum well (QW). The radiative lifetime in the QWRs and the QW increase with T and show a clearly different behavior. The observed radiative lifetime in the QWRs and QW are expressed as 100 T^<1/2> psK^<-1/2> and 11 T psK^<-1> respectively. At low temperature < 10K, however, the radiative lifetimes deviate from the T^<1/2> dependence. In this temperature region, a new PL peak appears at the lower energy side of the exciton PL. This low energy PL peak is enhanced under a high excitation. By analyzing the PL spectra and the PL decay profiles, we discuss the origin of the new PL signal.

  The Institute of Electronics, Information and Communication Engineers, 04 Oct. 2001, IEICE technical report. Electron devices, 101(337) (337), 13 - 18, Japanese


• Initial stages of InAs-quantum dot formation studies by reflectance-difference spectroscopy and photoluminescence

  K Yamashita, T Kita, T Nishino

  2000, COMPOUND SEMICONDUCTORS 1999, (166) (166), 239 - 242, English


• Self-organized process of InAs-quantum dots monitored by reflectance-difference spectroscopy

  T Kita, T Hagihara, K Yamashita, T Nishino

  1999, COMPOUND SEMICONDUCTORS 1998, (162) (162), 457 - 462, English


• The optical process in AlInP/GaInP/AlInP quantum wells (vol 80, pg 4592, 1996)

  Y Ishitani, S Minagawa, T Kita, T Nishino, H Yaguchi, Y Shiraki

  Dec. 1997, JOURNAL OF APPLIED PHYSICS, 82(11) (11), 5876 - 5876, English

  Others


• Photoluminescence from metastable states in long-range ordered (Al0.5G0.5)0.51In0.49P

  K. Yamashita, T. Kita, H. Nakayama, T. Nishino

  1997, Physical Review B, 55(7) (7), 4411 - 4416


• Higher-interband electroreflectance of long-range ordered Ga0.5In0.5P

  T Kita, K Yamashita, T Nishino

  Dec. 1996, PHYSICAL REVIEW B, 54(23) (23), 16714 - 16718, English


• Photocurrent anisotropy in compositional modulated superlattice of long-range ordered Ga0.5In0.5P

  T Kita, A Fujiwara, H Nakayama, T Nishino

  Apr. 1996, JOURNAL OF ELECTRONIC MATERIALS, 25(4) (4), 661 - 665, English


• Transient cathodoluminescence spectroscopy of synthetic diamond films

  T Kita, Y Dakeya, GP Wei, T Nishino, M Marinelli, A Hatta, T Ito, A Hiraki

  1996, DIAMOND FILMS AND TECHNOLOGY, 6(3) (3), 139 - 145, English


• Direct optical transition in indirect-gap (Al0.5Ga0.5)0.51In0.49P by atomic ordering

  K. Yamashita, T. Kita, H. Nakayama, T. Nishino

  1996, Physical Review B, 53(23) (23), 15713 - 15718


• ELECTRIC-FIELD-INDUCED COUPLING OF WAVE-FUNCTIONS IN A INGAAS SINGLE-QUANTUM-WELL

  T KITA, H NAKAYAMA, T NISHINO

  1994, SUPERLATTICES AND MICROSTRUCTURES, 15(2) (2), 137 - 140, English


• Electric field effect for optical transitions in In GaAs/GaAs strained layer superlattices

  Kita Takashi, Nakayama Hiroshi, Nishino Taneo

  We have performed electroreflectance spectroscopy on a 5-period In_0.26>Ga_0.76>As(3nm), GaAs(10nm) strained layer superlattice as a function of electric field.The applied electric field was exactly determined by the Franz-Keldysh oscillation of GaAs.We have resolved transitions between electrons confined in the In_0. 26>Ga_0.76>As layer and light holes localized in the adjacent layers.The type-II Stark-ladder transitions are clearly observed. The observed field evolution of the transition energy shows a nonlinear behavior originating from an anticrossing by oupling resonantly between the first light-hole subband and vertual energy states of light holes.

  The Institute of Electronics, Information and Communication Engineers, 19 Nov. 1993, IEICE technical report. Electron devices, 93(326) (326), 49 - 52, Japanese


• ELECTRONIC STRUCTURE OF LONG-RANGE ORDERED Ga_<0.5>In_<0.5>P ALLOY SEMICONDUCTOR

  Kanata Takashi, Nakayama Hiroshi, Nishino Taneo

  Kobe University, Mar. 1992, Memoirs of the Graduate School of Science and Technology, Kobe University. A, 10, 1 - 9, English

• Energy conversion efficiency of solar cells

  Takashi. Kita, Harada. Yukihiro, Asahi. Shigeo

  Springer, Aug. 2019, English, ISBN: 9789811390890


• 太陽電池のエネルギー変換効率

  喜多, 隆

  コロナ社, Oct. 2012, Japanese, ISBN: 9784339008425


• Quantum Dot Switches：Towards Nanoscale Power-Efficient All-Optical Signal Processing

  C Y Jin, M Hopkinson, O Kojima, T Kita, K Akahane, O Wada

  Others, Quantum Dot Devices:Lecture Notes in Nanoscale Science and Technology, 2012, English

  Scholarly book


• カーボンナノチューブ・グラフェンハンドブック

  喜多 隆

  Joint work, コロナ社, Sep. 2011, Japanese, ISBN: 9784339066210

  Scholarly book


• 自己組織化ハンドブック

  喜多 隆

  Single work, 株式会社エヌ・ティー・エス刊、第2編材料編・第2章ハードマテリアル・第3節「AlGaInP系半導体の自己組織化」執筆, Nov. 2009, Japanese

  Scholarly book


• Atomic Ordering in Epitaxial Alloy Semiconductors:from the Discoveries to the Physical Understanding

  H Nakayama, T Kita, T Nishino

  Joint work, 材料編、第6章、6.3.1項「AlGaInP系赤色半導体の自己組織化」執筆, 1997, English

  Scholarly book


• 半導体計測評価事典

  喜多 隆, 西野 種夫

  Joint work, サイエンスフォーラム, 1994, English

  Scholarly book


• Oriented Growth of Semiconductor Thin Films on Noncrystalline Substrates for Graphoepitaxy

  T Kanat, T Kita

  Single work, 大阪大学学位論文, Feb. 1991, English

  Scholarly book


• Properties of Lithium Niobate

  T Kanata, T Kita, K Kubota

  Joint work, INSPEC, London, 1989, English

  Scholarly book

• Photocurrent Enhancement in CsPbBr3-xClx-based Soler Cells with Embedded Pbs Quantum Dots

  H. Mahamu, S. Ueno, S. Asahi, T. Kita

  53rd IEEE Photovoltaic Specialists Conference (PVSC 53), Jun. 2025, English, Montreal, Canada

  [Invited]


• Excitation Power Dependence and Loss of Photonic Energy Conversion

  R. Hanakuma, I. Kan, S. Asahi, Y. Harada, T. Kita

  53rd IEEE Photovoltaic Specialists Conference (PVSC 53), Jun. 2025, English, Montreal, Canada

  [Invited]


• Efficient Intraband Photoexcitation in Two-step Photon Up-Conversion Solar Cells Using Double-Tunnel Junction

  S. Asahi, K. Matsuzawa, T. Kita

  R. Hanakuma;I. Kan;S. Asahi;Y. Harada;T. Kita, Jun. 2025, English, Montreal, Canada

  [Invited]


• Photon Partitioning by Band Filling in Intermediate-Band Thermoradiative Diodes”

  Y. Harada, T. Kita

  53rd IEEE Photovoltaic Specialists Conference (PVSC 53), English, Montreal, Canada

  [Invited]


• 半導体光共振器中での電気光学効果を利用したテラヘルツ電界センサ：結晶面方位の検討

  北田貴弘, 原田幸弘, 海津利行, 南康夫, 小島磨, 喜多隆, 和田修

  第72回応用物理学会春季学術講演会, Japanese


• InGaAs/GaAs多重量子井戸における励起子エネルギーに対する歪みの効果

  小島磨, 中島泰義, 井上知也, 喜多隆

  第72回応用物理学会春季学術講演会, Japanese


• 半導体光共振器中での電気光学効果を利用したテラヘルツ電界センサ：位相差信号の共振器Q値依存性

  原田幸弘, 北田貴弘, 海津利行, 南康夫, 小島磨, 喜多隆, 和田修

  第72回応用物理学会春季学術講演会


• ダブルトンネル接合を利用したアップコンバージョン太陽電池の効率的バンド内遷移

  朝日重雄, 松沢光一郎, 喜多隆

  第72回応用物理学会春季学術講演会, Japanese


• Siレーザーパワーコンバーターの分光評価

  花熊亮汰, 朝日重雄, 原田幸弘, 喜多隆

  第72回応用物理学会春季学術講演会, Japanese


• Maximum Output Power Density by Photon Partitioning Optimization in Intermediate-Band Thermoradiative diodes

  Y. Harada, T. Kita

  35th International Photovoltaic Science and Engineering Conference(PVSEC-35), English, Shizuoka, Japan


• Voltage-Boost Effects Enhanced by Quantum Dots in Two-Step Photon Up-Conversion Solar Cells

  D. Nagai, S. Asahi, T. Kita

  The 43rd Electronic Materials Symposium, English, Nara


• 多重積層InAs/GaAs量子ドットを用いた光伝導アンテナの様々な励起光波長における光電流の励起光強度依存性

  海津利行, 小島磨, 南康夫, 北田貴弘, 原田幸弘, 喜多隆, 和田修

  第85回応用物理学会秋季学術講演会, Japanese, 新潟県, Japan, Domestic conference


• InAs量子ドット成長に起因する格子不整合歪みを利用した差周波混合によるテラヘルツ電磁波発生

  鈴木崇斗, 小島磨, 海津利行, 和田修, 喜多隆

  第85回応用物理学会秋季学術講演会, Japanese, 新潟県, Domestic conference


• 中間バンドを有する熱放射ダイオードの理論発電密度(Ⅱ)

  原田幸弘, 喜多隆

  第85回応用物理学会秋季学術講演会, Japanese, 新潟県, Japan, Domestic conference


• Intraband Transitions Induced by Below-Bandgap Photoexcitation at CsPbBr₃/GaAs Heterointerface

  H. Mahamu, S. Asahi, T. Kita

  第85回応用物理学会秋季学術講演会, Japanese, 新潟県, Japan, Domestic conference


• MAPbI₃/Siヘテロ構造を利用した二段階フォトンアップコンバージョン太陽電池

  徳永隼也, 朝日重雄, 喜多隆

  第85回応用物理学会秋季学術講演会, Japanese, 新潟県, Japan, Domestic conference


• 2段階フォトンアップコンバージョン太陽電池におけるバンド内赤外光学遷移の量子ドットによる増強特性

  山本祥, 永井大地, 朝日重雄, 喜多隆

  第85回応用物理学会秋季学術講演会, Japanese, 新潟県, Japan, Domestic conference


• Two-Step Photon Upconversion Solar Cells Based on CsPbBr3/GaAs Heterointerface

  H. Mahamu, K. Yoshida, S. Asahi, T. Kita

  52th IEEE Photovoltaic Specialists Conference (PVSC52）, English


• Voltage Boost Effects in Solar Cells Utilizing Adiabatic Photon Up-Conversion with a Double Tunnel Junction

  K. Matsuzawa, S. Asahi, T. Kita

  52th IEEE Photovoltaic Specialists Conference (PVSC52）, English


• 極性制御した2段階アップコンバージョン太陽電池におけるアップコンバージョン特性の変化

  西琢朗, 豊友太, 朝日重雄, 喜多隆

  第71回応用物理学会春季学術講演会, Japanese, 東京都市大学


• Photon Up-Conversion in MAPbBr₃ Perovskite Deposited on GaAs

  H. Mahamu, M. Bourzier, S. Asahi, T. Kita

  第71回応用物理学会春季学術講演会, English, 東京都市大学


• 中間バンドを有する熱放射ダイオードの理論発電密度

  原田幸弘、西井風花、喜多隆

  第71回応用物理学会春季学術講演会, 東京都市大学


• Quantum-Dot-Free Two-Step Photon Up-Conversion Solar Cells Based on Cesium Lead(Ⅱ)Bromide/Gallinm Arsenide Inferface

  H. Mahamu, S. Asahi, T. Kita

  第34回光物性研究会, English


• 局在表面プラズモン共鳴による高ドープInAs/GaAs量子ドットにおける赤外光吸収増強”

  川上瑞人, 原田幸弘, 朝日重雄, 喜多隆

  第34回光物性研究会, Japanese


• ダブルトンネル接合を内包する半導体ヘテロ構造における断熱的フォトンアップコンバージョンによる太陽電池の出力電圧上昇効果

  松沢光一郎, 朝日重雄, 喜多隆

  日本材料学会 2023年度 第3回半導体エレクトロニクス部門委員会第2回研究会, Japanese, 立命館大学 朱雀キャンパス


• Voltage Boost Effects in Two-Step Photon Up-Conversion Solar Cells with Double Tunnel Junctions

  K. Matsuzawa, S. Asahi, T. Kita

  第42回電子材料シンポジウム（EMS42), English, THE KASHIHARA


• Enhanced Near-Infrared Absorption by Localized Surface Plasmon Resonence in Heavily-Doped InAs/GaAs Quantum Dots

  Y. Harada, M. Kawakami, S. Asahi, T. Kita

  第42回電子材料シンポジウム（EMS42), English, THE KASHIHARA


• nfluence of Substrates on Perovskite Deposited by Solution Process, a Step to Photon Up-Conversion Solar Cells

  H. Mahamu, K. Yoshida, S. Asahi, T. Kita

  第84回応用物理学会秋季学術講演会, 熊本城ホール ほか3会場, Japan, Domestic conference


• 高ドープInAs/GaAs量子ドットにおける局在表面プラズモン共鳴による赤外光吸収増強

  川上瑞人, 原田幸弘, 朝日重雄, 喜多隆

  第84回応用物理学会秋季学術講演会, Japanese, 熊本城ホール ほか3会場, Japan, Domestic conference


• ダブルトンネル接合を利用したラチェット型アップコンバージョン太陽電池における電圧上昇効果

  松沢光一郎, 朝日重雄, 喜多隆

  第84回応用物理学会秋季学術講演会, Japanese, 熊本城ホール ほか3会場, Japan, Domestic conference


• Up-Converted Carrier Dynamics in AlxGa₁-xAs/InAs-Based Photon Up-Conversion Solar Cells with a Doubled-Heterointerface

  H. Mahamu, S. Asahi, T. Kita

  50th IEEE Photovoltaic Specialists Conference (PVSC50), Jun. 2023, English, Puerto Rico, International conference


• Localized Surface Plasmon Pesonance of Quantum Dots in Two-Step Photon Up-Conversion Solar Cell Structures

  Y. Harada, M. Kawakami, S. Asahi, T. Kita

  50th IEEE Photovoltaic Specialists Conference (PVSC50), Jun. 2023, Puerto Rico, International conference


• Optimization of the Morphological Structure of Spin-Coated MAPbBr₃ on p-GaAs Substrates for Perovskite/GaAs-based Photon Up-conversion Solar Cells

  H. Mahamu, M. Bourzier, S. Asahi, T. Kita

  第70回応用物理学会春季学術講演会, English, ﾊｲﾌﾞﾘｯﾄﾞ開催(上智大学&ｵﾝﾗｲﾝ), Japan


• ドープされたInAs/GaAs量子ドットにおける局在表面プラズモン共鳴による電場増強効果

  川上瑞人, 原田幸弘, 朝日重雄, 喜多隆

  日本材料学会 2022年度エレクトロニクス部門委員会, Japanese, 日本材料学会半導体エレクトロニクス部門委員会, オンライン開催, Japan


• 量子ドットを内包する半導体ヘテロナノ構造を利用した量子型赤外光検出素子の暗電流制御

  錦見海地, 朝日重雄, 喜多隆

  2022年度 第3回半導体エレクトロニクス部門委員会 第2回研究会、2022年度第1回ナノ材料部門委員会第1回研究会, Nov. 2022, Japanese, 京都大学, Japan


• Broadband Enhancement of Intraband Transition in Two-Step Photon Up-Conversion Solar Cells with a Doubled-Heterointerface Strucure

  H. Mahamu, S. Asahi, T. Kita

  33rd International Photovoltaic Science and Engineering Conference(PVSEC-33), English, Nagoya, International conference


• Thermal Activation Process at the Heterointerface in Photon Up-Conversion Solar Cells Using hole Up-Conversion

  Y. Toyo, S. Asahi, H. Mahamu, T. Kita

  第41回電子材料シンポジウム（EMS41), Oct. 2022, English


• Intraband Transition in Two-Step Photon Up-Conversion Solar Cells

  Y. Harada, S. Asahi, T. Kita

  第41回電子材料シンポジウム（EMS41), Oct. 2022, English


• High Absorptivity of Intraband Transition Occurring at Heterointerface in Two-Step Photon Up-Conversion Solar Cells

  S. Asahi, H. Mahamu, T. Kita

  8th World Conference on Photovoltaic Energy Conversion(WCPEC-8), English, International conference


• ダブルパルス-ポンプ-プローブ法によるGaAs/AlAs 多重量子井戸における超高速応答の評価

  小島磨, 田町郁夫, 喜多隆

  第83回応用物理学会秋季学術講演会, Japanese


• Electrical Properties of AlGaAs/GaAs-Based Two-Step Photon Up-Conversion Solar Cells with Doubled Heterointerfaces

  H. Mahamu, S. Asahi, T. Kita

  第83回応用物理学会秋季学術講演会, English, 東北大学&オンライン, Japan, Domestic conference


• “GaSb/AlGaSb多重量子井戸における障壁層励起による差周波混合過程に対する井戸幅依存性

  小島磨, 大崎真之介, 加島正一, 喜多隆, 赤羽浩一

  日本物理学会2022年秋季大会物性分野, Japanese


• Photoluminescence Characteristics of InAs Quantum Dots in the Doubled-heterointerface of AlGaAs/GaAs-based Two-step Photon Up-conversion Solar Cells

  H. Mahamu, S. Asahi, T. Kita

  9th International Symposium on Control of Semiconductor Interfaces(ISCSI-IX), English, International conference


• Differece on Infrared-Induced Response Between N-i-p and P-i-n Structures of Two-Step Photon Up-Conversion Solre Cells

  S. Asahi, M. NielsenK, N. Ekins-Daukes, T. Kita

  International Conference on the Physics of Semiconductors(ICPS 2022), Sydney, International conference


• Intraband Absorptivity in Two-Step Photon Up-Conversion Solar Cells

  Y. Harada, K. Kusaki, S. Asahi, T. Kita

  International Conference on the Physics of Semiconductors(ICPS 2022), English, Sydney, International conference

  Oral presentation


• 正孔フォトンアップコンバージョン太陽電池の赤外光照射による光電流制御

  豊友太, 朝日重雄, H. Mahamu, M, P. Nielsen, N, J. Ekins-Daukes, 喜多隆

  第69回応用物理学会春季学術講演会, Mar. 2022, Japanese


• 2段階フォトンアップコンバージョン太陽電池における ヘテロ界面のバンド内遷移の光吸収率

  朝日 重雄, Mahamu Hambalee, 喜多 隆

  第69回応用物理学会春季学術講演会, Mar. 2022, Japanese


• Control of Quantum-Dot Growth for Novel Solar Cells

  T. Kita

  (14th International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials / 15th International Conference on Plasma-Nano Technology & Science (ISPlasma2022 / IC-PLANTS2022),, English, Nagoya, Japan, International conference

  [Invited]

  Invited oral presentation


• 太陽電池のエネルギー変換効率と高効率化への道

  喜多 隆

  令和3年度 応用物理学会 多元系化合物・太陽電池研究会 年末講演会, Dec. 2021, Japanese

  [Invited]


• GaSb/AlGaSb多重量子井戸における障壁層励起での差周波混合法によるテラヘルツ電磁波発生

  小島磨, 喜多隆, 赤羽浩一

  第82回応用物理学会秋季学術講演会, Japanese


• 正孔のアップコンバージョンを利用した2段階フォトンアップコンバージョン太陽電池のバンド内遷移過程

  朝日重雄, M, P .Nielsen, 池田一真, N. J. Ekins-Daukes, 喜多隆

  第82回応用物理学会秋季学術講演会, Japanese


• On the Simulation of Two-Step Photocurrent Generation in an InAs Quantum Dot -in-Well Intermediate Band Solar Cell

  Y. Zhu, S. Asahi, T. Kita

  第82回応用物理学会秋季学術講演会, English


• エピタキシャル成長を利用した固体レーザー冷却用高品質Yb:Y-Al-O厚膜の作製

  中山雄太, 薩井篤, 松尾祐治, 原田幸弘, 喜多隆

  第82回応用物理学会秋季学術講演会, Japanese


• Control of Carrier Dynamics in Quantum Dots for Intermediate-Band Solar Cells

  T. Kita

  2021 International Conference on Solid State Devices, Sep. 2021, English

  [Invited]

  Invited oral presentation


• Two-step up-conversion solar cells: recent progress and future direction

  S. Asahi, T. Kita

  8th International Workshop Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures (SemiconNano2021), English, International conference

  [Invited]

  Invited oral presentation


• Collection of Photocarriers Varied by Effective Electron Intraband Excitation in an InAs Quantum Dot-in-Well Intermediate Band Solar Cell

  Y. Zhu, S. Asahi, T. Kita

  48th IEEE Photovoltaic Specialists Conference, English, Miami, International conference


• Lateral Photoconductivity of Multiple-Stacked InAs/GaAs Quantum Dot Structure for Photoconductive Antenna Device

  T. Kaizu, I. Kohama, Y. Minami, T. Kitada, Y. Harada, O. Kojima, T. Kita, O. Wada

  Compund Semiconductor Week(CSW)2021, English, Stockholm, International conference


• GaAs/AlAs多重量子井戸における差周波混合によるテラヘルツ電磁波発生の周波数依存性に対する励起子効果

  小島磨, 坂上寛太, 喜多隆, R. Hogg

  第68回応用物理学会春季学術講演会, Mar. 2021, Japanese, オンライン開催, Domestic conference

  Oral presentation


• 光伝導アンテナ応用へ向けた多重積層InAs/GaAs量子ドットの光学特性評価

  海津利行, 小濱一晟, 南康夫, 北田貴弘, 原田幸弘, 小島磨, 喜多隆, 和田修

  第68回応用物理学会春季学術講演会, Mar. 2021, Japanese, オンライン開催, Domestic conference

  Oral presentation


• 相分離したYb添加Y-Al-O透明薄膜における結晶相間エネルギー移動

  中山雄太, 原田幸弘, 石原嗣生, 喜多隆

  第68回応用物理学会春季学術講演会, Mar. 2021, Japanese, オンライン開催, Domestic conference

  Oral presentation


• Efficiency Compensation from Intraband Transitions of Opposite Carrier in a Quantum Dot-In-Well Intermediate Band Solar Cell

  Y. Zhu, S. Asahi, T. Kita

  第68回応用物理学会春季学術講演会, Mar. 2021, English

  Oral presentation


• 変調ドープした二段階フォトンアップコンバージョン太陽電池における電圧上昇効果

  渡辺航平, 朝日重雄, 喜多隆

  第68回応用物理学会春季学術講演会, Mar. 2021, Japanese, オンライン開催, Domestic conference

  Oral presentation


• Laser Cooling Efficiency of Yb-doped Yttrium Aluminum Oxide Crystals

  T. Kita, Y. Nakayama

  SPIE Photonics West, English

  [Invited]

  Invited oral presentation


• Yb-doped Yttrium Aluminum Perovskite for Radiation Balanced Laser Application

  Y. Nakayama, Y. Harada, T. Kita

  SPIE Photonics West, English

  [Invited]

  Invited oral presentation


• ウイルスと戦えるこれからの紫外光源

  喜多隆

  応用物理学会関西支部 2020年度第1回＋第2回合同講演会, Japanese, オンライン講演

  [Invited]

  Invited oral presentation


• GaAs/AlAs多重量子井戸間の励起子共鳴を利用した差周波混合によるテラヘルツ電磁波の増強

  坂上寛太, 小島磨, 喜多隆, MatthewSteer, RichardHogg

  第31回光物性研究会(2020), Dec. 2020, Japanese, オンライン開催(Zoom), Domestic conference

  Oral presentation


• Development of Mid-Infrared Photodetector Can Operate Under Room Temperature with High Sensitivity Using Intraband Transition

  K. Nakabayashi, S. Asahi, T. Kita

  第39回電子材料シンポジウム（EMS39), Oct. 2020, English, オンライン開催


• Anti-Stokes Photoluminescence Caused by Energy Transfer in Ytterbium-Doped Yttrium Aluminum perovskite

  Y. nakayama, Y. Harada, T. Kita

  第39回電子材料シンポジウム（EMS39), Oct. 2020, English, オンライン開催, Domestic conference


• Performance Analysis of an InAs/GaAs/Al0.3Ga0.7As Quantum Dot-in-Well Intermediate Band Solar Cell Under Two-Step Photoexcitations

  Y. Zhu, S. Asahi, K. Watanabe, T. Kita

  第39回電子材料シンポジウム（EMS39), Oct. 2020, English, オンライン開催, Domestic conference


• Dramatic Enhancement of Current and Voltage in Modulation-Doped Two-Step Photon Up-Conversion Solar Cells

  K. Watanabe, S. Asahi, Y. Zhu, T. Kita

  第39回電子材料シンポジウム（EMS39), Oct. 2020, English, オンライン開催, Domestic conference


• 正孔のアップコンバージョンを利用した2段階フォトンアップコンバージョン太陽電池の追加赤外光による光電流減少メカニズム

  朝日重雄, M. Nielsen, N.J. Ekins-Daukes, 喜多隆

  第81回応用物理学会春季学術講演会, Sep. 2020, Japanese, オンライン開催, Domestic conference

  Oral presentation


• Performance Degradation of Quantum Dot-in-Well Intermediate Band Solar Cell Under Intense Bi-Color Barrier and Intraband Photoexcitations

  Y.Zhu, S.Asahi, T. Kita

  第81回応用物理学会春季学術講演会, Sep. 2020, Japanese, オンライン開催, Domestic conference

  Oral presentation


• 反射率変化で観測するGaAs/AlAs多重量子における重い正孔-軽い正孔励起子間相互作用に対する励起子の安定性の効果

  小島磨, 喜多隆, R. Hogg

  第81回応用物理学会春季学術講演会, Sep. 2020, Japanese, オンライン開催, Domestic conference

  Oral presentation


• 変調ドープした二段階フォトンアップコンバージョン太陽電池における光励起効率の向上

  渡辺航平, 朝日重雄, 喜多隆

  第81回応用物理学会秋季学術講演会, Japanese, オンライン開催, Domestic conference

  Oral presentation


• 変調ドープによるフォトンアップコンバージョン太陽電池の特性制御

  渡辺航平, 朝日重雄, Yaxing Zhu, 喜多隆

  日本材料学会半導体エレクトロニクス部門委員会, Aug. 2020, Japanese, オンライン開催, Domestic conference


• Up-Converted Photocurrent Enhancement in Modulation-Doped Two-Step Photon Up-Conversion Solar Cells

  K. Watanabe, S. Asahi, Y. Zhu, and T. Kita

  47th IEEE Photovoltaic Specialists Conference, English, Calgary

  Oral presentation


• Intensive-Light-Induced Backtracking Voltage Phenomenon: An Insight into Intermediate-Band Solar Cell Output Performance

  Y. Zhu, S. Asahi, and T. Kita

  47th IEEE Photovoltaic Specialists Conference, English, Calgary, International conference

  Oral presentation


• 変調ドープした二段階フォトンアップコンバージョン太陽電池におけるアップコンバージョン電流増大

  渡辺航平, 朝日重雄, 喜多隆

  第67回応用物理学会春季学術講演会, 新型コロナウイルス感染拡大防止のため中止。 講演予稿集発行されたので、本講演会での発表は成立するものとする (第67回応用物理学会春季学術講演会HPより抜粋)


• GaAs/AlAs多重量子井戸における差周波混合によるテラヘルツ電磁波発生に対する励起子の重ね合わせ効果

  坂上寛太, 小島磨, 喜多隆, Richard Hogg

  第67回応用物理学会春季学術講演会, 新型コロナウイルス感染拡大防止のため中止。 講演予稿集発行されたので、本講演会での発表は成立するものとする (第67回応用物理学会春季学術講演会HPより抜粋)


• Yb添加YAG-YAM共晶透明薄膜におけるAnti-Stokes PL過程と理想レーザー冷却効率

  中山雄太, 中川望夢, 原田幸弘, 喜多隆

  第67回応用物理学会春季学術講演会, 新型コロナウイルス感染拡大防止のため中止。 講演予稿集発行されたので、本講演会での発表は成立するものとする (第67回応用物理学会春季学術講演会HPより抜粋)


• Voltage Backtracking Behavior in Intermediate-Band Solar Cell under Intensive Bi/Uni-Color Photoexcitation Examination

  Y. Zhu, S. Asahi, T. Kita

  第67回応用物理学会春季学術講演会, 新型コロナウイルス感染拡大防止のため中止。 講演予稿集発行されたので、本講演会での発表は成立するものとする (第67回応用物理学会春季学術講演会HPより抜粋)


• InAs量子ドットとAl0.3Ga0.7As/GaAsヘテロ界面を利用した赤外線検出器の受光感度特性

  朝日重雄, 村田貴彦, StefanoSanguinetti, 喜多隆

  第67回応用物理学会春季学術講演会, 新型コロナウイルス感染拡大防止のため中止。 講演予稿集発行されたので、本講演会での発表は成立するものとする (第67回応用物理学会春季学術講演会HPより抜粋)


• 2段階フォトンアップコンバージョン太陽電池におけるバンド内遷移特性

  原田幸弘, 草木和輝, 朝日重雄, 喜多隆

  第67回応用物理学会春季学術講演会, 新型コロナウイルス感染拡大防止のため中止。 講演予稿集発行されたので、本講演会での発表は成立するものとする (第67回応用物理学会春季学術講演会HPより抜粋)


• GaAs/AlAs多重量子井戸における連続波励起子共鳴励起による変調効果

  小島磨, 喜多隆, Richard Hogg

  第67回応用物理学会春季学術講演会, 新型コロナウイルス感染拡大防止のため中止。 講演予稿集発行されたので、本講演会での発表は成立するものとする (第67回応用物理学会春季学術講演会HPより抜粋)


• 多重積層InAs/GaAs量子ドットを用いた光伝導アンテナの作製

  海津利行, 北田貴弘, 南康夫, 原田幸弘, 小島磨, 喜多隆, 和田修

  第67回応用物理学会春季学術講演会, 新型コロナウイルス感染拡大防止のため中止。 講演予稿集発行されたので、本講演会での発表は成立するものとする (第67回応用物理学会春季学術講演会HPより抜粋)


• Enhancement of laser cooling efficiency in rare-earth-doped oxide at elevated high temperature

  Y. Nakayama, Y. Harada, and T. Kita

  SPIE Photonics West, English, San Francisco, International conference

  [Invited]

  Invited oral presentation


• Control of Exciton Interference in GaAs/AlAs Multiple Quantum Wells

  O. Kojima, and T. Kita

  7th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, English, Kobe, Japan

  Oral presentation


• Excitation Energy Dependence of Hot-Carrier Extraction Process in InAs/GaAs Quantum Dot Superlattice Solar Cells

  Y. Harada, N. Iwata, S. Asahi, and T. Kita

  7th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, English, Kobe, Japan, International conference

  Oral presentation


• Polarization-Insensitive Optical Gain of Highly stacked InAs/GaAs Quantum Dot Semiconductor Optical Amplifier

  T. Kaizu, T. Kakutani, and T. Kita

  7th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, English, Kobe, Japan, International conference

  Oral presentation


• Effect of the accumulated Electron Density at the Hetero-Interface in Two-Step Photon-Up Conversion Solar Cells

  S. Asahi, and T. Kita

  7th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, English, Kobe, Japan, International conference

  Oral presentation


• Laser Cooling Utilizing Anti-Stokes Photoluminescence in Yb-Doped Yttrium Aluminum Garnet

  Y. Nakayama, Y. Harada, and T. Kita

  7th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, English, Kobe, Japan

  Oral presentation


• Extensively-Prolonged Electron Lifetime Within Room Temperature Upon InAs/GaAs Quantum Dot-in-Well Solar Cell

  Y. Zhu, S. Asahi, and T. Kita

  7th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, English, Kobe, Japan, International conference

  Oral presentation


• Infrared Photodetector Sensitized by QDs Inserted at the Hetero-Interface

  T. Murata, S. Asahi, and T. Kita

  7th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, English, Kobe, Japan, International conference

  Oral presentation


• Strong Voltage-Boost Effect in Two-Step Photon-Up Conversion Solar Cells

  SHIGEO ASAHI, KITA TAKASHI

  46th IEEE Photovoltaic Specialists Conference, Jul. 2019, English, Chicago, International conference

  Oral presentation


• Hot-Carrier Extraction in InAs/GaAs Quantum Dot Superlattice Solar Cells

  HARADA YUKIHIRO, IWATA NAOTO, WATANABE DAIKI, ASAHI SHIGEO, KITA TAKASHI

  46th IEEE Photovoltaic Specialists Conference, Jul. 2019, English, Chicago, International conference

  Oral presentation


• Reciprocal Relationship Between Photoluminescence and Photocurrent in Two-Step Photon Up-Conversion Solar Cell

  NORIYUKI KINUGAWA, SHIGEO ASAHI, KITA TAKASHI

  46th IEEE Photovoltaic Specialists Conference, Jun. 2019, English, Chicago, International conference

  Oral presentation


• One-Dimensional Electronic States in Highly-Stacked InAs/GaAs Quantum Dot Superlattices

  KAIZU TOSHIYUKI, KITA TAKASHI

  Compound Semiconductor Week2019, May 2019, English, Nara, International conference

  Oral presentation


• Extension of excitation energy to generate terahertz wave to smaller than GaAs bandgap energy due to growth of InAs quantum dots and nitrogen doped layer

  KOJIMA OSAMU, Kita Takashi

  Compound Semiconductor Week 2019, May 2019, English, Nara, Japan, International conference

  Oral presentation


• Efficient Hot-Carrier Generation in InAs/GaAs Quantum Dot Superlattices

  HARADA YUKIHIRO, IWATA NAOTO, WATANABE DAIKI, ASAHI SHIGEO, KITA TAKASHI

  Optics&Photonics International Congress 2019, Apr. 2019, English, Yokohama, International conference

  Oral presentation


• InAs/GaAs量子ドット超格子を用いたホットキャリア型太陽電池における開放電圧の向上

  HARADA YUKIHIRO, 岩田 尚之, ASAHI SHIGEO, KITA TAKASHI

  第66回応用物理学会春季学術講演会, Mar. 2019, Japanese, Domestic conference

  Oral presentation


• GaAs/AlAs多重量子井戸の励起子ダイナミクスと二次の非線形光学効果との関係

  KOJIMA OSAMU, KITA TAKASHI, Hogg Richard

  2019年第66回応用物理学会春季学術講演会, Mar. 2019, Japanese, 東京工業大学, Domestic conference

  Oral presentation


• (Y:Yb)AGにおける高温でのanti-Stokes発光増強

  中山 雄太, 安藤 達人, 寺田 康太, HARADA YUKIHIRO, KITA TAKASHI

  第66回応用物理学会春季学術講演会, Mar. 2019, Japanese, Domestic conference

  Oral presentation


• Voltage boost effect in two-step photon up-conversion solar cell with partial absorptivity

  Y. Harada, S. Asahi, T. Kita

  第37回電子材料シンポジウム, Oct. 2018, Japanese, Domestic conference

  Poster presentation


• Laser Cooling in Yb-Doped Yttrium Aluminum Compounds

  Y. Nakayama, T. Ando, K. Terada, Y. Harada, T. Kita

  第37回電子材料シンポジウム, Oct. 2018, Japanese, Domestic conference

  Poster presentation


• “Effects of GaAs-Capping Temperature on The Emission Wavelength of InAs Quantum Dots Grown on Nitrogen-Doped GaAs(001)Surfaces

  NAOTO UENISHI, KAIZU TOSHIYUKI, KITA TAKASHI

  20th International Conference on Molecular Beam Epitaxy, Sep. 2018, English, China, International conference

  Oral presentation


• Optimal Band Gap Energies for Two-Step Photon Up-Conversion Solar Cells with Partial Absorptivity

  YUKIHIRO HARADA, TETSUHIRO MATSUO, SHIGEO ASAHI, KITA TAKASHI

  35th European PV Solar Energy Conference and Exhibition, Sep. 2018, English, Belgium, International conference

  Oral presentation


• InAs/GaAs量子ドット超格子太陽電池におけるホットキャリア電流取り出し特性

  岩田 尚之, 渡部 大樹, HARADA YUKIHIRO, ASAHI SHIGEO, KITA TAKASHI

  第79回応用物理学会秋季学術講演会, Sep. 2018, Japanese, Domestic conference

  Oral presentation


• GaAs/AlAs多重量子井戸における第二次高調波発生

  KOJIMA OSAMU, KITA TAKASHI, Hogg Richard

  第79回応用物理学会秋季学術講演会, Sep. 2018, Japanese, 名古屋国際会議場, Domestic conference

  Oral presentation


• 2段階フォトンアップコンバージョン太陽電池における理論変換効率の入射光スペクトル形状依存性

  HARADA YUKIHIRO, 松尾 哲弘, ASAHI SHIGEO, KITA TAKASHI

  第79回応用物理学会秋季学術講演会, Sep. 2018, Japanese, Domestic conference

  Oral presentation


• 多孔質炭素電極を用いた光化学電池の基礎特性

  ENOMOTO MASAHITO, WAKAKI HIROTOMO, KAIZU TOSHIYUKI, KITA TAKASHI

  平成30年度半導体エレクトロニクス部門委員会第1回研究会, Jul. 2018, Japanese, 奈良先端科学技術大学院大学, Domestic conference

  Oral presentation


• Yb添加Fttrium-Aluminum化合物によるもの固体レーザー冷却

  NAKAYAMA YUUTA, ANDOU TATSUHITO, TERADA KOUTA, HARADA YUKIHIRO, KITA TAKASHI

  平成30年度半導体エレクトロニクス部門委員会第1回研究会, Jul. 2018, Japanese, 奈良先端科学技術大学院大学, Domestic conference

  Oral presentation


• Optimization of Excitation Wavelengh in YAG:Yb for Laser cooling

  Yuta Nakayama, Kuta Terada, Y. harada, KITA TAKASHI

  The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials, Jul. 2018, English, Nara, International conference

  Oral presentation


• Observation of electron transport in a silicon crystal using luminescence of cyanine molecule excited by energy transfer

  KOJIMA OSAMU, Ito Yukako, KITA TAKASHI

  The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials, Jul. 2018, English, Nara, International conference

  Oral presentation


• Exciton Hopping Dynamics in GaAsBi

  YUKIHIRO HARADA, T. Wilson, N.P. Hylton, J.P. David, R.D. Richards, KITA TAKASHI, N.J. Ekins-Daukes

  9th International Workshop on Bismuth-Containing Semiconductors, Jul. 2018, English, Kyoto, International conference

  Oral presentation


• Effects of Modulation of Ultrafast Transient Carrier Dynamics by Interface on Terahertz Signal

  S. YAMAMOTO, O. KOJIMA, T. KITA

  The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials, Jul. 2018, English, Nara, International conference

  Oral presentation


• Development of Mercury-Free Ultraviolet Light Emitting Devices

  KITA TAKASHI

  31st International Vacuum Nanoelectronics Conference, Jul. 2018, English, Kyoto, International conference

  [Invited]

  Invited oral presentation


• Generation of continuous terahertz wave with wide tunable range

  KOJIMA OSAMU, Hogg Richard, KITA TAKASHI

  18th International Conference on Laser Optics, Jun. 2018, English, St.Petersburg, Russia, International conference

  [Invited]

  Invited oral presentation


• Carrier Collection Efficiency of Intraband-Excited Carriers in Two-Step Photon Up-Conversion Solar Cells

  ASAHI SHIGEO, K. Nishimura, KAIZU TOSHIYUKI, KITA TAKASHI

  The 7th edition of the World Conference on Photovoltaic Energy Conversion, Jun. 2018, English, Hawaii, International conference

  Oral presentation


• 入射光スペクトル形状を考慮した2段階フォトンアップコンバージョン太陽電池の理論変換効率

  MATSUO TETSUHIRO, HARADA YUKIHIRO, ASAHI SHIGEO, KITA TAKASHI

  応用物理学会関西支部平成30年度第1回講演会, May 2018, Japanese, 神戸大学, Domestic conference

  Poster presentation


• Multiple Stacking of Capping Temperature-Controlled InAs/GaAs Quantum Dots with AlGaAs Barrier Layers for Broadband Emission

  KAIZU TOSHIYUKI, T. Koike, KITA TAKASHI

  Compound Semiconductor Week 2018, May 2018, English, Cambridge, MA, USA, International conference

  Oral presentation


• GaAs/AlAs多重量子井戸における重い正孔励起子励起下での差周波混合によるテラヘルツ電磁波の偏光特性

  SAKURAI RYO, KOJIMA OSAMU, KITA TAKASHI, Richard Hogg

  応用物理学会関西支部平成30年度第1回講演会, May 2018, Japanese, 神戸大学, Domestic conference

  Poster presentation


• Polarization Dependent Photocurrent in InAs/GaAs Quantum Dot Superlattice Solar Cells

  HARADA YUKIHIRO, J. Yamada, D. Watanabe, ASAHI SHIGEO, KITA TAKASHI

  International Conference on Nanophotonics and Nano-optoelectronics 2018, Apr. 2018, English, Yokohama, International conference

  Oral presentation


• One-Dimensional Electronic States in Closely Stacked InAs/GaAs Quantum Dots with Different Growth Temperatures

  KAIZU TOSHIYUKI, K. Hirao, KITA TAKASHI

  International Conference on Nanophotonics and Nano-optoelectronics 2018, Apr. 2018, English, Yokohama, International conference

  Oral presentation


• Extraction Efficiency of Up-Converted Electrons in Two-Step Photon Up-Conversion Solar Cells

  ASAHI SHIGEO, K. Nishimura, KAIZU TOSHIYUKI, KITA TAKASHI

  International Conference on Nanophotonics and Nano-optoelectronics 2018, Apr. 2018, English, Yokohama, International conference

  Oral presentation


• 吸収率を考慮した2段階フォトンアップコンバージョン太陽電池の理論変換効率

  HARADA YUKIHIRO, ASAHI SHIGEO, KITA TAKASHI

  第65回応用物理学会春季学術講演会, Mar. 2018, Japanese, Domestic conference

  Oral presentation


• エネルギー移動を利用したSi基板内部における電子拡散過程の観測

  KOJIMA OSAMU, Ito Yukako, KITA TAKASHI, 沈用球

  日本物第65回応用物理学会春季学術講演会理学会 第72回年次大会, Mar. 2018, Japanese, 早稲田大学, Domestic conference

  Oral presentation


• YAG:Ybにおけるanti-Stokes発光の励起波長依存性

  中山 雄太, 寺田 康太, HARADA YUKIHIRO, KITA TAKASHI

  第65回応用物理学会春季学術講演会, Mar. 2018, Japanese, Domestic conference

  Oral presentation


• InAs/GaAs量子ドット超格子を用いたホットキャリア型太陽電池動作実証

  岩田 尚之, 渡部 大樹, HARADA YUKIHIRO, ASAHI SHIGEO, KITA TAKASHI

  第65回応用物理学会春季学術講演会, Mar. 2018, Japanese, Domestic conference

  Oral presentation


• GaAs/AlAs多重量子井戸端面から放射されるテラヘルツ電磁波の偏光特性

  桜井遼, KOJIMA OSAMU, KITA TAKASHI, R. Hogg

  日本物第65回応用物理学会春季学術講演会理学会 第72回年次大会, Mar. 2018, Japanese, 早稲田大学, Domestic conference

  Oral presentation


• InAs/GaAs量子ドット超格子を用いたホットキャリア型太陽電池の動作評価

  岩田 尚之, 渡部 大樹, HARADA YUKIHIRO, ASAHI SHIGEO, KITA TAKASHI

  応用物理学会関西支部平成29年度第3回講演会, Feb. 2018, Japanese, Domestic conference

  Poster presentation


• Two-Step Photon Up-Conversion Solar Cell: Propose and Demonstration

  ASAHI SHIGEO, KITA TAKASHI

  SPIE Photonics West, Jan. 2018, English, San Francisco, International conference

  [Invited]

  Invited oral presentation


• YAG:YbにおけるAnti-Stokes発光

  中山 雄太, HARADA YUKIHIRO, KITA TAKASHI

  第28回光物性研究会, Dec. 2017, Japanese, Domestic conference

  Poster presentation


• Two-Step Photon Up-Conversion Solar Cell

  KITA TAKASHI, ASAHI SHIGEO

  MTSA2017-OptoX Nano-TeraNano8, Nov. 2017, English, Okayama, International conference

  Oral presentation


• Two-Step Photo-Excitated Electrons with Extremely-Long Lifetime in Intermedeate-band Solar Cells Using Dot-in Well Strucyure

  ASAHI SHIGEO, H. Teranishi, KAIZU TOSHIYUKI, KITA TAKASHI

  The 27th Photovoltaic Science and Engineering Conference, Nov. 2017, English, Otsu, International conference

  Oral presentation


• Two-Step Photn Up-Conversion Solar Cells Incorporating a Voltage Booster Hetero-Interface

  ASAHI SHIGEO, K. Kusaki, HARADA YUKIHIRO, KITA TAKASHI

  The 27th Photovoltaic Science and Engineering Conference, Nov. 2017, English, Otsu, International conference

  Oral presentation


• Infrared Absorption Characteristics in Two-Step Photon Up-Conversion Solar Cells

  K. Kusaki, ASAHI SHIGEO, KAIZU TOSHIYUKI, R. Tamaki, Y. Okada, KITA TAKASHI

  The 27th Photovoltaic Science and Engineering Conference, Nov. 2017, English, Otsu, International conference

  Oral presentation


• Efficient Two-Step Photocurrent in Intermediate Band Solar Cells Using Highly Homogeneous InAs/GaAs Quantum-Dot Superlattice

  K. Hirao, ASAHI SHIGEO, KAIZU TOSHIYUKI, HARADA YUKIHIRO, KITA TAKASHI

  The 27th Photovoltaic Science and Engineering Conference, Nov. 2017, English, Otsu, International conference

  Oral presentation


• Anti-Stokes photoluminescence in Yb-doped yttrium aluminum garnet

  Y. Nakayama, Y. Harada, T. Kita

  第36回電子材料シンポジウム, Nov. 2017, Japanese, Domestic conference

  Poster presentation


• One-Dimensional Miniband Formation in InAs/GaAs Quantum Dot Superlattice

  KAIZU TOSHIYUKI, KITA TAKASHI

  International Symposium on Novel Energy Nanomaterials, Catalysts and Surfaces for Future Earth -Material Research, Characterization and Imaging by In situ/Operando XAFS and X-ray Techniques-, Oct. 2017, English, Tokyo, International conference

  Oral presentation


• Laser-induced Hydrogen Production Using Porous Carbon

  M. Enomoto, Y. Kawajiri, KAIZU TOSHIYUKI, T. Uchino, Y. Ichihashi, K. Taniya, S. Nishiyama, M. Mizuhata, M. Sugiyama, M. Ueno, KITA TAKASHI

  International Symposium on Novel Energy Nanomaterials, Catalysts and Surfaces for Future Earth -Material Research, Characterization and Imaging by In situ/Operando XAFS and X-ray Techniques-, Oct. 2017, English, Tokyo, International conference

  Oral presentation


• 低温キャップInAs/GaAs量子ドット超格子中間バンド型太陽電池における熱脱出の抑制

  平尾 和輝, ASAHI SHIGEO, KAIZU TOSHIYUKI, HARADA YUKIHIRO, KITA TAKASHI

  第78回応用物理学会秋季学術講演会, Sep. 2017, Japanese, Domestic conference

  Oral presentation


• 低温キャップInAs/GaAs量子ドット超格子中間バンド型太陽電池における2段階光吸収の増強

  平尾 和輝, ASAHI SHIGEO, KAIZU TOSHIYUKI, HARADA YUKIHIRO, KITA TAKASHI

  日本材料学会半導体エレクトロニクス部門委員会平成29年度第1回研究会, Sep. 2017, Japanese, Domestic conference

  Oral presentation


• Photon Up-Converted Photocurrent in a Single Junction Solar Cell with a Hetero-Interface

  K. Kusaki, ASAHI SHIGEO, KAIZU TOSHIYUKI, KITA TAKASHI

  33rd European Photovoltaic Solar Energy Conference and Exhibition, Sep. 2017, English, Netherlands, International conference

  Oral presentation


• Increasing Photovoltage Boosted by Photon Up-Conversion in a Single-Junction Solar Cell with a Hetero-Interface

  ASAHI SHIGEO, K. Kusaki, KAIZU TOSHIYUKI, KITA TAKASHI

  33rd European Photovoltaic Solar Energy Conference and Exhibition, Sep. 2017, English, Netherlands, International conference

  Oral presentation


• InAs/GaAs量子ドット超格子太陽電池におけるバンド内遷移の偏光特性

  HARADA YUKIHIRO, 山田 淳也, 渡部 大樹, ASAHI SHIGEO, KITA TAKASHI

  第78回応用物理学会秋季学術講演会, Sep. 2017, Japanese, Domestic conference

  Oral presentation


• Generation of continuous terahertz wave by differential-frequency-mixing in a GaAs/AlAs multiple quantum well

  KOJIMA OSAMU, Y. Tarui, KITA TAKASHI, A. Majeed, E. Clark, P. Ivanov, R. Hogg

  Nanophotonics and Micro/Nano Optics International Conference 2017, Sep. 2017, English, Barcelona, Spain, International conference

  Oral presentation


• Extended Optical Response of Two-Step Photoexcitation in InAs/GaAs Quantum-Dot Superlattice Intermediate Band Solar Cells

  K. Hirao, ASAHI SHIGEO, KAIZU TOSHIYUKI, KITA TAKASHI

  33rd European Photovoltaic Solar Energy Conference and Exhibition, Sep. 2017, English, Netherlands, International conference

  Oral presentation


• Carrier Dynamics in Photon Up-Conversion Solar Cells

  KITA TAKASHI, ASAHI SHIGEO

  SemiconNano 2017: 6th International Workshop Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, Sep. 2017, English, Milano, International conference

  Oral presentation


• Stokes and Anti-Stokes Photoluminescence in Nitrogen ð-Doped Layer in GaAs

  HARADA YUKIHIRO, Y. Ogawa, KAIZU TOSHIYUKI, KITA TAKASHI

  29th International Conference on Defects in Semiconductors, Jul. 2017, English, Matsue, International conference

  Oral presentation


• Increasing Current Generation by Photon Up-Conversion in a Single-Junction Solar Cell with a Hetero-Interface

  ASAHI SHIGEO, K. Kusaki, KAIZU TOSHIYUKI, KITA TAKASHI

  2017 IEEE Photovoltaic Specialists Conference, Jun. 2017, English, Washington D.C., International conference

  Oral presentation


• レーザー冷却に向けたYbドープ酸化物の作製

  中山 雄太, 尾崎 勝也, 石原 嗣生, HARADA YUKIHIRO, KITA TAKASHI

  応用物理学会関西支部平成29年度第1回講演会, May 2017, Japanese, Domestic conference

  Poster presentation


• Broadband Control of Polarization Characteristics in Closely-Stacked InAs/GaAs Quantum Dots

  KAIZU TOSHIYUKI, Y. Tajiri, KITA TAKASHI

  Compound Semiconductor Week 2017, May 2017, English, Berlin, International conference

  Oral presentation


• Control of Carrier Dynamics and Efficient Two-Step Photon Up-Conversion in Quantum-Dot Intermediate-Band Solar Cells

  KITA TAKASHI

  2017 MRS Spring Meeting and Exhibit, Apr. 2017, English, Arizona, International conference

  [Invited]

  Invited oral presentation


• InAs量子ドット周辺の歪み制御によるGaAs表面からのテラヘルツ電磁波発生波長の長波長化

  KOJIMA OSAMU, Ryo Izumi, Takashi Kita

  第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, パシフィコ横浜, Domestic conference

  Oral presentation


• GaAs中のエピタキシャル窒素膜における反ストークス発光

  HARADA YUKIHIRO, 小川 泰弘, KAIZU TOSHIYUKI, KITA TAKASHI

  第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, Domestic conference

  Oral presentation


• GaAs/AlAs多重量子井戸における波形制御パルスによる量子ビート生成III

  KOJIMA OSAMU, KITA TAKASHI, 赤羽浩一

  日本物理学会 第72回年次大会, Mar. 2017, Japanese, 大阪大学, Domestic conference

  Oral presentation


• Effects of exciton oscillator strength on terahertz generation due to differential-wave-mixing in GaAs/AlAs multiple quantum wells

  Y. Tarui, KOJIMA OSAMU, Takashi Kita, A. Majeed, P. Ivanov, E. Clarke, R. Hogg

  日本物理学会 第72回年次大会, Mar. 2017, Japanese, 大阪大学, Domestic conference

  Oral presentation


• Si基板からシアニン分子薄膜へのエネルギー移動による発光に対するキャリア拡散の効果

  Ito Yukako, KOJIMA OSAMU, KITA TAKASHI, 沈用球

  第27回光物性研究会, Dec. 2016, Japanese, 神戸大学, Domestic conference

  Poster presentation


• GaAs中のデルタドーピング窒化層を利用した光によるフォノン制御

  小川 泰弘, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  第27回光物性研究会, Dec. 2016, Japanese, Domestic conference

  Poster presentation


• GaAs/AlAs多重量子井戸における励起子励起条件下での差周波混合によるテラヘルツ電磁波の高効率発生

  樽井雄規, KOJIMA OSAMU, KITA TAKASHI, A. Majeed, P. Ivanov, E. Clarke, R. Hogg

  第27回光物性研究会, Dec. 2016, Japanese, 神戸大学, Domestic conference

  Poster presentation


• Variation of Terahertz Wave Characteristics Due to Covering InAs Quantum Dots by Nitrogen Atoms

  KOJIMA OSAMU, R. Izumi, KITA TAKASHI

  Asian Conference on Nanoscience and Nanotechnology 2016, Oct. 2016, English, Sapporo, International conference

  Oral presentation


• Photo-Emission of Cyanine Molecule Thin Films on Si Substrate Due to Inorganic-Organic Energy Transfer

  Y. Ito, KOJIMA OSAMU, KITA TAKASHI, Y. G. Shim

  Asian Conference on Nanoscience and Nanotechnology 2016, Oct. 2016, English, Sapporo, International conference

  Oral presentation


• Observation of strain variation due to quantum dots by terahertz wave emission

  KOJIMA OSAMU, Ryo Izumi, Takashi Kita

  第77回応用物理学会秋季学術講演会, Sep. 2016, Japanese, 朱鷺メッセ, Domestic conference

  Oral presentation


• Two-dimensional delocalized electronic states of epitaxial N d-doped layer in GaAs

  Y. Harada, Y. Ogawa, T. Kaizu, T. Kita

  Energy, Materials, and Nanotechnology Meeting on Epitaxy, Sep. 2016, English, International conference

  [Invited]

  Invited oral presentation


• Nanosecond-scale hot-carrier cooling dynamics in one-dimensional InAs/GaAs quantum dot superlattices

  Y. Harada, N. Kasamatsu, D. Watanabe, T. Kita

  HEMP 2016: Hot Electrons and Solar Energy, Sep. 2016, English, International conference

  [Invited]

  Invited oral presentation


• InAs/GaAs量子ドット中間バンド型太陽電池における電子の熱脱出過程の解明

  平尾 和輝, 渡辺 翔, ASAHI SHIGEO, KAIZU TOSHIYUKI, HARADA YUKIHIRO, KITA TAKASHI

  第77回応用物理学会秋季学術講演会, Sep. 2016, Japanese, Domestic conference

  Oral presentation


• Control In-Ga Intermixing in InAs Quantum Dot on Nitrogen δ-Doped GaAs

  KAIZU TOSHIYUKI, KITA TAKASHI

  19th International Conference on Molecular-Beam Epitaxy, Sep. 2016, English, Montpellier, International conference

  Oral presentation


• Carrier Dynamics in InAs Quantum Dot Solar Cell for Photon Ratchet

  KITA TAKASHI

  HEMP 2016: Hot Electrons and Solar Energy, Sep. 2016, English, London, International conference

  [Invited]

  Invited oral presentation


• Spatial Electronic Structure of an Isovalent Nitrogen Center in GaAs

  R. Plantenga, V. Kortan, KAIZU TOSHIYUKI, HARADA YUKIHIRO, KITA TAKASHI, M. Flatte, P. Koenraad

  33rd International Conference on the Physics of Semiconductors, Aug. 2016, English, Beijing, International conference

  Oral presentation


• Thermal carrier-escape process from the intermediate band in InAs/GaAs quantum dot solar cells

  K. Hirao, S. Asahi, S. Watanabe, T. Kaizu, Y. Harada, T. Kita

  第35回電子材料シンポジウム, Jul. 2016, Japanese, Domestic conference

  Poster presentation


• Polarization-Insensitive Intraband Transition in InAs/GaAs Quantum Dot Superlattices

  HARADA YUKIHIRO, J. Yamada, D. Watanabe, S. Asahi, KITA TAKASHI

  UK Semiconductors 2016, Jul. 2016, English, Sheffield, International conference

  Oral presentation


• Two-Dimensional Energy Dispersion in Thermally Annealed Epitaxial Nitrogen Atomic Sheet in GaAs

  Y. Ogawa, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  2016 Compound Semiconductor Week, Jun. 2016, English, Toyama, International conference

  Oral presentation


• Polarization Anisotropy of Electroluminescence and Net-Modal Gain in Highly Stacked InAs/GaAs Quantum-Dot Laser Devices

  KAIZU TOSHIYUKI, M. Suwa, T. Andachi, HARADA YUKIHIRO, KITA TAKASHI

  2016 Compound Semiconductor Week, Jun. 2016, English, Toyama, International conference

  Oral presentation


• GaAs First-Spacer-Layer Thickness Dependence of Polarized Photoluminescence Properties of Closely-Stacked InAs/GaAs Quantum Dots with Long-Wavelength Emission

  Y. Tajiri, KAIZU TOSHIYUKI, KITA TAKASHI

  2016 Compound Semiconductor Week, Jun. 2016, English, Toyama, International conference

  Oral presentation


• Extended Electron Lifetime in Intermediate-Band Solar Cells Using Dot-in-Well Structure

  S. Asahi, H. Teranishi, S. Watanabe, T. Kada, KAIZU TOSHIYUKI, KITA TAKASHI

  32nd European Photovoltaic Solar Energy Conference and Exhibition, Jun. 2016, English, Munich, International conference

  Oral presentation


• Enhancement of Two-Step Photon Absorption Due to Miniband Formation in InAs/GaAs Quantum Dot Superlattice Solar Cell

  S. Watanabe, S. Asahi, T. Kada, KAIZU TOSHIYUKI, HARADA YUKIHIRO, KITA TAKASHI

  32nd European Photovoltaic Solar Energy Conference and Exhibition, Jun. 2016, English, Munich, International conference

  Oral presentation


• 急速熱アニールしたGaAs中のエピタキシャル窒素膜の輻射再結合寿命

  小川 泰弘, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  第63回応用物理学会春季学術講演会, Mar. 2016, Japanese, Domestic conference

  Oral presentation


• Time-Resolved Photoluminescence of Thermally-Annealed Nitrogen Atomic Sheet in GaAs

  Y. Ogawa, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  17th International Conference on Physics of Light-Matter Coupling in Nanostructures, Mar. 2016, English, Nara, International conference

  Oral presentation


• Polarized Photoluminescence Properties of Closely-Stacked InAs/GaAs Quantum Dots with Long-Wavelength Emission

  KAIZU TOSHIYUKI, Y. Tajiri, KITA TAKASHI

  17th International Conference on Physics of Light-Matter Coupling in Nanostructures, Mar. 2016, English, Nara, International conference

  Oral presentation


• InAs/GaAs量子ドット超格子太陽電池におけるミニバンド形成が2段階光吸収に与える影響

  渡辺 翔, 朝日 重雄, 加田 智之, KAIZU TOSHIYUKI, HARADA YUKIHIRO, KITA TAKASHI

  第63回応用物理学会春季学術講演会, Mar. 2016, Japanese, Domestic conference

  Oral presentation


• Extremely Long Carrier Lifetime Due to Electron-Hole Separation in Quantum-Dot Intermediate-Band Solar Cells

  S. Asahi, H. Teranishi, T. Kada, KAIZU TOSHIYUKI, KITA TAKASHI

  17th International Conference on Physics of Light-Matter Coupling in Nanostructures, Mar. 2016, English, Nara, International conference

  Oral presentation


• Effective Drift Mobility Approximation in Multiple Quantum-Well Solar Cells

  Kasidit Toprasertpong, Tomoyuki Inoue, Kentaroh Watanabe, KITA TAKASHI, Masakazu Sugiyama, Yoshiaki Nakano

  SPIE Photonics West, Feb. 2016, English, San Francisco, International conference

  Oral presentation


• ポリマー薄膜中のコロイドPbS量子ドットにおけるパリティ選択則の緩和

  廣田 舞, 芝川 忠慶, HARADA YUKIHIRO, KITA TAKASHI

  日本材料学会半導体エレクトロニクス部門委員会平成27年度第1回研究会, Nov. 2015, Japanese, Domestic conference

  Oral presentation


• Decrease in Photoluminescence Decay Rate in InAs Quantum Dots Coupling with In Nanoparticles Due to Increase in Excitation Power

  KOJIMA OSAMU, T. Taji, KITA TAKASHI, C. Y. Jin, J. Yuan, R. Nozel

  2nd International Conference on Enhanced Spectroscopies, Oct. 2015, English, Messina, International conference

  Oral presentation


• ポリマー膜中のPbSコロイド量子ドットにおける磁気光学応答のヒステリシス特性

  HARADA YUKIHIRO, 芝川 忠慶, 廣田 舞, KITA TAKASHI, SAKURAI TAKAHIRO, OHTA HITOSHI

  日本物理学会2015年秋季大会, Sep. 2015, Japanese, Domestic conference

  Poster presentation


• NGCPV: a New Generation of Concentrator Photovoltaic Cells, Modules and Systems (a Final Review)

  A. Datas, A. B. Cristobal, G. Sala, I. Anton Hernandez, J. C. Minano, P. Benitez, A. Marti Vega, A. Luque, A. W. Bett, G. Siefer, N. J. Ekins-Daukes, F. Roca, C. Cancro, I. Luque-Heredia, W. Warmuth, M. Baudrit, Y. Okada, M. Sugiyama, Y. Hishikawa, T. Takamoto, K. Araki, A. Fukuyama, K. Nishioka, H. Suzuki, N. Kuze, Y. Moriyasu, KITA TAKASHI, A. Kotagiri, N. Kojima, M. Yamaguchi

  EU PVSEC 2015, Sep. 2015, English, Hamburg, International conference

  Oral presentation


• InAs/GaAs量子ドット超格子を利用したホットキャリア型太陽電池

  渡部 大樹, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  第76回応用物理学会秋季学術講演会, Sep. 2015, Japanese, Domestic conference

  Oral presentation


• InAs/GaAs量子ドット超格子におけるホットキャリア冷却過程

  HARADA YUKIHIRO, 笠松 直史, 渡部 大樹, KITA TAKASHI

  第76回応用物理学会秋季学術講演会, Sep. 2015, Japanese, Domestic conference

  Oral presentation


• Growth and Characterization of InAs/GaAs Quantum Dot Superlattices for Photovoltaics

  KITA TAKASHI

  5th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, Sep. 2015, English, Taiwan, International conference

  [Invited]

  Invited oral presentation


• Epitaxial Nitrogen Atomic Sheet in GaAs Grown by Nitorogen δ-Doping Technique

  HARADA YUKIHIRO, T. Baba, Y. Ogawa, KAIZU TOSHIYUKI, KITA TAKASHI

  5th International Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, Sep. 2015, English, Taiwan, International conference

  [Invited]

  Invited oral presentation


• Carrier Dynamics in InA s /GaAs Quantum Dot Superlattices for Photovoltaics

  KITA TAKASHI

  High-efficiency materials for photovoltaics, Sep. 2015, English, London, International conference

  [Invited]

  Invited oral presentation


• 急速熱アニールによるGaAs中のエピタキシャル窒素シートにおける2次元物性の制御

  小川 泰弘, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  日本材料学会半導体エレクトロニクス部門委員会平成27年度第1回研究会, Jul. 2015, Japanese, Domestic conference

  Oral presentation


• Relaxation of Parity Selection Rules in Colloidal PbS Quantum Dots Embedded in Polymer Films

  M. Hirota, T. Shibakawa, HARADA YUKIHIRO, KITA TAKASHI

  21st International Conference on Electronic Properties of Two-Dimensional Systems/17th International Conference on Modulated Semiconductor Structures, Jul. 2015, English, Sendai, International conference

  Oral presentation


• Hot-Carrier Distribution in InAs/GaAs Quantum Dot Superlattices and Its Application to Solar Cells

  D. Watanabe, N. Kasamatsu, Y. Harada, T. Kita

  34th Electronic Materials Symposium, Jul. 2015, Japanese, Domestic conference

  Poster presentation


• Exciation of Cyanine Dye Thin Film Via Energy Transfer from a Si Substrate

  Y. Ito, O. Kojima, KITA TAKASHI, Y. G. Shim

  21st International Conference on Electronic Properties of Two-Dimensional Systems/17th International Conference on Modulated Semiconductor Structures, Jul. 2015, English, Sendai, International conference

  Oral presentation


• Enhancement of Two Dimensionality in Epitaxial Nitrogen Atomic Sheet in GaAs by Rapid Thermal Annealing

  HARADA YUKIHIRO, Y. Ogawa, T. Baba, KAIZU TOSHIYUKI, KITA TAKASHI

  21st International Conference on Electronic Properties of Two-Dimensional Systems/17th International Conference on Modulated Semiconductor Structures, Jul. 2015, English, Sendai, International conference

  Oral presentation


• Effects of Homogeneous and Inhomogeneous Broadenings of Excitons on Amplitude of Exciton Quantum Beats

  KOJIMA OSAMU, KITA TAKASHI

  21st International Conference on Electronic Properties of Two-Dimensional Systems/17th International Conference on Modulated Semiconductor Structures, Jul. 2015, English, Sendai, International conference

  Oral presentation


• Broadband Control of Emission Wavelength of InAs/GaAs Quantum Dots by Growth Temperature GaAs Capping Layer

  T. Kaizu, T. Matsumura, KITA TAKASHI

  21st International Conference on Electronic Properties of Two-Dimensional Systems/17th International Conference on Modulated Semiconductor Structures, Jul. 2015, English, Sendai, International conference

  Oral presentation


• Annealing effects on the delocalized electronic states of epitaxial two-dimensional nitrogen atomic sheet in GaAs

  Y. Ogawa, Y. Harada, T. Baba, T. Kaizu, T. Kita

  34th Electronic Materials Symposium, Jul. 2015, Japanese, Domestic conference

  Poster presentation


• Ultrafast Photocarrier Transport Dynamics in InAs/GaAs Quantum Dot Superlattice Solar Cell

  T. Tanibuchi, T. Kada, N. Kasamatsu, T. Matsumura, S. Asahi, KITA TAKASHI

  42nd IEEE Photovoltaic Specialists Conference, Jun. 2015, English, New Orleans, International conference

  Oral presentation


• Two-Step Photocarrier Generation in InAs/GaAs Quantum Dot Superlattice Intermediate Band Solar Cell

  T. Kada, T. Tanibuchi, S. Asahi, T. Kaizu, Y. Harada, KITA TAKASHI, R. Tamaki, Y. Okada, K. Miyano

  42nd IEEE Photovoltaic Specialists Conference, Jun. 2015, English, New Orleans, International conference

  Oral presentation


• Time-Resolved Photoluminescence of MBE-Grown leV GaAsSbN for Multi-Junction Solar Cells

  T. Thomas, N. Kasamatsu, K. H. Tan, S. Wicaksono, W. K. Loke, S. F. Yoon, A. Johnson, KITA TAKASHI, N. E-Daukes

  42nd IEEE Photovoltaic Specialists Conference, Jun. 2015, English, New Orleans, International conference

  Oral presentation


• Saturable Two-Step Photocurrent Generation in Intermediate-Band Solar Cells Including InAs Quantum Dots Embedded in Al0.3Ga0.7As/GaAs Quantum Wells

  S. Asahi, H. Teranishi, N. Kasamatsu, T. Kada, T. Kaizu, KITA TAKASHI

  42nd IEEE Photovoltaic Specialists Conference, Jun. 2015, English, New Orleans, International conference

  Oral presentation


• Comparison of Electron and Hole Mobilities in Multiple Quantum Well Solar Cells Using a Time-of-Flight Technique

  K. Toprasertpong, T. Tanibuchi, H. Fujii, T. Kada, S. Asahi, K. Watanabe, M. Sugiyama, KITA TAKASHI, Y. Nakano

  42nd IEEE Photovoltaic Specialists Conference, Jun. 2015, English, New Orleans, International conference

  Oral presentation


• Hot-Carrier Cooling Dynamics in InAs/GaAs Quantum Dot Superlattices

  HARADA YUKIHIRO, N. Kasamatsu, D. Watanabe, KITA TAKASHI

  11th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials, Montreal, May 2015, English, Montreal, International conference

  Oral presentation


• 半導体量子井戸における励起子量子ビートのポンプ光エネルギー依存性

  Kojima Osamu, Kita Takashi

  第75回応用物理学会秋季学術講演会, Mar. 2015, Japanese, 東海大学, Domestic conference

  Oral presentation


• ポリマー薄膜中のコロイドPbS量子ドットにおける励起緩和過程の偏光異方性

  廣田 舞, 芝川 忠慶, HARADA YUKIHIRO, KITA TAKASHI

  第62回応用物理学会春季学術講演会, Mar. 2015, Japanese, Domestic conference

  Oral presentation


• シアニン色素薄膜におけるエネルギー移動による励起子緩和時間の制御

  Junpei Nagauchi, Kojima Osamu, Kita Takashi, Akahane Kouichi

  第75回応用物理学会秋季学術講演会, Mar. 2015, Japanese, 東海大学, Domestic conference

  Oral presentation


• InAs/GaAs量子ドット超格子におけるホットキャリアダイナミクス

  HARADA YUKIHIRO, 渡部 大樹, 笠松 直史, KITA TAKASHI

  日本物理学会第70回年次大会（2015年）, Mar. 2015, Japanese, Domestic conference

  Oral presentation


• GaAs中のエピタキシャル二次元窒素膜におけるアニール効果

  HARADA YUKIHIRO, 小川 泰弘, 馬場 健, KAIZU TOSHIYUKI, KITA TAKASHI

  第62回応用物理学会春季学術講演会, Mar. 2015, Japanese, Domestic conference

  Oral presentation


• ポリマー薄膜中のコロイドPbS量子ドットにおける励起緩和過程の偏光異方性

  廣田 舞, 芝川 忠慶, HARADA YUKIHIRO, KITA TAKASHI

  第24回光物性研究会, Dec. 2014, Japanese, Domestic conference

  Poster presentation


• Layer-by-Layer法によるシアニン色素積層薄膜の作製と励起子緩和特性の評価

  Junpei Nagauchi, Kojima Osamu, Kita Takashi, Akahane Kouichi

  第25回光物性研究会, Dec. 2014, Japanese, 神戸大学, Domestic conference

  Oral presentation


• InAs/GaAs量子ドット太陽電池におけるキャリア脱出の影響

  笠松 直史, 加田 智之, 渡部 大樹, HARADA YUKIHIRO, KITA TAKASHI

  第24回光物性研究会, Dec. 2014, Japanese, Domestic conference

  Poster presentation


• GaAs中のエピタキシャル2次元窒素シート非局在電子状態の発光ダイナミクス

  馬場 健, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  第24回光物性研究会, Dec. 2014, Japanese, Domestic conference

  Poster presentation


• GaAs/AlAs多重量子井戸におけるダブルパルス法による励起子量子ビート制御

  Kojima Osamu, Kita Takashi, Akahane Kouichi

  第25回光物性研究会, Dec. 2014, Japanese, 神戸大学, Domestic conference

  Oral presentation


• 低次元量子構造を利用したホットキャリア型太陽電池の提案

  渡部 大樹, 笠松 直史, HARADA YUKIHIRO, KITA TAKASHI

  日本材料学会半導体エレクトロニクス部門委員会平成26年度第2回研究会, Nov. 2014, Japanese, Domestic conference

  Oral presentation


• ポリマー中に埋め込まれたPbSコロイド量子ドットにおける磁気発光強度のヒステリシス特性

  芝川 忠慶, 廣田 舞, HARADA YUKIHIRO, KITA TAKASHI

  日本材料学会半導体エレクトロニクス部門委員会平成26年度第2回研究会, Nov. 2014, Japanese, Domestic conference

  Oral presentation


• Ultrafast Optical Switch Based on Quantum Beat Oscillation in GaAs/AlAs Multiple Quantum Well

  KOJIMA OSAMU, KITA TAKASHI, K. Akahane

  International Symposium on Recent Progress of Photonic Devices and Materials, Nov. 2014, English, Kobe University, International conference

  [Invited]

  Invited oral presentation


• Two-dimensional electronic states of epitaxial nitrogen atomic sheet in GaAs

  Y. Harada, T. Baba, T. Kaizu, T. Kita

  International Symposium on Recent Progress of Photonic Devices and Materials, Nov. 2014, English, International conference

  [Invited]

  Invited oral presentation


• Suppression of Thermal Carrier Escape and Efficient Photo-Carrier Generation by Two-Step Photon Absorption in Intermediate-Band Solar Cells Using a Dot-in-Well Structure

  S. Asahi, H. Teranishi, N. Kasamatsu, T. Kada, KAIZU TOSHIYUKI, KITA TAKASHI

  6th World Conference on Photovoltaic Energy Conversion, Nov. 2014, English, Kyoto International Conference Center, International conference

  Oral presentation


• Photoluminescence Decay Dynamics in Epitaxial Two-Dimensional Nitrogen Atomic Sheet in GaAs

  T. Baba, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  International Symposium on Recent Progress of Photonic Devices and Materials, Nov. 2014, English, Kobe University, International conference

  Oral presentation


• Modulation of Photoluminescence Properties of InAs Quantum Dots on Nitrogen δ-Doped GaAs

  KAIZU TOSHIYUKI, KITA TAKASHI

  International Symposium on Recent Progress of Photonic Devices and Materials, Nov. 2014, English, Kobe University, International conference

  Oral presentation


• Hot Carrier Intermediate Band Solar Cell Using Low-Dimensioned Quantum Structures

  D. Watanabe, N. Kasamatsu, T. Kada, S. Asahi, HARADA YUKIHIRO, KITA TAKASHI

  WCPEC-6, Nov. 2014, English, Kyoto International Conference Center, International conference

  Oral presentation


• Growth and Characterization of Stacked InAs/GaAs Quantum Dots for Photovoltaics

  KITA TAKASHI

  International Symposium on Recent Progress of Photonic Devices and Materials, Nov. 2014, English, Kobe University, International conference

  [Invited]

  Invited oral presentation


• Fabrication and Characterization of Cyanine Dye Thin Films Grown by a Layer-by -Layer Method

  N. Nagauchi, KOJIMA OSAMU, KITA TAKASHI, Y. Shim

  International Symposium on Recent Progress of Photonic Devices and Materials, Nov. 2014, English, Kobe University, International conference

  Oral presentation


• Efficient Two-Step Photon Absorption in InAs/GaAs Quantum Dot Solar Cells

  T. Kada, S. Asahi, KITA TAKASHI, R. Tamaki, Y. Okada, K. Miyano

  WCPEC-6, Nov. 2014, English, Kyoto International Conference Center, International conference

  Oral presentation


• Control of Electronic States Colloidal PbS Quantum Dots Embedded in Polymer Films

  M. Hirota, T. Shibakawa, HARADA YUKIHIRO, KITA TAKASHI

  International Symposium on Recent Progress of Photonic Devices and Materials, Nov. 2014, English, Kobe University, International conference

  Oral presentation


• Thermal enhancement of exciton quantum beat in a GaAs/AlAs multiple quantum well

  KOJIMA OSAMU, KITA TAKASHI, K. Akahane

  6th Szeged International Workshop on Advances in Nanoscience 2014, Oct. 2014, English, Hotel Forrás, Szeged, Domestic conference

  Oral presentation


• Photoluminescence Properties of InAs Quantum Dots on Nitrogen δ-Doped GaAs

  KAIZU TOSHIYUKI, KITA TAKASHI

  Eleventh International Conference on Flow Dynamics, Oct. 2014, English, Sendai, International conference

  Oral presentation


• 低次元量子構造を利用したホットキャリア中間バンド型太陽電池

  渡部 大樹, 笠松 直史, HARADA YUKIHIRO, KITA TAKASHI

  第75回応用物理学会学術講演会, Sep. 2014, Japanese, Domestic conference

  Oral presentation


• 光スイッチ応用へ向けたシアニン色素薄膜の作製

  Junpei Nagauchi, Kojima Osamu, Kita Takashi, Akahane Kouichi

  第75回応用物理学会秋季学術講演会, Sep. 2014, Japanese, 北海道大学, Domestic conference

  Oral presentation


• ダブルパルス-ポンプ-プローブ法による高温下での励起子量子ビートの観測

  Kojima Osamu, Kita Takashi, Akahane Kouichi

  第75回応用物理学会秋季学術講演会, Sep. 2014, Japanese, 北海道大学, Domestic conference

  Oral presentation


• GaAs中のエピタキシャル二次元窒素膜の電子状態 (II)

  HARADA YUKIHIRO, 馬場 健, KAIZU TOSHIYUKI, KITA TAKASHI

  第75回応用物理学会学術講演会, Sep. 2014, Japanese, Domestic conference

  Oral presentation


• GaAs中のエピタキシャル二次元窒素膜における発光ダイナミクス

  馬場 健, HARADA YUKIHIRO, KAIZU TOSHIYUKI, KITA TAKASHI

  第75回応用物理学会学術講演会, Sep. 2014, Japanese, Domestic conference

  Oral presentation


• GaAs/AlAs 多重量子井戸におけるアップコンバージョン発光

  Kojima Osamu, Shouhei Okumura, Kita Takashi, Akahane Kouichi

  日本物理学会 2014年秋季大会, Sep. 2014, Japanese, 中部大学, Domestic conference

  Oral presentation


• Two-dimensional electronic states of epitaxial nitrogen atomic sheet in GaAs grown by nitrogen delta-doping technique

  Y. Harada, T. Baba, T. Kita

  32nd International Conference on Physics of Semiconductors, Aug. 2014, English, International conference

  Oral presentation


• Low-Power Pulse Modulation Based on Exciton Quantum Beat in a GaAs/AlAs Multiple Quantum Well

  KOJIMA OSAMU, KITA TAKASHI, K. Akahane

  UK Semiconductors 2014, Jul. 2014, English, Sheffield Hallam University, International conference

  Poster presentation


• Enhancement of interaction among nitrogen pair centers in epitaxial two-dimensional nitrogen atomic sheet in GaAs

  T. Baba, Y. Harada, T. Kaizu, T. Kita

  33rd Electronic Materials Symposium, Jul. 2014, Japanese, Domestic conference

  Poster presentation


• Carrier Dynamics and Two-Step Photon Absorption in InAs/GaAs Quantum Dot Intermediate Band Solar Cells

  KITA TAKASHI

  HEMP 2014, Jul. 2014, English, Imperial College London, International conference

  Oral presentation


• Carrier Time-of-Flight Measurement Using a Probe Structure for Direct Evaluation of Carrier Transport in Quantum Structure Solar Cells

  K. Toprasertpong, N. Kasamatsu, H. Fujii, T. Kada, S. Asahi, Y. Wang, K. Watanabe, M. Sugiyama, KITA TAKASHI, Y. Nakano

  40th IEEE Photovoltaic Specialists Conference, Jun. 2014, English, International conference

  Oral presentation


• Structural Modification of InAs Quantum Dots Grown on Nitrided GaAs(001)Surface

  KAIZU TOSHIYUKI, K. Taguchi, KITA TAKASHI

  8th International Conference on Quantum Dots, May 2014, English, Pisa, International conference

  Poster presentation


• 窒素δドープGaAs(001)層上のInAs量子ドット自己形成

  KAIZU TOSHIYUKI, 田口 航平, KITA TAKASHI

  第61回応用物理学会春季学術講演会, Mar. 2014, Japanese, 応用物理学会, 神奈川, Domestic conference

  Oral presentation


• InAs/GaAs量子ドット太陽電池の量子準位を介した２段階光吸収

  加田 智之, 朝日 重雄, KAIZU TOSHIYUKI, KITA TAKASHI, 玉置 亮, 宮野 健次郎, 岡田 至崇

  第61回応用物理学会春季学術講演会, Mar. 2014, Japanese, 応用物理学会, 神奈川, Domestic conference

  Oral presentation


• InAs/AlxGa1-xAs量子ドットにおけるキャリアの熱活性特性

  朝日 重雄, 寺西 陽之, 笠松 直史, 加田 智之, KAIZU TOSHIYUKI, KITA TAKASHI

  第61回応用物理学会春季学術講演会, Mar. 2014, Japanese, 応用物理学会, 神奈川, Domestic conference

  Oral presentation


• GaAs中のエピタキシャル二次元窒素膜の電子状態

  HARADA YUKIHIRO, 馬場 健, KITA TAKASHI

  第61回応用物理学会春季学術講演会, Mar. 2014, Japanese, 青山学院大学, Domestic conference

  Oral presentation


• Intraband Carrier Dynamics in Self-Assembled Quantum Dots for Infrared Optical Devices

  Y. Harada, T. Maeda, KITA TAKASHI

  EMN Fall Meeting, Dec. 2013, English, Orland, Florida, USA, International conference

  [Invited]

  Invited oral presentation


• InAs/GaAs量子ドットにおけるbound-to-continuum型サブバンド間遷移の吸収係数

  HARADA YUKIHIRO, 前田 剛志, KITA TAKASHI

  第23回光物性研究会, Dec. 2013, Japanese, 大阪市立大学, Domestic conference

  Poster presentation


• GaAs中におけるエピタキシャル2次元窒素膜の磁気発光特性

  馬場 健, 山本 益輝, HARADA YUKIHIRO, KITA TAKASHI

  第23回光物性研究会, Dec. 2013, Japanese, 大阪市立大学, Domestic conference

  Poster presentation


• Fabrication of InAs Quantum Dots on Nitrided GaAs (001) Surface

  KAIZU TOSHIYUKI, KITA TAKASHI

  10th International Conference on Flow Dynamics, Nov. 2013, English, Sendai International Center, International conference

  Oral presentation


• NGCPV: A New Generation of Concentrator Photovoltaic Cells, Modules and Systems

  A. Datas, A. B. Cristobal, G. Sala, I. Anton, J. C. Minano, P. Benitez, A. W. Bett, G. Siefer, N. J. Ekins-Daukes, F. Roca, I. Luque-Heredia, W. Warmuth, J. Merten, Y. Okada, M. Sugiyama, Y. Hishikawa, T. Takamoto, K. Araki, A. Fukuyama, N. Kuze, KITA TAKASHI, A. Kotagiri, A. Marti, M. Yamaguchi, A. Luque

  EU PVSEC 2013, Oct. 2013, English, Paris, International conference

  Oral presentation


• 積層方向を制御した InAs/GaAs量子ドットの発光偏光特性

  HARADA YUKIHIRO, 別所 侑亮, KITA TAKASHI, 田口 英次, 保田 英洋

  日本物理学会2013年秋季大会, Sep. 2013, Japanese, 徳島大学, Domestic conference

  Poster presentation


• Large Optical Spin-Splitting in the GdN Electronic States

  R. Vidyasagar, KITA TAKASHI, T. Sakurai, OHTA HITOSHI

  2013 JSAP-MRS Joint Symposia, Sep. 2013, English, Kyoto, International conference

  Oral presentation


• Gd Doping in AIN and Bright Ultraviolet Light Emission

  KITA TAKASHI

  NSF Workshop on US-Japan Frontiers in Novel Photonic-Magnetic Devices, Sep. 2013, English, Kasugano-so, Nara, International conference

  [Invited]

  Invited oral presentation


• Fabrication and characterization of bilayer thin films of cyanine dyes by a layer-by-layer method towards realization of ultrafast response device with high repetition rate

  KOJIMA OSAMU, FUJII RYOJI, KITA TAKASHI

  The 12th European Conference on Molecular Electronics, Sep. 2013, English, London, UK, International conference

  Poster presentation


• Electron Localization in GaAs:N Grown by Using δ-Doping Technique

  HARADA YUKIHIRO, M. Yamamoto, T. Baba, KITA TAKASHI

  2013 JSAP-MRS Joint Symposia, Sep. 2013, English, Doshisya University, International conference

  Oral presentation


• Effects of Built-in Electric Field on External Quantum Efficiency of InAs/GaAs Quantum Dot Interdimediate Band Solar Cell

  T. Kada, A. Hasegawa, KITA TAKASHI

  2013 JSAP-MRS Joint Symposia, Sep. 2013, English, Kyoto, International conference

  Oral presentation


• Bright Ultraviolet Light Emitting Devices Using AlGdN

  KITA TAKASHI, Y. Ishidu, K. Ichii, S. Kitayama, Y.Chigi, T. Nishimoto, H. Tanaka, M. Kobayashi, T. Ishihara, H. Izumi

  2013 JSAP-MRS Joint Symposia, Sep. 2013, English, Kyoto, International conference

  [Invited]

  Invited oral presentation


• Optical Characteristics of Quantum Dot Ensembles Grown by Using the Strain Compensation Technique

  KOJIMA OSAMU, KITA TAKASHI, K. Akahane

  Collaborative Conference on Materials Research (CCMR) 2013, Jun. 2013, English, Jeju island, South Korea, International conference

  [Invited]

  Invited oral presentation


• Radiative Recombination Properties in InAs/GaAs Quantum Dot Solar Cells

  N. Kasamatsu, A. Hasegawa, T. Kita

  The 40th International Symposium on Compound Semiconductors, May 2013, English, Kobe, International conference

  Oral presentation


• Polarization Controlled Emisson from Closely Stacked InAs/GaAs Quantum Dots

  M. Suwa, A. Takahashi, T. Ueda, Y. Bessho, Y. Harada, T. Kita

  The 40th International Symposium on Compound Semiconductors, May 2013, English, Kobe, International conference

  Oral presentation


• Energy Relaxation of Photoexcited Electrons in Direct Si-Doped InAs/GaAs Quantum Dots

  R. Hasegawa, Y. Harada, T. Kita

  ISCS2013, May 2013, English, Kobe, International conference

  Oral presentation


• Effect of State Filling on Intraband Carrier Dynamics in InAs/GaAs quantum Dots

  Y. Harada, T. Maeda, T. Kita

  ISCS2013, May 2013, English, Kobe, International conference

  Oral presentation


• Anisoropic Intraband Relaxation in a Multistacked Quantum Dot Ensemble

  O. Kojima, H. Tanaka, T. Kita, K. Akahane

  ISCS2013, May 2013, English, Kobe, International conference

  Poster presentation


• 歪み補償多層積層量子ドットにおける光学利得の面内異方性

  Kojima Osamu, Tanaka Hideharu, Kita Takashi, Akahane Kouichi

  第60回応用物理学関係連合講演会, Mar. 2013, Japanese, 神奈川工科大学, Domestic conference

  Oral presentation


• 窒素を高濃度デルタドープしたGaAsの磁気光学特性

  HARADA YUKIHIRO, 山本 益輝, 馬場 健, KITA TAKASHI

  第60回応用物理学会春季学術講演会, Mar. 2013, Japanese, 神奈川工科大学, Domestic conference

  Oral presentation


• 斜め積層InAs/GaAs量子ドットの端面発光特性

  HARADA YUKIHIRO, 別所 侑亮, KITA TAKASHI, 田口 英次, 保田 英洋

  第60回応用物理学会春季学術講演会, Mar. 2013, Japanese, 神奈川工科大学, Domestic conference

  Oral presentation


• Si直接ドーピングInAs/GaAs量子ドットのキャリア緩和過程

  長谷川 隆一, HARADA YUKIHIRO, KITA TAKASHI

  第60回応用物理学会春季学術講演会, Mar. 2013, Japanese, 神奈川工科大学, Domestic conference

  Oral presentation


• Intensity modulation of optical pulse due to exciton quantum beat in a GaAs/AlAs multiple quantum well

  Kojima Osamu, Hayashii Ken, Kita Takashi, Akahane Kouichi

  日本物理学会第68回年次大会, Mar. 2013, Japanese, 広島大学, Domestic conference

  Oral presentation


• Intraband Carrier Dynamics in InAs/GaAs Quantum Dots Studied by Two-Color Excitation Spectroscopy

  H. Harada, T. Maeda, T. Kita

  SPIE Photonics West 2013, Feb. 2013, English, California, United States, International conference

  Oral presentation


• 窒素デルタドーピングによるGaAs電子状態の制御

  山本 益輝, HARADA YUKIHIRO, KITA TAKASHI

  第23回光物性研究会, Dec. 2012, Japanese, 大阪市立大学, Domestic conference

  Poster presentation


• Intermediate-Band Solar Cells using InGaAs/InP Superlattices

  Y. Harada, W. G. Hu, T. Kita

  4th International Workshop on Quantum Nanostructure Solar Cells/8th Seminar on Quantum Nanostructure Materials, Dec. 2012, English, Kobe Ubiversity, International conference

  [Invited]

  Invited oral presentation


• InAs/GaAs Quantum Dot Superlattices and Optical Responses

  T. Kita

  4th International Workshop on Quantum Nanostructure Solar Cells, 8th Seminar on Quantum Nanostructure Materials, Dec. 2012, English, Kobe, International conference

  [Invited]

  Invited oral presentation


• In0.53Ga0.47As/InP超格子における2段階光吸収を利用した中間バンド型太陽電池

  HARADA YUKIHIRO, 胡 衛国, KITA TAKASHI

  第23回光物性研究会, Dec. 2012, Japanese, 大阪市立大学, Domestic conference

  Poster presentation


• Control of energy transfer rate towards ultrafast response due to changing number ratio of energy donor-acceptor cyanine dye molecules

  Kojima Osamu, Fujii Ryoji, Kita Takashi

  Sixth International Meeting on Molecular Electronics, Dec. 2012, English, Grenoble, France, International conference

  Oral presentation


• 量子ドット光ｱﾝﾌﾟの利得スペクトル測定

  諏訪 雅也, 喜多 隆

  平成24年度第1回半導体エレクトロニクス部門委員会研究会, Sep. 2012, Japanese, 日本材料学会半導体ｴﾚｸﾄﾛﾆｸｽ部門委員会, 和歌山, Domestic conference

  Oral presentation


• 光共振器構造中のInAs/GaAs量子ドットにおけるサブバンド間遷移ダイナミクス

  HARADA YUKIHIRO, 前田 剛志, KITA TAKASHI

  日本物理学会2012年秋季大会, Sep. 2012, Japanese, 横浜国立大学, Domestic conference

  Oral presentation


• 光共振器構造中のInAs/GaAs量子ドットにおける2段階光吸収の増強

  HARADA YUKIHIRO, 前田 剛志, KITA TAKASHI

  第73回応用物理学会学術講演会, Sep. 2012, Japanese, 愛媛大学・松山大学, Domestic conference

  Oral presentation


• SiダイレクトドーピングによるInAs量子ドットのフェルミ準位の変化

  長谷川 隆一, 井上 知也, HARADA YUKIHIRO, KITA TAKASHI

  第73回応用物理学会学術講演会, Sep. 2012, Japanese, 愛媛大学・松山大学, Domestic conference

  Oral presentation


• Miniband Formation in Closely-Stacked InAs GaAs Quantum Dots

  A Tahahashi, Y Ikeuchi, T Ueda, Y Harada, T Kita

  The17th International Conference on Molecular Beam Epitaxy, Sep. 2012, English, MBE, Nara, International conference

  Oral presentation


• InフラックスによるInAs/GaAs量子ドットの積層方向の制御

  別所 侑亮, HARADA YUKIHIRO, KITA TAKASHI, 田口 英次, 保田 英洋

  第73回応用物理学会学術講演会, Sep. 2012, Japanese, 愛媛大学・松山大学, Domestic conference

  Oral presentation


• InAs供給量を制御した近接積層InAs/GaAs量子ドットの発光特性

  高橋 章浩, 池内 佑一郎, 小西 康太, 上田 竜也, HARADA YUKIHIRO, KITA TAKASHI

  第73回応用物理学会学術講演会, Sep. 2012, Japanese, 愛媛大学・松山大学, Domestic conference

  Oral presentation


• Effects of Excess Electrons on Recombination Lifetime in Directly Si-doped InAs GaAs Quantum Dots

  R Hasegawa, T Inoue, Y Harada, O Kojima, T Kita

  The17th International Conference on Molecular Beam Epitaxy, Sep. 2012, English, MBE, Nara, International conference

  Oral presentation


• Effect of fifth nonlinear polarization on exciton Rabi oscillation in GaAs/AlxGa1-xAs double heterostructure thin films

  Kojima Osamu, Goi Keita, Kita Takashi, Isu Toshiro

  European Optical Society Annual Meeting 2012, Sep. 2012, English, Aberdeen, UK, International conference

  Oral presentation


• Control of Stacking Direction of InAs GaAs Quantum Dots

  Y Bessho, Y Harada, T Kita, E Taguchi, H Yasuda

  The17th International Conference on Molecular Beam Epitaxy, Sep. 2012, English, MBE, Nara, International conference

  Oral presentation


• Control of response of exciton polariton confined in GaAs thin films by controlling pump and probe pulses

  Kojima Osamu, Ohta Shohei, Kita Takashi, Isu Toshiro

  Photon12 IOP's premier conference in optics and photonics, Sep. 2012, English, Durham, UK, International conference

  Poster presentation


• Control of Electronic Structure of GaAs Using Nitrogen δ-doping Technique

  M Yamamoto, K Kimura, Y Harada, T Kita

  The17th International Conference on Molecular Beam Epitaxy, Sep. 2012, English, MBE, Nara, International conference

  Oral presentation


• Carrier Dynamics of Electrons in Intermediate States of InAs/GaAs Quantum Dots

  T. Kita

  High-efficiency materials for photovoltaics, Sep. 2012, English, London, UK, International conference

  [Invited]

  Invited oral presentation


• GaAs中の配列制御された窒素ペアに束縛された励起子の光物性

  HARADA YUKIHIRO, KITA TAKASHI

  第2回光科学異分野横断萌芽研究会, Aug. 2012, Japanese, 岡崎コンファレンスセンター, Domestic conference

  Oral presentation


• Ultrafast photonic Mach-Zehnder switch using quantum dot vertical cavity structures

  Wada Osamu, Hopkinson Mark, Jin Chaoyuan, Kojima Osamu, Oulton Rupert, Gennaro Sylvain, Akahane Kouichi, Kita Takashi, Hogg Richard

  UK Semiconductors, Jul. 2012, English, Sheffield, UK, International conference

  Oral presentation


• Tuning Optical and Ferromagnetic Properties of GdN Thin Films by Nitrogen-Vacancy Centers

  R Vidyasagar, S Kitayama, H Yoshitomi, T Kita, T Sakurai, H Ohta

  The 10th International Conference on Excitonic Processes in Condensed Mattsr, Nanostructured and Molecular Materials, Jul. 2012, English, EXCON, Groningen, Netherlands, International conference

  Oral presentation


• Strong Electron-Hole Correlation in Bound Exciton in Nitrogen δ-Doped GaAs

  Y Harada, T Kubo, T Inoue, O Kojima, T Kita

  The 10th International Conference on Excitonic Processes in Condensed Mattsr, Nanostructured and Molecular Materials, Jul. 2012, English, EXCON, Groningen, Netherlands, International conference

  Oral presentation


• Physical Properties of Amorphous In-Ga-Zn-O Films Deposited Under Various Sputtering Pressure

  S Yasuno, T Kita, S Morita, A Hino, K Hayashi, T Kugimiya

  The Nineteenth International Workshop on Active-Matrix Flatpanel Displays and Devices, Jul. 2012, English, JSAP, Kyoto, International conference

  Oral presentation


• Intraband Optical Response in InAsGaAs Quantum Dots

  T Maeda, Y Harada, T Kita

  The 10th International Conference on Excitonic Processes in Condensed Mattsr, Nanostructured and Molecular Materials, Jul. 2012, English, Groningen, Netherlands, International conference

  Oral presentation


• Excitation Effects of Confined Exciton Polariton on Pulse Shape Propagating in GaAs Thin Films

  O Kojima, S Ohta, T Kita, T Isu

  The 10th International Conference on Excitonic Processes in Condensed Mattsr, Nanostructured and Molecular Materials, Jul. 2012, English, EXCON, Groningen, Netherlands, International conference

  Oral presentation


• Evaluation of Minority and Majority Spin Band Energies of Ferromagnetic GdN Thin Films Using Optical Absorption Spectroscopy

  R Vidyasagar, S Kitayama, H Yoshitomi, T Kita, T Sakurai, H Ohta

  31st International Conference on the Physics of Semiconductors, Jul. 2012, English, ICPS, Zurich, Switzerland, International conference

  Oral presentation


• Determination of Magnetic Anisotropies in GdN Thin Film by Ferromagnetic Resonance

  Fatma. Elmasry, Wei-Min. Zhang, H. Ohta, Y. Fukuoka, S. Okubo, M. Fujisawa, H. Yoshitomi, S Kitayama, T Kita, O Wada, T Sakurai

  31nd International Conference on the Physics of Semiconductors, Jul. 2012, English, ETH, Zurich, Switzerland, International conference

  Oral presentation


• Delocalization of Exciton States in InAs GaAs Quantum Dot Superlattices

  Y Ikeuchi, A Takahashi, T Kita

  31nd International Conference on the Physics of Semiconductors, Jul. 2012, English, ETH, Zurich, Swiss, International conference

  Oral presentation


• Delocalization of electronic states formed by nitrogen pairs in GaAs

  M. Yamamoto, K. Kimura, Y. Harada, T. Kita

  31st Electronic Materials Symposium, Jul. 2012, Japanese, ラフォーレ修善寺, Domestic conference

  Poster presentation


• High-Resolution Optical Coherence Tomography Using Broadband Light Sources with Strain-Controlled InAs GaAs Quantum Dots

  I Tsubaki, T Kita

  International Conference on Optical, Optoelectronic and Photonic Materials and Applications, Jun. 2012, English, ICOOPMA, Nara, International conference

  Oral presentation


• Extremely Uniform Excitonic States in Nitrogen δ-Doped GaAs

  Y Harada, T Kita

  International Conference on Optical, Optoelectronic and Photonic Materials and Applications, Jun. 2012, English, ICOOPMA, Nara, International conference

  [Invited]

  Invited oral presentation


• Carrier Dynamics in Multiple Stacked Quantum Dots Under Spacer Layer Excitation Conditions

  J Tasaki, O Kojima, T Kita, K Akahane

  International Conference on Optical, Optoelectronic and Photonic Materials and Applications, Jun. 2012, English, ICOOPMA, Nara, International conference

  Oral presentation


• Carrier Dynamics in Intermediate States of InAs/GaAs Quantum Dots Embedded in Photonic Cavity Structure

  T Kita, T Maeda, Y Harada

  38th IEEE Photovoltaic Specialist Conference, Jun. 2012, English, IEEE, Austin, United States of America, International conference

  [Invited]

  Invited oral presentation


• Analysis of Spin Splitting in Ferromagnetic GdN Epitaxial Thin Films

  R. Vidyasagar, S Kitayama, H Yoshitomi, T Kita

  2012 MRS Spring Meeting and Exhibit,, Apr. 2012, English, Materials Research Society, SanFrancisco, United States of America, International conference

  Oral presentation


• 歪み補償多層積層量子ドットにおける非共鳴励起キャリアダイナミクス

  TASAKIJunya, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  日本物理学会第67回年次大会, Mar. 2012, Japanese, 日本物理学会, 西宮市, Domestic conference

  Poster presentation


• 窒素をデルタドープしたGaAsにおける束縛励起子発光線幅の温度依存性

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  第59回応用物理学関係連合講演会, Mar. 2012, Japanese, 日本応用物理学会, 東京都, Domestic conference

  Oral presentation


• 近接積層InAs/GaAs量子ドットの光物性

  高橋 章浩, 池内 佑一郎, 小西 康太, 別所 侑亮, 原田 幸弘, 喜多 隆, 田口 英次, 保田 英洋

  第59回応用物理学関係連合講演会, Mar. 2012, Japanese, 応用物理学会, 新宿区, Domestic conference

  Oral presentation


• GaAsエピタキシャル界面への窒素のデルタドーピングと高均一発光特性

  喜多 隆, 原田 幸弘

  第59回応用物理学関係連合講演会, Mar. 2012, Japanese, 応用物理学会, 新宿区, Domestic conference

  Invited oral presentation


• 半導体中の励起子非線形光学応答のコヒーレント制御

  KOJIMA Osamu, YAMASHITA Takae, KITA Takashi, AKAHANE Kouichi

  第22回光物性研究会, Dec. 2011, Japanese, 光物性研究会組織委員, 熊本市, Domestic conference

  Poster presentation


• 積層InAs量子ドットにおける光学利得の異方性

  TANAKA Hideharu, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  第22回光物性研究会, Dec. 2011, Japanese, 光物性研究会組織委員, 熊本市, Domestic conference

  Poster presentation


• Switching characteristics of exciton response in GaAs thin films

  OHTA Shohei, Kojima Osamu, Kita Takashi, ISU Toshiro

  Workshop on Innovation and Pioneering Technology 2011, Dec. 2011, English, WINPTech組織委員会, 神戸市, International conference

  Poster presentation


• Suppression of Nonradiative Recombination Process in Directly Si-Doped InAs Quantum Dots

  R Hasegawa, T Inoue, T Tanaka, H Harada, O Kojima, T Kita

  21st International Photovoltaic Science ａｎｄ Engineering Conference PVSECPVSEC-21, Dec. 2011, English, Fukuoka, International conference

  Poster presentation


• GaAs薄膜における励起子応答の光スイッチング特性

  OOTA Shohei, KOJIMA Osamu, KITA Takashi, ISU Toshiro

  第22回光物性研究会, Dec. 2011, Japanese, 光物性研究会組織委員, 熊本市, Domestic conference

  Poster presentation


• GaAs中の窒素ペアに束縛された励起子における励起子-格子相互作用

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  第22回光物性研究会, Dec. 2011, Japanese, 光物性研究会組織委員, 熊本市, Domestic conference

  Poster presentation


• GaAs/AlAs超格子における励起子超高速応答

  KOJIMA Osamu, YAMASHITA Takae, KITA Takashi, AKAHANE Kouichi

  第22回光物性研究会, Dec. 2011, Japanese, 光物性研究会組織委員, 熊本市, Domestic conference

  Poster presentation


• Effects of fifth-order nonlinear polarization on optical control of excitonic states confined in GaAs thin films by using Rabi oscillation

  GOI Keita, Kojima Osamu, Kita Takashi, ISU Toshiro

  Workshop on Innovation and Pioneering Technology 2011, Dec. 2011, English, WINPTech組織委員会, 神戸市, International conference

  Poster presentation


• Effects of Argon Plasma Irradiation on Amorphous In-Ga-Zu-Ofilm Evaluated by Microwave Photoconductivity Decay Method

  S Yasuno, T Kita, S Morita, K Hayashi, T Kugimiya, S Sumie

  The 18th International Display Workshops, Dec. 2011, English, Nagoya, International conference

  [Invited]

  Invited oral presentation


• Effect of Spacer Layer Thickness on Optical Properties of Multi-Stacked InGaAs Quantum Dot Grown on GaAs(311)B Substrate

  Y Shoji, K Narahara, H Tanaka, T Kita, K Akimoto, Y Okada

  21st International Photovoltaic Science ａｎｄ Engineering Conference PVSECPVSEC-21, Dec. 2011, English, Fukuoka, International conference

  Oral presentation


• Effect of control of number ratio of energy donor-acceptor cyanine dye molecules in thin films on Förster energy transfer

  FUJII Ryoji, KOJIMA Osamu, KITA Takashi

  Workshop on Innovation and Pioneering Technology 2011, Dec. 2011, English, WINPTech組織委員会, 神戸市, International conference

  Poster presentation


• Optical Properties of Quantum Dot Superlattices

  T Kita, O Kojima, Y Harada

  8th International Conference on Flow Dynamics, Nov. 2011, English, ICFD organizing committee, 仙台市, International conference

  Poster presentation


• Magneto-Optical Effect in GaN Epitaxial Thin Films

  R Vidya Sagar, H Yoshitomi, S Kitayama, T Kita, H Ohta, T Sakurai

  15th International Conference on Thin Films,2011, Nov. 2011, English, Kyoto, International conference

  Oral presentation


• Effects of Absorption Balance in Intermediate Band Quantum Dots Solar Cells

  A Hasegawa, W Hu, T Kita

  21st International Photovoltaic Science ａｎｄ Engineering Conference PVSECPVSEC-21, Nov. 2011, English, Fukuoka, International conference

  Poster presentation


• Correlation Between Local Atomic Structure and Ultra Violet Luminescence of AlGdN Thin Films

  K Ichii, S Kitayama, S Iwahashi, J Nakamura, R Vidya Sagar, T Kita, Y Chigi, T Nishimoto, H Tanaka, M Kobayashi, T Ishihara, H Izumi

  15th International Conference on Thin Films,2011, Nov. 2011, English, Kyoto, International conference

  Oral presentation


• 光共振器を有する中間バンド型太陽電池の光吸収増強効果

  前田 剛志, 小島 磨, 原田 幸弘, 喜多 隆

  平成23年度第1回半導体エレクトロニクス部門委員会研究会, Oct. 2011, Japanese, 材料学会半導体エレクトロニクス部門委員会, 神戸市, Domestic conference

  Oral presentation


• 近接積層量子ドット成長を利用した偏波無依存光応答の実現

  小西 康太, 池内 佑一郎, 原田 幸弘, 喜多 隆, 田口 栄次, 保田 英洋

  平成23年度第1回半導体エレクトロニクス部門委員会研究会, Oct. 2011, Japanese, 材料学会半導体エレクトロニクス部門委員会, 神戸市, Domestic conference

  Oral presentation


• 歪み補償多層積層量子ドットにおける非共鳴励起緩和過程

  TASAKIJunya, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  日本物理学会2011年秋季大会, Sep. 2011, Japanese, 日本物理学会, 富山市, Domestic conference

  Poster presentation


• 不純物制御したInAs量子ドットにおける発光再結合ダイナミックス

  田中 秀治, 小島 磨, 喜多 隆, 赤羽 浩一

  第72回応用物理学会学術講演会, Sep. 2011, Japanese, 応用物理学会, 山形市, Domestic conference

  Oral presentation


• 窒素をデルタドープしたGaAsにおける束縛励起子発光線の起源

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  第72回応用物理学会学術講演会, Sep. 2011, Japanese, 日本応用物理学会, 山形市, Domestic conference

  Oral presentation


• 多層積層高密度量子ドットにおける光学利得

  TANAKA Hideharu, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  第72回応用物理学会学術講演会, Sep. 2011, Japanese, 日本応用物理学会, 山形市, Domestic conference

  Oral presentation


• 近接積層に伴う量子ドットのフォトルミネッセンス偏光特性

  池内 佑一郎, 麻田 将貴, 井上 知也, 原田 幸弘, 喜多 隆, 田口 栄次, 保田 英洋

  第72回応用物理学会学術講演会, Sep. 2011, Japanese, 応用物理学会, 山形市, Domestic conference

  Oral presentation


• Photoluminescence Polarization Anisotropy in Closely Stacked InAs/GaAs Quantum Dots

  T Kita, T Inoue, Y Harada

  Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures, Sep. 2011, English, Austria, International conference

  Oral presentation


• Photoluminescence Dynamics of Spacer Layer Carriers in Multi Stacked Quantum Dots

  O Kojima, T Kita, K Akahane

  12th International Conference on Optics of Excitons in Confined Systems, Sep. 2011, English, OECS組織委員会, Paris, International conference

  Poster presentation


• Layer-by-Layer法による交互吸着シアニン色素薄膜の作製

  FUJII Ryouji, KOJIMA Osamu, KITA Takashi

  第72回応用物理学会学術講演会, Sep. 2011, Japanese, 日本応用物理学会, 山形市, Domestic conference

  Oral presentation


• Interaction of quantized exciton polaritons with nonresonant pump pulse in GaAs thin flims

  OHTA Shohei, Kojima Osamu, Kita Takashi, ISU Toshiro

  12th International Conference on Optics of Excitons in Confined Systems, Sep. 2011, English, OECS組織委員会, Paris, France, International conference

  Poster presentation


• GaAs薄膜中の光電場に対する局所場の効果

  KOJIMA Osamu, YAMASHITA Takae, KITA Takashi, ISU Toshiro

  第72回応用物理学会学術講演会, Sep. 2011, Japanese, 日本応用物理学会, 山形市, Domestic conference

  Poster presentation


• GaAs薄膜における励起子状態の光制御に対する入射光エネルギー依存性

  GOI Keita, KOJIMA Osamu, YAMASHITA Takae, KITA Takashi, ISU Toshiro

  日本物理学会2011年秋季大会, Sep. 2011, Japanese, 日本物理学会, 富山市, Domestic conference

  Oral presentation


• GaAs中の窒素ペアに束縛された励起子分子の磁気光学特性

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  日本物理学会2011年秋季大会, Sep. 2011, Japanese, 日本物理学会, 富山市, Domestic conference

  Poster presentation


• GaAs中の窒素ペアに束縛された励起子のフォノンサイドバンド発光

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  第72回応用物理学会学術講演会, Sep. 2011, Japanese, 日本応用物理学会, 山形市, Domestic conference

  Oral presentation


• GaAs nipi超格子におけるコヒーレントプラズモン振動のドーピング濃度依存性

  KOJIMA Osamu, SAKAMOTO Tsukuru, INOUE Tomoya, KITA Takashi

  日本物理学会2011年秋季大会, Sep. 2011, Japanese, 日本物理学会, 富山市, Domestic conference

  Poster presentation


• Effect of Capping Layer Growth on Bound Exciton Luminescence in Nitrogen δ-Doped GaAs

  Y Harada, T Kubo, T Inoue, O Kojima, T Kita

  2011 International Conference on Solid State Devices and Materials, Sep. 2011, English, SSDN組織委員会, Aichi, International conference

  Poster presentation


• Carrier Dynamics in Quantum Dot Superlattices

  O Kojima, T Kita, K Akahane

  High-Efficiency Materials for Photovoltaics, Imperial College London, Aug. 2011, English, London, International conference

  [Invited]

  Invited oral presentation


• Two-Photons Transition in Intermediate Band Solar Cells

  W G Hu, Y Harada, T Inoue, O Kojima, T Kita

  37th IEEE Photovoltaic Specialist Conference, Jul. 2011, English, Seattle, International conference

  Oral presentation


• In-plane optical anisotropy in stacked InAs quantum dots with interconnected electron states

  TANAKA Hideharu, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  第30回電子材料シンポジウム, Jul. 2011, Japanese, EMS組織委員, 大津市, Domestic conference

  Poster presentation


• Electronic states in multiply stacked InAs/GaAs quantum dots studied by polarized photoluminescence spectroscopy

  IKEUCHI Yuichiro, ASADA Masaki, INOUE Tomoya, HARADA Yukihiro, KOJIMA Osamu, KITA Takashi

  第30回電子材料シンポジウム, Jul. 2011, Japanese, EMS組織委員, 大津市, Domestic conference

  Poster presentation


• Capping layer dependence of bound exciton luminescence in nitrogen delta-doped GaAs

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  第30回電子材料シンポジウム, Jul. 2011, Japanese, EMS組織委員, 大津市, Domestic conference

  Poster presentation


• Optical Phase Shifter Using Quantum Dots in a Vertical Cavity

  C Y Jin, O Kojima, T Kita, O Wada, M Hopkinson

  23rd International Conference on Indium Phosphide and Related Materials, May 2011, English, Germany, International conference

  Oral presentation


• Near-Field Photoluminescence Spectroscopy of CdTe/Cd0.75Mn0.25Te Tilted Superlattices

  Y Harada, T Kita, K Matsuda, Y Kanemitsu, H Mariette

  38th International Symposium on Compound Semiconductors, May 2011, English, ISCS組織委員会, Germany, International conference

  Poster presentation


• Diamagnetic shift of exciton bound to the nitrogen pairs in GaAs

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  38th International Symposium on Compound Semiconductors, May 2011, English, ISCS組織委員会, Berling, Germany, International conference

  Oral presentation


• Ultraviolet Light Emitting Devices Using AlGdN

  T Kita

  2011 MRS Spring Meeting and Exhibit, Apr. 2011, English, SanFrancisco, International conference

  [Invited]

  Invited oral presentation


• 非共鳴励起下における励起子ポラリトンと光電場の結合

  OOTA Shohei, KOJIMA Osamu, KITA Takashi, ISU Toshiro

  第71回応用物理学会学術講演会, Mar. 2011, Japanese, 日本応用物理学会, 長崎市, Domestic conference

  Oral presentation


• 窒素をデルタドープしたGaAsにおける束縛励起子発光線のキャップ層成長条件依存性

  原田 幸弘, 久保 輝宜, 井上 知也, 小島 磨, 喜多 隆

  第60回応用物理学関係連合講演会, Mar. 2011, Japanese, 応用物理学会, 厚木市, Domestic conference

  Oral presentation


• 窒素をデルタドープしたGaAsにおける束縛励起子発光線のキャップ層成長条件依存性

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  第58回応用物理学関係連合講演会, Mar. 2011, Japanese, 日本応用物理学会, 厚木市, Domestic conference

  Oral presentation


• 多層積層量子ドット励起子とスペーサー層キャリアとの相関

  KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  日本物理学会第66回年次大会, Mar. 2011, Japanese, 日本物理学会, 新潟市, Domestic conference

  Oral presentation


• 多層積層量子ドットにおける偏光特性の励起光強度依存性

  TANAKA Hideharu, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  第58回応用物理学関係連合講演会, Mar. 2011, Japanese, 日本応用物理学会, 厚木市, Domestic conference

  Oral presentation


• 重心運動閉じ込め励起子の量子ビートの生成と検出

  OOTA Shohei, KOJIMA Osamu, KITA Takashi, ISU Toshiro

  第58回応用物理学関係連合講演会, Mar. 2011, Japanese, 日本応用物理学会, 厚木市, Domestic conference

  Oral presentation


• 近接多層積層量子ドットのフォトルミネッセンス偏光特性

  池内 佑一郎, 麻田 将貴, 井上 知也, 原田 幸弘, 小島 磨, 喜多 隆

  第58回応用物理学関係連合講演会, Mar. 2011, Japanese, 応用物理学会, 厚木市, Domestic conference

  Oral presentation


• シアニン色素薄膜におけるエネルギー移動の飽和のメカニズム

  FUJII Ryouji, KOJIMA Osamu, KITA Takashi

  第58回応用物理学関係連合講演会, Mar. 2011, Japanese, 日本応用物理学会, 厚木市, Domestic conference

  Oral presentation


• GaAs 薄膜における励起子状態制御に対する空間電場コヒーレンス

  GOI Keita, KOJIMA Osamu, YAMASHITA Takae, KITA Takashi, AKAHANE Kouichi

  日本物理学会第66回年次大会, Mar. 2011, Japanese, 日本物理学会, 新潟市, Domestic conference

  Poster presentation


• GaAs中の窒素ペアに束縛された励起子の輻射再結合寿命

  原田 幸弘, 久保 輝宜, 井上 知也, 小島 磨, 喜多 隆

  「ナノ構造・物性」第3回研究会, Mar. 2011, Japanese, 神戸大学自然科学系融合研究環ナノエンジニアリング研究チーム, ナノ学会ナノ構造・物性部会, 神戸市, Domestic conference

  Oral presentation


• GaAs 中の窒素ペアに束縛された励起子の磁気光学特性

  原田 幸弘, 久保 輝宜, 井上 知也, 小島 磨, 喜多 隆

  第59回応用物理学関係連合講演会, Mar. 2011, Japanese, 応用物理学会, 厚木市, Domestic conference

  Oral presentation


• GaAs中の窒素ペアに束縛された励起子の磁気光学特性

  Harada Yukihiro, KUBO Terutada, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  第58回応用物理学関係連合講演会, Mar. 2011, Japanese, 日本応用物理学会, 厚木市, Domestic conference

  Oral presentation


• GaAs/AlAs超格子における励起子非線形光学特性に対するミニバンド形成の効果

  YAMASHITA Takae, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  日本物理学会第66回年次大会, Mar. 2011, Japanese, 日本物理学会, 新潟市, Domestic conference

  Poster presentation


• 自己形成量子ドット成長過程のその場観察と新規光デバイスの作製

  喜多 隆, 井上 知也

  日本表面科学会第67回表面科学研究会＜In-situモニタリングの視点からみた表面制御・評価技術～現状と課題～, Feb. 2011, Japanese, 東京都, Domestic conference

  [Invited]

  Invited oral presentation


• 歪み補償積層量子ドットの光学異方性

  TANAKA Hideharu, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  第21回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員, 大阪市, Domestic conference

  Poster presentation


• 変調ドープGaAsにおけるコヒーレントプラズモンのドーピング濃度依存性

  SAKAMOTO Tsukuru, KOJIMA Osamu, INOUE Tomoya, KITA Takashi

  第21回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員, 大阪市, Domestic conference

  Poster presentation


• 窒素をデルタドープしたGaAsにおける励起子微細構造の反磁性シフト

  Harada Yukihiro, KUBO Terutada, KOJIMA Osamu, KITA Takashi

  第21回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員, 大阪市, Domestic conference

  Poster presentation


• 積層超高密度量子ドットにおけるキャリアダイナミクス

  KOJIMA Osamu, TOBITA Naoki, KITA Takashi, AKAHANE Kouichi

  第21回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員, 大阪市, Domestic conference

  Poster presentation


• 検出パルス制御によるGaAs薄膜中の閉じ込め励起子の超高速応答

  OOTA Shohei, KOJIMA Osamu, KITA Takashi, ISU Toshiro

  第21回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員, 大阪市, Domestic conference

  Poster presentation


• 希土類化合物半導体GdNにおけるバンド端光吸収の磁気光学特性

  吉富 大明, 來山 真也, 喜多 隆, 藤澤 真士, 太田 仁

  第21回光物性研究会, Dec. 2010, Japanese, 大阪市, Domestic conference

  Oral presentation


• シアニン色素薄膜におけるエネルギー移動に対するドナー‐アクセプタ分子数比の効果

  FUJII Ryouji, KOJIMA Osamu, KITA Takashi

  第21回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員, 大阪市, Domestic conference

  Poster presentation


• GaSb/AlGaSb多重量子井戸構造における発光特性

  KASHIMA Shoichi, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  第21回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員, 大阪市, Domestic conference

  Poster presentation


• GaAs薄膜における閉じ込め励起子状態の光制御

  GOI Keita, KOJIMA Osamu, YAMASHITA Takae, KITA Takashi, AKAHANE Kouichi

  第21回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員, 大阪市, Domestic conference

  Poster presentation


• GaAs中の窒素等電子トラップ束縛励起子の発光ダイナミクス

  久保 輝宜, 井上 知也, 原田 幸弘, 小島 磨, 喜多 隆

  第22回光物性研究会, Dec. 2010, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• Effect of spectral width of probe pulses on response of excitons confined in GaAs thin films

  Shohei Ota, Osamu Kojima, Takashi Kita, Toshiro Isu

  Workshop on Information, Nano and Photonics Technology 2010, Dec. 2010, English, WINPTECH組織委員会, 神戸市, International conference

  Poster presentation


• Biexcitonic contribution to nonlinear optical response of excitons in GaAs/AlAs superlattices

  Takae Yamashita, Osamu Kojima, Takashi Kita, Kouichi Akahane

  Workshop on Information, Nano and Photonics Technology 2010, Dec. 2010, English, WINPTECH組織委員会, 神戸市, International conference

  Poster presentation


• 量子ドットの多層積層化に伴う偏光異方性の発現と制御

  池内 佑一郎, 麻田 将貴, 井上 知也, 原田 幸弘, 小島 磨, 喜多 隆

  日本材料学会平成22年度第2回半導体エレクトロニクス部門研究会, Nov. 2010, Japanese, 日本材料学会, 堺市, Domestic conference

  Oral presentation


• 自己形成量子ドットの精密な成長制御と3次元構造化

  喜多 隆

  平成22年度東北大学電気通信研究所共同プロジェクト研究会, Nov. 2010, Japanese, 宮城県, Domestic conference

  [Invited]

  Invited oral presentation


• AIGdN結晶薄膜を利用したナローバンド深紫外発光デバイスの開発と基礎特性

  岸 直央, 來山 真也, 喜多 隆, 曲尾 章, 野口 徹, 千木 慶隆, 西本 哲郎, 田中 寛之, 小林 幹弘

  日本材料学会半導体エレクトロニクス研究部門平成22年度第2回研究会, Nov. 2010, Japanese, 大阪府, Domestic conference

  Oral presentation


• 量子ドット超格子によるキャリアダイナミックス制御

  喜多 隆

  第6回量子ナノ材料セミナー, Oct. 2010, Japanese, 茨城県, Domestic conference

  [Invited]

  Invited oral presentation


• In-Plane Polarization Anisotropy in Vertically Stacked InAs Quantum Dots

  IKEUCHI Yuichiro, ASADA Masaki, INOUE Tomoya, HARADA Yukihiro, KOJIMA Osamu, KITA Takashi

  The 6th International Workshop on Nano-scale Spectroscopy and Nanotechnology, Oct. 2010, English, NSS organizing committee, 神戸市, International conference

  Oral presentation


• 量子ドット太陽電池における吸収係数の理論的解析

  HU Weigo, INOUE Tomoya, KOJIMA Osamu, KITA Takashi

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 日本応用物理学会, 長崎市, Domestic conference

  Oral presentation


• 変調ドープGaAsにおける長寿命コヒーレントプラズモン

  SAKAMOTO Tsukuru, KOJIMA Osamu, INOUE Tomoya, KITA Takashi

  日本物理学会2010年秋季大会, Sep. 2010, Japanese, 日本物理学会, 堺市, Domestic conference

  Oral presentation


• 多層積層量子ドットにおける高次励起子準位励起効果

  KOJIMA Osamu, TOBITA Naoki, KITA Takashi, AKAHANE Kouichi

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 日本応用物理学会, 長崎市, Domestic conference

  Oral presentation


• 積層量子ドットにおける偏光特性に対する電子的結合効果

  TANAKA Hideharu, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 日本応用物理学会, 長崎市, Domestic conference

  Oral presentation


• 深紫外光源用Gd添加AIN薄膜の構造と発光強度の関係”

  小林 幹弘, 千木 慶隆, 西本 哲郎, 田中 寛之, 喜多 隆, 來山 真也, 石原 嗣生, 泉 宏和

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 長崎市, Domestic conference

  Oral presentation


• 高密度多層積層量子ドットにおけるキャリア移動

  KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  日本物理学会2010年秋季大会, Sep. 2010, Japanese, 日本物理学会, 堺市, Domestic conference

  Oral presentation


• 希土類窒化物半導体GdNの強磁性相転移に伴うバンド端構造変化

  吉富 大明, 來山 真也, 喜多 隆, 藤澤 真士, 太田 仁

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 長崎市, Domestic conference

  Oral presentation


• プラズマチューブアレイを用いたフィルム型水銀フリー深紫外光源

  郭濱 剛, 粟本 健司, 篠田 傳, 千木 慶隆, 西本 哲郎, 田中 寛之, 小林 幹弘, 石原 嗣生, 泉 宏和, 喜多 隆

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 長崎市, Domestic conference

  Oral presentation


• シアニン色素薄膜におけるエネルギー移動の高効率化

  FUJII Ryouji, KOJIMA Osamu, KITA Takashi

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 日本応用物理学会, 長崎市, Domestic conference

  Oral presentation


• Siを直接ドープしたInAs量子ドットにおける発光増強機構

  井上 知也, 笹山 憲吾, 喜多 隆

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 長崎市, Domestic conference

  Oral presentation


• Siダイレクトドーピングをした積層量子ドットの中間バンド型太陽電池への応用

  森岡 孝之, 大島 隆治, 高田 彩未, 庄司 靖, 井上 知也, 喜多 隆, 岡田 至崇

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 長崎市, Domestic conference

  Oral presentation


• III-V半導体中不純物制御と励起子物性

  原田 幸弘, 喜多 隆

  2010年秋季第71回応用物理学会学術講演会, Sep. 2010, Japanese, 応用物理学会, 長崎市, Domestic conference

  Invited oral presentation


• GaAs薄膜における閉じ込め励起子状態の制御性

  GOI Keita, KOJIMA Osamu, YAMASHITA Takae, KITA Takashi, AKAHANE Kouichi

  日本物理学会2010年秋季大会, Sep. 2010, Japanese, 日本物理学会, 堺市, Domestic conference

  Poster presentation


• GaAs薄膜におけるレーザースペクトル幅制御による励起子応答制御

  OOTA Shohei, KOJIMA Osamu, KITA Takashi, ISU Toshiro

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 日本応用物理学会, 長崎市, Domestic conference

  Oral presentation


• GaAsAlAs超格子における励起子非線形光学応答特性に対する励起子分子の寄与

  YAMASHITA Takae, KOJIMA Osamu, KITA Takashi, AKAHANE Kouichi

  日本物理学会2010年秋季大会, Sep. 2010, Japanese, 日本物理学会, 堺市, Domestic conference

  Oral presentation


• AINバッファー層導入による深紫外蛍光体AIGdNの発光強度向上

  來山 真也, 吉富 大明, 岩橋進 哉, 中村 順也, 喜多 隆, 千木 慶隆, 西本 哲郎, 田中寛 之, 小林 幹弘, 石原 嗣生, 泉 宏和

  第71回応用物理学会学術講演会, Sep. 2010, Japanese, 長崎市, Domestic conference

  Oral presentation


• Magneto-Photoluminescence Spectroscopy of Exciton Fine Structure in Nitrogen d-Doped GaAs

  HARADA Yukihiro, HORIUCHI Yoshiki, KOJIMA Osamu, KITA Takashi, WADA Osamu

  The 30th International Conference on the Physics of Semiconductors, Jul. 2010, English, ICPS organizing committee, Seoul, Korea, International conference

  Poster presentation


• Long-lived oscillation due to coherent plasmons in a modulation doped GaAs

  Tukuru Sakamoto, Osamu Kojima, Tomoya Inoue, Takashi Kita

  第29回電子材料シンポジウム, Jul. 2010, Japanese, EMS組織委員, 伊豆, Domestic conference

  Poster presentation


• Intraband relaxation process in highly stacked quantum dots

  Osamu Kojima, Masataka Mamizuka, Takashi Kita, Osamu Wada, Kouichi Akahane

  9th International Conference on, Jul. 2010, English, EXCON組織委員会, Brisbane, Australia, International conference

  Poster presentation


• Excitation power dependence of nonlinear optical response of excitons in GaAs/AlAs superlattices

  Takae Yamashita, Osamu Kojima, Takashi Kita, Osamu Wada, Kouichi Akahane

  9th International Conference on, Jul. 2010, English, EXCON組織委員会, Brisbane, Australia, International conference

  Poster presentation


• Bound Biexciton Luminescence in Nitrogen d-Doped GaAs

  HARADA Yukihiro, KOJIMA Osamu, KITA Takashi, WADA Osamu

  The 9th International Conference on Excitonic and Photonic Processes in Condensed and Nano Materials, Jul. 2010, English, EXCON organizing committee, Brisbane, Australia, International conference

  Poster presentation


• Multi-Stacked InAs/GaNAs Quantum dots with Direct Si Doping for use in Intermediate Band Solar Cell

  T Morioka, R Oshima, A Takata, Y Shoji, T Inoue, T Kita, Y Okada

  35th IEEE Photovoltaic Specialist Conference, Jun. 2010, English, Waikiki, Hawaii, International conference

  Oral presentation


• Intraband relaxation of photoexcited carriers in multiple stacked quantum dots and quantum dot chains

  Osamu Kojima, Masataka Mamizuka, Takashi Kita, Osamu Wada, Kouichi Akahane

  35th IEEE Photovoltaic Specialist Conference, Jun. 2010, English, PVSC組織委員会, Honolulu, USA, International conference

  Poster presentation


• Interaction between Conduction-Band Edge and Nitrogen-Related Localized Levels in Nitrogen d-Doped GaAs

  HARADA Yukihiro, KOJIMA Osamu, KITA Takashi, WADA Osamu

  The 37th International Symposium on Compound Semiconductors, Jun. 2010, English, 応用物理学会, 高松市, International conference

  Oral presentation


• Interaction between conduction-band edge and Nitrogen-related localized levels in Nitrogen d-doped GaAs

  Yukihiro Harada, Osamu Kojima, Takashi Kita, Osamu Wada

  37th International Symposium on Compound Semiconductors, Jun. 2010, English, ISCS組織委員会, 高松市, International conference

  Oral presentation


• Energy band structure design for quantum-dot, intermediate-band solar cells

  Weigo Hu, Tomoya Inoue, Takashi Kita, Osamu Kojima, Osamu Wada

  35th IEEE Photovoltaic Specialist Conference, Jun. 2010, English, PVSC組織委員会, Honolulu, USA, International conference

  Poster presentation


• All-optical switch using InAs quantum dots in a vertical cavity

  Chaoyuan Jin, Osamu Kojima, Tomoya Inoue, Shohei Ohta, Takashi Kita, Osamu Wada, Mark Hopkinson, Kouichi Akahane

  22nd International Conference on Indium Phosphide and Related Materials, Jun. 2010, English, IPRM組織委員会, 高松市, International conference

  Oral presentation


• Propagation Velocity of Excitonic Polaritons Confined in GaAs Thin Films

  O Kojima, S Watanabe, T Kita, O Wada, T Isu

  22rd International Conference on Indium Phoshide and Related Materials, May 2010, English, ISCS組織委員会, Kagawa, International conference

  Oral presentation


• Optical and Ferromagnetic Properties of GdN Thin Films

  H Yoshitomi, S Kitayama, T Kita, O Wada, M Fujisawa, H Ohta, T Sakurai

  22rd International Conference on Indium Phoshide and Related Materials, May 2010, English, Kagawa, International conference

  Oral presentation


• Energy band structure and half-filled condition in the quantum-dots intermediate band solar cells

  Weigo Hu, Tomoya Inoue, Takashi Kita, Osamu Kojima, Osamu Wada

  37th International Symposium on Compound Semiconductors, May 2010, English, ISCS組織委員会, 高松市, International conference

  Oral presentation


• Emission properties of excitons strongly localized to nitrogen pairs in GaAs

  HARADA Yukihiro, KITA Takashi

  The International Conference on Nanophotonics 2010, May 2010, English, ICNP organizing committee, つくば市, International conference

  [Invited]

  Invited oral presentation


• Control of Polarization Properties of Electroluminescence from Vertically-Stacked InAs/GaAs Quantum Dots for 1.3 μm-band Semiconductor Optical Amplifiers

  T Inoue, M Asada, N Yasuoka, T Kita, O Wada

  22rd International Conference on Indium Phoshide and Related Materials, May 2010, English, Kagawa, International conference

  Oral presentation


• Broadband Light Source Using InAs Quantum Dots With InGaAs Strain-Reducing Layers

  M tsuda, T Inoue, T Kita, O Wada

  22rd International Conference on Indium Phoshide and Related Materials, May 2010, English, Kagawa, International conference

  Oral presentation


• Direct Impurity Doping into InAs Quantum dots by Utilizing self-assembling Growth Steps

  K Sasayama, T Inoue, O Kojima, T Kita, O Wada

  Quantum Dot 2010, Apr. 2010, English, Nottingham, International conference

  Oral presentation


• 中間バンド型量子ドット太陽電池のエネルギー変換効率に及ぼすバンド構造の影響

  Hu Weigo, Inoue Tomoya, Takashi Kita, Osamu Kojima, Osamu Wada

  第57回応用物理学関係連合講演会, Mar. 2010, Japanese, 日本応用物理学会, 平塚市, Domestic conference

  Oral presentation


• 窒素をデルタドープしたGaAsにおける発光スペクトルの反磁性シフト

  Yukihiro Harada, Osamu Kojima, Takashi Kita, Osamu Wada

  日本物理学会第65回年次大会, Mar. 2010, Japanese, 日本物理学会, 岡山市, Domestic conference

  Poster presentation


• 窒素をデルタドープしたGaAs における電子状態の磁場依存性

  Yukihiro Harada, Osamu Kojima, Takashi Kita, Osamu Wada

  第57回応用物理学関係連合講演会, Mar. 2010, Japanese, 日本応用物理学会, 平塚市, Domestic conference

  Poster presentation


• 積層量子ドットにおける光励起キャリアの緩和ダイナミクス

  Mamizuka Masataka, Osamu Kojima, Takashi Kita, Osamu Wada, Akahane Kouichi

  第57回応用物理学関係連合講演会, Mar. 2010, Japanese, 日本応用物理学会, 平塚市, Domestic conference

  Poster presentation


• 垂直共振器型量子ドット全光スイッチにおける2 段階飽和

  C. Jin, Osamu Kojima, Inoue Tomoya, Ohta Shohei, Takashi Kita, Osamu Wada, Mark Hopkinson, Akahane Kouichi

  第57回応用物理学関係連合講演会, Mar. 2010, Japanese, 日本応用物理学会, 平塚市, Domestic conference

  Oral presentation


• 高密度多層積層量子ドットにおける励起子緩和ダイナミクス

  Osamu Kojima, Mamizuka Masataka, Takashi Kita, Osamu Wada, Akahane Kouichi

  日本物理学会第65回年次大会, Mar. 2010, Japanese, 日本物理学会, 岡山市, Domestic conference

  Oral presentation


• シアニン色素添加ポリマー薄膜におけるエネルギー移動特性の制御

  Shogo Hamano, Osamu Kojima, Takashi Kita, Osamu Wada

  第57回応用物理学関係連合講演会, Mar. 2010, Japanese, 日本応用物理学会, 平塚市, Domestic conference

  Oral presentation


• GaAsN 量子井戸からInAs 量子ドットへのキャリアトンネリング特性

  Ohta Shohei, C. Jin, Mark Hopkinson, Osamu Kojima, Takashi Kita, Osamu Wada

  第57回応用物理学関係連合講演会, Mar. 2010, Japanese, 日本応用物理学会, 平塚市, Domestic conference

  Poster presentation


• GaAs/AlAs超格子における励起子非線形応答の励起光強度依存性

  Yamashita Takae, Kojima Osamu, Kita Takashi, Wada Osamu, Kouichi Akahane

  日本物理学会第65回年次大会, Mar. 2010, Japanese, 日本物理学会, 岡山市, Domestic conference

  Poster presentation


• Vertically-Stacked InAs Quantum Dots for Polarization-Independent Semiconductor Optical Amplifiers

  T Inoue, M Asada, O Kojima, T Kita, O Wada

  SPIE Photonics West, Jan. 2010, English, San Francisco, International conference

  Oral presentation


• Vertically-stacked InAs quantum dots for polarization-independent semiconductor optical amplifiers

  Tomoya Inoue, Masaki Asada, Osamu Kojima, Takashi Kita, Osamu Wada

  Photonic West 2010, Jan. 2010, English, SPIE, San Francisco, International conference

  Poster presentation


• Vertical-Geometry All-Optical Switches Based on InAs/GaAs Quantum Dots in a Cavity

  C Y Jin, O Kojima, T Kita, O Wada, M Hopkinson, K Akahane

  SPIE Photonics West, Jan. 2010, English, San Francisco, International conference

  Oral presentation


• Vertical-geometry all-optical switches based on InAs/GaAs quantum dots in a cavi

  Chaoyuan Jin, Osamu Kojima, Takashi Kita, Osamu Wada, Mark Hopkinson, Kouichi Akahane

  Photonic West 2010, Jan. 2010, English, SPIE, San Francisco, International conference

  Poster presentation


• Exciton Fine Structures of Ordered Nitrogen Pairs in GaAs Fabricated by Using Reconstructed Surface

  T Kita

  Abst. Symposium on Surface and Nano Science 2010, Jan. 2010, English, Shizukuishi, International conference

  [Invited]

  Invited oral presentation


• 歪み補償積層InAs量子ドットにおける面内励起子移動のバンド内緩和過程への効果

  Mamizuka Masataka, Osamu Kojima, Takashi Kita, Osamu Wada, Akahane Kouichi

  第20回光物性研究会, Dec. 2009, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• シアニン色素添加ポリマー薄膜におけるエネルギー移動特性に対するスペクトル重なりの効果

  Shogo Hamano, Osamu Kojima, Takashi Kita, Osamu Wada

  第20回光物性研究会, Dec. 2009, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• Temperature dependent carrier tunneling in self-assembled InGaAs quantum dots with a dilute nitride quantum-well injector

  Shohei Ohta, Chaoyuan Jin, Mark Hopkinson, Osamu Kojima, Takashi Kita, Osamu Wada

  Workshop on Information, Nano and Photonics 2009, Dec. 2009, English, WINPTECH組織委員会, 神戸市, International conference

  Poster presentation


• Optical Nonlinearity of InAs Quantum Dots within a Vertical Cavity Structure for All-Optical Switching Devices

  C Y Jin, O Kojima, T Inoue, T Kita, O Wada, M Hopkinson, K Akahane

  Abstr. Workshop on Information, Nano, and Photonics Technology 2009, Dec. 2009, English, Kobe, International conference

  Oral presentation


• Optical nonlinearity of InAs quantum dots within a vertical cavity structure for all-optical switching devices

  Chaoyuan Jin, Osamu Kojima, Tomoya Inoue, Takashi Kita, Osamu Wada, Mark Hopkinson, Kouichi Akahane

  Workshop on Information, Nano and Photonics 2009, Dec. 2009, English, WINPTECH組織委員会, 神戸市, International conference

  Poster presentation


• GaAs薄膜における閉じ込め励起子の双極子モーメント

  Yamashita Takae, Osamu Kojima, Takashi Kita, Osamu Wada, Tosiro Isu

  第20回光物性研究会, Dec. 2009, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• GaAs中の窒素等電子束縛励起子における励起子ダイナミクス

  Yukihiro Harada, Osamu Kojima, Takashi Kita, Osamu Wada

  第20回光物性研究会, Dec. 2009, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• Energy band structure for intermediate band solar cells

  Weiguo Hu, Takashi Kita, Osamu Kojima, Osamu Wada

  Workshop on Information, Nano and Photonics 2009, Dec. 2009, English, WINPTECH組織委員会, 神戸市, International conference

  Poster presentation


• Energy band structure for intermediate band solar cells

  W Hu, T Kita, O Kojima, O Wada

  Abstr. Workshop on Information, Nano, and Photonics Technology 2009, Dec. 2009, English, Kobe, International conference

  Oral presentation


• Effects of in-plain exciton transfer on intraband relaxation process in stacked InAs quantum dots

  Masataka Mamizuka, Osamu Kojima, Takashi Kita, Osamu Wada, Kouichi Akahane

  Workshop on Information, Nano and Photonics 2009, Dec. 2009, English, WINPTECH組織委員会, 神戸市, International conference

  Poster presentation


• Effects of In-Plain Exciton Transfer on Intraband Relaxation Process in Stacked InAs Quantum Dots

  M Mamizuka, O Kojima, T Kita, O Wada, K Akahane

  Abstr. Workshop on Information, Nano, and Photonics Technology 2009, Dec. 2009, English, Kobe, International conference

  Oral presentation


• Effective dipole moments of excitons in GaAs thin films

  Takae Yamashita, Osamu Kojima, Takashi Kita, Osamu Wada, Toshiro Isu

  Workshop on Information, Nano and Photonics 2009, Dec. 2009, English, WINPTECH組織委員会, 神戸市, International conference

  Poster presentation


• Direct impurity doping into self-assembled InAs/GaAs quantum dots

  Kengo Sasayama, Tomoya Inoue, Osamu Kojima, Takashi Kita, Osamu Wada

  Workshop on Information, Nano and Photonics 2009, Dec. 2009, English, WINPTECH組織委員会, 神戸市, International conference

  Poster presentation


• Thermal effects on exciton dynamics in quantum dot chains

  Osamu Kojima, Hiroaki Nakatani, Takashi Kita, Osamu Wada, Kouichi Akahane

  International Symposium on Quantum Nanophotonics and Nanoelectronics, Nov. 2009, English, ISQNN組織委員会, 東京都, Domestic conference

  Oral presentation


• Narrowband Ultraviolet Light Emitting Devices Using Rare-Earth Ions

  T Kita

  International Symposium for Phosphor Materials 2009 (Phosphor Safari ), Nov. 2009, English, Niigata, International conference

  [Invited]

  Invited oral presentation


• 量子ドット埋め込み面型非対称共振器を用いた超高速全光スイッチ

  C. Jin, Osamu Kojima, Takashi Kita, Osamu Wada, Mark Hopkinson, Kouichi Akahane

  第70回応用物理学会学術講演会, Sep. 2009, Japanese, 応用物理学会, 富山市, Domestic conference

  Oral presentation


• 量子ドット埋め込み面型共振器光スイッチにおけるサブバンド間緩和の効果

  C. Jin, Osamu Kojima, Takashi Kita, Osamu Wada, Mark Hopkinson, Kouichi Akahane

  第70回応用物理学会学術講演会, Sep. 2009, Japanese, 応用物理学会, 富山市, Domestic conference

  Poster presentation


• 窒素をデルタドープしたGaAsにおける束縛励起子分子発光

  Yukihiro Harada, 堀内 義基, Osamu Kojima, Takashi Kita, Osamu Wada

  第70回応用物理学会学術講演会, Sep. 2009, Japanese, 応用物理学会, 富山市, Domestic conference

  Oral presentation


• シアニン色素薄膜におけるフェルスター型エネルギー移動による励起子緩和特性の制御

  Shogo Hamano, Osamu Kojima, Takashi Kita, Osamu Wada

  第70回応用物理学会学術講演会, Sep. 2009, Japanese, 応用物理学会, 富山市, Domestic conference

  Poster presentation


• SiダイレクトドーピングしたInAs量子ドットにおけるキャリア補償効果

  Sasayama Kengo, Inoue Tomoya, Takashi Kita, Osamu Kojima, Osamu Wada

  第70回応用物理学会学術講演会, Sep. 2009, Japanese, 応用物理学会, 富山市, Domestic conference

  Oral presentation


• InAs/GaAs量子ドットの積層構造による端面発光の偏波制御

  Inoue Tomoya, Asada Masaki, Osamu Kojima, Takashi Kita, Osamu Wada

  第70回応用物理学会学術講演会, Sep. 2009, Japanese, 応用物理学会, 富山市, Domestic conference

  Oral presentation


• GaAs薄膜の励起子非線形光学応答制御における第一パルス光強度依存性

  Yamashita Takae, Kojima Osamu, Kita Takashi, Wada Osamu, Isu Toshiro

  日本物理学会2009年秋季大会, Sep. 2009, Japanese, 日本物理学会, 熊本市, Domestic conference

  Poster presentation


• GaAs中の窒素等電子束縛励起子微細構造におけるポピュレーション

  Harada Yukihiro, Kojima Osamu, Kita Takashi, Wada Osamu

  日本物理学会2009年秋季大会, Sep. 2009, Japanese, 日本物理学会, 熊本市, Domestic conference

  Poster presentation


• GaAs/AlAs多重量子井戸における励起子非線形光学特性の制御

  Kojima Osamu, Yamashita Takae, Kita Takashi, Wada Osamu, Kouichi Akahane

  第70回応用物理学会学術講演会, Sep. 2009, Japanese, 応用物理学会, 富山市, Domestic conference

  Oral presentation


• GaAs/AlAs多重量子井戸における励起子非線形光学応答の増強

  Kojima Osamu, Yamashita Takae, Kita Takashi, Wada Osamu, Kouichi Akahane

  日本物理学会2009年秋季大会, Sep. 2009, Japanese, 日本物理学会, 熊本市, Domestic conference

  Oral presentation


• Exciton Polarization Splitting of Nitrogen Pairs in GaAs

  T Kita

  Abstr. SemiconNano2009, Aug. 2009, English, Anan, International conference

  [Invited]

  Invited oral presentation


• Enhancement of optical nonlinearity by spatially expanded excitons in GaAs/AlAs multiple quantum wells

  Osamu Kojima, Takashi Kita, Osamu Wada, Kouichi Akahane

  16th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures, Aug. 2009, English, EDISON組織委員会, Montpellier, International conference

  Oral presentation


• Spatial Coherence Effect on Transient Response of Confined Excitons in GaAs Thin Films

  O Kojima, S Watanebe, T Kita, O Wada, T Isu

  Abstr. 14th International Conference on Modulated Semiconductor Structures, Jul. 2009, English, Kobe, International conference

  Oral presentation


• Spatial coherence effect on transient response of confined excitons in GaAs thin films

  Osamu Kojima, Shingo Watanabe, Takashi Kita, Osamu Wada, Tosiro Isu

  14th International Conference on Modulated Semiconductor structures, Jul. 2009, English, MSS組織委員会, 神戸市, International conference

  Poster presentation


• Resonant Enhancement of Excitonic Photoluminescence via Biexciton Process in Stacked InAs Quantum Dots

  M Mamizuka, O Koji, T Kita, O Wada, K Akahane

  Abstr. 14th International Conference on Modulated Semiconductor Structures, Jul. 2009, English, Kobe, International conference

  Oral presentation


• Resonant enhancement of excitonic photoluminescence via biexciton process in stacked InAs quantum dots

  Masataka Mamizuka, Osamu Kojima, Takashi Kita, Osamu Wada, Kouichi Akahane

  14th International Conference on Modulated Semiconductor structures, Jul. 2009, English, MSS組織委員会, 神戸市, International conference

  Poster presentation


• Polarization controlled emission from stacked InAs quantum dots

  Tomoya Inoue, Nami Yasuoka, Osamu Kojima, Takashi Kita, Osamu Wada

  14th International Conference on Modulated Semiconductor structures, Jul. 2009, English, MSS組織委員会, 神戸市, International conference

  Poster presentation


• Polarization controlled emission from electronically coupled stacked InAs quantum dots

  T Inoue, N Yasuoka, O Kojima, T Kita, O Wada

  Abstr. 14th International Conference on Modulated Semiconductor Structures, Jul. 2009, English, Kobe, International conference

  Oral presentation


• Multiband optical absorption in stacked InAs quantum dots

  Masataka Mamizuka, Osamu Kojima, Takashi Kita, Osamu Wada, Kouichi Akahane

  第28回電子材料シンポジウム, Jul. 2009, Japanese, 電子材料シンポジウム運営委員会, 大津市, Domestic conference

  Poster presentation


• Magnetic-field control of the exciton fine polarization splitting of nitrogen pair centers in GaAs

  Yukihiro Harada, Tomoya Inoue, Osamu Kojima, Takashi Kita, Osamu Wada

  第28回電子材料シンポジウム, Jul. 2009, Japanese, 電子材料シンポジウム運営委員会, 大津市, Domestic conference

  Poster presentation


• Magnetic-field control of exciton fine structure splitting in nitrogen -doped GaAs

  Yukihiro Harada, Osamu Kojima, Takashi Kita, Osamu Wada

  14th International Conference on Modulated Semiconductor structures, Jul. 2009, English, MSS組織委員会, 神戸市, International conference

  Oral presentation


• Magnetic-Field Control of Exciton Fine Structure Splitting in Nitrogen Delta-Doped GaAs

  Y Harada, O Kojima, T Kita, O Wada

  Abstr. 14th International Conference on Modulated Semiconductor Structures, Jul. 2009, English, Kobe, International conference

  Oral presentation


• Field Emission Characteristics of Carbon Nanofiber Nanocomposites

  T Kita, N Kishi, Y Tanaka, M Kawamura, O Wada, H Yanagi, A Magario, T Noguchi

  Abstr. Internationa Symposium on Carbon Nanotube Nanoelectronics, Jul. 2009, English, Matsushima, International conference

  Oral presentation


• All-Optical Switching Using InAs GaAs Quantum Dots within a Vertical Cavity Structure

  C Y Jin, O Kojima, T Kita, O Wada, M Hopkinson, K Akahane

  Abstr. 14th International Conference on Modulated Semiconductor Structures, Jul. 2009, English, Kobe, International conference

  Oral presentation


• All-optical switching using InAs/GaAs quantum dots within a vertical cavity structu

  Chaoyuan Jin, Osamu Kojima, Takashi Kita, Osamu Wada, Mark Hopkinson, Kouichi Akahane

  14th International Conference on Modulated Semiconductor structures, Jul. 2009, English, MSS組織委員会, 神戸市, International conference

  Poster presentation


• 量子ドット埋め込み面型共振器構造を用いた超高速全光スイッチ

  C. Jin, Osamu Kojima, Yoshiyuki Tajima, Takashi Kita, Osamu Wada, Kouichi Akahane

  第56回応用物理学関係連合講演会, Mar. 2009, Japanese, 日本応用物理学会, つくば市, Domestic conference

  Oral presentation


• 窒素をデルタドープしたGaAs における等電子束縛励起子微細構造の磁場制御

  Yukihiro Harada, Osamu Kojima, Takashi Kita, Osamu Wada

  第56回応用物理学関係連合講演会, Mar. 2009, Japanese, 日本応用物理学会, つくば市, Domestic conference

  Oral presentation


• 高密度積層量子ドットにおける発光増強機構

  Masataka Mamizuka, Osamu Kojima, Tomoya Inoue, Takashi Kita, Osamu Wada

  第56回応用物理学関係連合講演会, Mar. 2009, Japanese, 日本応用物理学会, つくば市, Domestic conference

  Oral presentation


• Quantum Dots in a Vertical Cavity for All-Optical Switching Devices

  C Y Jin, O Kojima, T Kita, O Wada, M Hopkinson, K Akahane

  Proc. 20th International Conference on Indium Phosphide and Related Materials, Mar. 2009, English, Newport Beach, International conference

  Oral presentation


• InAs 量子ドットの積層構造制御と発光特性

  Tomoya Inoue, Kazumasa Kishimoto, Osamu Kojima, Takashi Kita, Osamu Wada

  第56回応用物理学関係連合講演会, Mar. 2009, Japanese, 日本応用物理学会, つくば市, Domestic conference

  Oral presentation


• GaAs薄膜における励起子過渡応答に対する空間コヒーレンス効果

  Osamu Kojima, Shingo Watanabe, Takashi Kita, Osamu Wada, Tosiro Isu

  第56回応用物理学関係連合講演会, Mar. 2009, Japanese, 日本応用物理学会, つくば市, Domestic conference

  Oral presentation


• Control of Exciton Fine Structure of Nitrogen Nanospace in GaAs

  T. Kita, Y Harada

  Abstr. 15th International Symposium on Intercalation Compounds, Mar. 2009, English, Beijing, International conference

  Oral presentation


• Quantum Dots in a Vertical Cavity for All‐Optical Switching Devices

  C Y Jin, O Kojima, T Kita, O Wada, M Hopkinson, K Akahane

  2009International conference on solid State Devices and Materials, 2009, English, miyagi, International conference

  Oral presentation


• 超高速全光スイッチに向けた励起子光学非線形応答制御

  Osamu Kojima, Takashi Kita, Osamu Wada, Tosiro Isu

  ナノ学会ナノ構造・物性部会 第1回研究会, Jan. 2009, Japanese, ナノ学会, 神戸市, Domestic conference

  Oral presentation


• 積層超高密度量子ドットの発光特性に対する3次元的結合効果

  Kojima Osamu, Nakatani Hiroaki, Kita Takashi, Wada Osamu, Kouichi Akahane, Masahiro Tsuchiya

  第19回光物性研究会, Dec. 2008, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• シアニン色素添加ポリマー薄膜における励起子緩和時間の制御

  Shogo Hamano, Osamu Kojima, Takashi Kita, Osamu Wada

  第19回光物性研究会, Dec. 2008, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• Side Electron Emission Device Using A Composite of Carbon Nanofibers and Aluminum

  H Tanaka, H Nakamura, H Yanagi, T Kita, K Yokoyama, A Magario, T Noguchi

  Abstr. 8th International Conference on Nano-Molecular Electronics 2008, Dec. 2008, English, Kobe, International conference

  Poster presentation


• Narrowband ultraviolet field-emission device using Gd-doped AlN

  T Kita, S Kitayama, M Kawamura, O Wada, Y Chigi, Y Kasai, T Nishimoto, H Tanaka, M Kobayash

  Abstr. The IUMRS International Conference in Asia, Dec. 2008, English, Nagoya, International conference

  [Invited]

  Invited oral presentation


• GaAs 薄膜における励起子ポラリトン伝播効果

  Shingo Watanabe, Osamu Kojima, Takashi Kita, Osamu Wada, Tosiro Isu

  第19回光物性研究会, Dec. 2008, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• 積層量子ドットにおける励起子発光強度に対する電子間結合効果

  Kojima Osamu, Nakatani Hiroaki, Kita Takashi, Wada Osamu, Kouichi Akahane, Masahiro Tsuchiya

  第69回応用物理学会学術講演会, Sep. 2008, Japanese, 日本応用物理学会, 春日井市, Domestic conference

  Oral presentation


• 原子層窒素ドーピングによるInAs 量子ドットからのIn 偏析制御

  Tomoya Inoue, Masataka Mamizuka, Osamu Kojima, Takashi Kita, Osamu Wada

  第69回応用物理学会学術講演会, Sep. 2008, Japanese, 日本応用物理学会, 春日井市, Domestic conference

  Poster presentation


• 原子層窒化InAs 量子ドットにおける励起子緩和時間の制御

  Masataka Mamizuka, Osamu Kojima, Tomoya Inoue, Takashi Kita, Osamu Wada

  第69回応用物理学会学術講演会, Sep. 2008, Japanese, 日本応用物理学会, 春日井市, Domestic conference

  Poster presentation


• GaAs 薄膜における励起子ポラリトン伝播効果の膜厚依存性

  Shingo Watanabe, Osamu Kojima, Takashi Kita, Osamu Wada, Tosiro Isu

  日本物理学会2008年秋季大会, Sep. 2008, Japanese, 日本物理学会, 盛岡市, Domestic conference

  Oral presentation


• GaAs 薄膜における閉じ込め励起子の密度制御

  Osamu Kojima, Takashi Kita, Osamu Wada, Tosiro Isu

  第69回応用物理学会学術講演会, Sep. 2008, Japanese, 日本応用物理学会, 春日井市, Domestic conference

  Oral presentation


• GaAs 薄膜における超高速励起子密度制御

  Osamu Kojima, Takashi Kita, Osamu Wada, Tosiro Isu

  日本物理学会2008年秋季大会, Sep. 2008, Japanese, 日本物理学会, 盛岡市, Domestic conference

  Poster presentation


• Selective Impurity Doping into InAs Quantum Dots by Controlling the Self-Assembled Process

  S Kido, T Inoue, T Kita, O Wada

  Abstr. 15th International Conference on Molecular Beam Epitaxy, Aug. 2008, English, Vancouver, International conference

  Oral presentation


• Influence of Indium Segregation on Optical Properties in InAs/GaAs Quantum Dots

  T Inoue, H Mizuno, M Mamizuka, O Kojima, T Kita, O Wada

  Abstr. 15th International Conference on Molecular Beam Epitaxy, Aug. 2008, English, Vancouver, International conference

  Oral presentation


• Influence of indium segregation on optical properties in InAs/GaAs quantum dots

  Tomoya Inoue, Masataka Mamizuka, Hiroshi Mizuno, Osamu Kojima, Takashi Kita, Osamu Wada

  15th International Conference on Molecular Beam Epitaxy, Aug. 2008, English, MBE国際会議組織委員会, Vancouver, International conference

  Poster presentation


• Transient Response in Negative Time Delay due to Pulse Propagation in GaAs Thin Films

  S Watanabe, O Kojima, T Kita, O Wada, M Tsuchiya

  Abstr. Third International Conference on Optical, Optoelectronic Materials and Applications, Jul. 2008, English, Edmonton, International conference

  Oral presentation


• Transient reflectivity response with negative time delay caused by femtosecond pulse propagation in GaAs thin films

  Shingo Watanabe, Osamu Kojima, Takashi Kita, Osamu Wada, Tosiro Isu

  Third International Conference on Optical, Optoelectronic and Photonic Materials and Applications, Jul. 2008, English, ICOOPMA組織委員会, Edmonton, International conference

  Poster presentation


• Propagation effect on transient response of excitons confined in GaAs thin films

  Shingo Watanabe, Osamu Kojima, Takashi Kita, Osamu Wada, Tosiro Isu

  第27回電子材料シンポジウム, Jul. 2008, Japanese, EMS組織委員会, 伊豆長岡, International conference

  Poster presentation


• Lengthening of photoluminescence decay time owing to expansion of electron envelope functions in stacked quantum dots

  Osamu Kojima, Hiroaki Nakatani, Takashi Kita, Osamu Wada, Kouichi Akahane, Masahiro Tsuchiya

  Third International Conference on Optical, Optoelectronic and Photonic Materials and Applications, Jul. 2008, English, ICOOPMA組織委員会, Edmonton, International conference

  Poster presentation


• Lengthening of Exciton Lifetime owing to Expansion of Electron Envelope Functions in Stacked Quantum Dots

  O Kojima, H Nakatani, T Kita, O Wada, K Akahane, M Tsuchiya

  Abstr. Third International Conference on Optical, Optoelectronic Materials and Applications,, Jul. 2008, English, Edmonton, International conference

  Poster presentation


• Growth and characterization of double-stacked InAs self-assembled quantum dots for polarization control of edge emission

  Tomoya Inoue, Kazumasa Kishimoto, Osamu Kojima, Takashi Kita, Osamu Wada

  第27回電子材料シンポジウム, Jul. 2008, Japanese, EMS組織委員会, 伊豆長岡, International conference

  Poster presentation


• Fine structure of bound excitons in nitrogen-doped GaAs

  T Kita, Y Harada, O Wada

  Abstr. The 15th International Conference on Luminescence and Optical Spectroscopy of Condenced Matter, Jul. 2008, English, Lyon, International conference

  Oral presentation


• Exciton Response Controlled by Introducing a Spacer Layer in Nitrided InAs Quantum Dots

  M Mamizuka, O Kojima, T Inoue, T Kita, O Wada

  Abstr. Third International Conference on Optical, Optoelectronic Materials and Applications, Jul. 2008, English, Edmonton, International conference

  Oral presentation


• Exciton response controlled by introducing a spacer layer in nitrided InAs quantum dots

  Masataka Mamizuka, Osamu Kojima, Tomoya Inoue, Takashi Kita, Osamu Wada

  Third International Conference on Optical, Optoelectronic and Photonic Materials and Applications, Jul. 2008, English, ICOOPMA組織委員会, Edmonton, International conference

  Poster presentation


• Bright flexible field emission display device using Carbon nanofiber nanosomposites

  M Kawamura, T Kita, O Wada, H Nakamura, H Yanagi, A Magario, T Noguchi

  Abstr. Carbon, Jul. 2008, English, Nagano, International conference

  Oral presentation


• Anisotropic Linear Polarization Luminescence in CdTe/CdMnTe Quantum Wires

  Y Harada, T Kita, O Wada, H. Ando, H Mariette

  Abstr. The 15th International Conference on Luminescence and Optical Spectroscopy of Condenced Matter, Jul. 2008, English, Lyon, International conference

  Oral presentation


• Optical Control of Residual Excitons for Ultrafast Nonlinear Response in GaAs Thin Films

  O Kojima, A Miyagawa, T Kita, O Wada, T Isu

  Abstr. 8th International Conference on Excitonic Process in Condensed Matter, Jun. 2008, English, Kyoto, International conference

  Oral presentation


• Optical control of residual excitons for ultrafast nonlinear response in GaAs thin films

  Osamu Kojima, Ayumi Miyagawa, Takashi Kita, Osamu Wada, Tosiro Isu

  8th International Conference on Excitonic Processes in Condensed Matter, Jun. 2008, English, EXCON組織委員会, 京都市, International conference

  Oral presentation


• Near-Field Photoluminescence of Exciton Magnetic Polarons in CdTe/Cd0.75Mn0.25Te Quantum Wires

  Y Harada, T Kita, O Wada, K Matsuda, Y Kanemitsu, H Ando, H Mariette

  Abstr. 8th International Conference on Excitonic Process in Condensed Matter, Jun. 2008, English, Kyoto,, International conference

  Oral presentation


• Exciton Fine Structure of Nitrogen Isoelectronic Center

  Y Harada, T Kita, O Wada

  Proc. 20th International Conference on Indium Phosphide and Related Materials, May 2008, English, Paris, International conference

  Oral presentation


• Tailor-Made Optical Properties of InAs Quantum Dots by Controlling Indium Segregation

  T Inoue, H Mizuno, M Mamizuka, O Kojima, T Kita, O Wada

  Abstr. International Conference on Physics of Light-Matter Coupling in Nanostructures, Apr. 2008, English, Tokyo, International conference

  Oral presentation


• Optical Cancellation of Exciton Population in GaAs Thin Films

  O Kojima, A Miygawa, T Kita, O Wada, T.Isu

  Abstr. 3rd International Laser, Light-Wave and Microwave Conference, Apr. 2008, English, Yokohama, International conference

  Oral presentation


• Optical cancellation of exciton population in GaAs thin films

  Osamu Kojima, Ayumi Miyagawa, Takashi Kita, Osamu Wada, Tosiro Isu

  Third International Laser, Light-Wave and Microwave Conference, Apr. 2008, English, ILLMC組織委員会, 横浜市, International conference

  Oral presentation


• 端面発光偏波制御を目指したInAs 量子ドット積層構造の作製

  Inoue Tomoya, Kishimoto Kazumasa, Kojima Osamu, Kita Takashi, Osamu Wada

  第55回応用物理学関係連合講演会, Mar. 2008, Japanese, 日本応用物理学会, 船橋市, Domestic conference

  Oral presentation


• 積層量子ドットにおける励起子振動子強度の温度依存性

  Nakatani Hiroaki, Kita Takashi, Kojima Osamu, Wada Osamu, Kouichi Akahane, Masahiro Tsuchiya

  第55回応用物理学関係連合講演会, Mar. 2008, Japanese, 日本応用物理学会, 船橋市, Domestic conference

  Oral presentation


• GaAs薄膜における閉じ込め励起子の超高速非線形応答の励起光強度依存性

  Kojima Osamu, Miyagawa Ayumi, Kita Takashi, Osamu Wada, Isu Toshiro

  第55回応用物理学関係連合講演会, Mar. 2008, Japanese, 日本応用物理学会, 船橋市, Domestic conference

  Oral presentation


• GaAs 薄膜における複数準位励起下での閉じ込め励起子の過渡反射スペクトル

  Watanabe Shingo, Kojima Osamu, Kita Takashi, Osamu Wada, Isu Toshiro

  日本物理学会第63回年次大会, Mar. 2008, Japanese, 日本物理学会, 東大阪市, Domestic conference

  Poster presentation


• スペクトル分解反射型ポンプ・プローブ法によるGaAs薄膜中閉じ込め励起子の過渡応答測定

  Watanabe Shingo, Kojima Osamu, Kita Takashi, Osamu Wada, Isu Toshiro

  第18回光物性研究会, Dec. 2007, Japanese, 光物性研究会組織委員会, 大阪市, Domestic conference

  Poster presentation


• A Specimen Preparation Technique for 3D Charactreization of Nano Materials at Specific-Site Using FIB-STEM/TEM System

  Yaguchi Toshie, Konno Mitsuru, Kamino Takeo, Nakamura K, Azuma J, Kita Takashi, Inoue Tomoya

  MRS Fall Meeting, Nov. 2007, English, Boston, International conference

  Oral presentation


• Three-Dimensional Structure of A Single InAs/GaAs Self-Assembled Quantum Dot Observed by Electron Tomography

  Inoue Tomoya, Kita Takashi, Wada Osamu, Konnno Mitsuru, Yagushi Toshie, Kamino Takeo

  International Symposium on Compound Semiconductors, Oct. 2007, English, Kyoto, International conference

  Oral presentation


• Exciton Fine Sructure of Isoelectronic Centers in Nitrogen Doped GaAs

  Kita Takashi, Harada Yukihiro, Inoue Tomoya, Wada Osamu

  International Symposium on Compound Semiconductors, Oct. 2007, English, Kyoto, International conference

  Poster presentation


• Anisotropic Zeeman Effect in CdTe/CdMnTe Quantum Wires

  Harada Yukihiro, Kita Takashi, Wada Osamu, Ando Hiroaki, Mariette Henri

  International Symposium on Compound Semiconductors, Oct. 2007, English, Kyoto, International conference

  Poster presentation


• 3D Characterization of A Single InAs Quantm Dot

  Konno Mitsuru, Yaguchi Toshie, Konno Takeo, Nakamura K, Azuma J, Kita Takashi, Inoue Tomoya

  6th Internaltiona Symposium on Atomic Level Characterizations for New Materials and Devices, Oct. 2007, English, Kanazawa, International conference

  Poster presentation


• GaAs量子ドットの発光偏光特性

  Inui Akitoshi, Kido Satoshi, Kojima Osamu, Kita Takashi, Wada Osamu

  第68回応用物理学会学術講演会, Sep. 2007, Japanese, 日本応用物理学会, 札幌市, Domestic conference

  Oral presentation


• Control of Optical Polarization in Quantum Dots

  Kita Takashi

  2007 Japan-Germany Nanophotonics Seminar, Sep. 2007, English, Yonago, International conference

  [Invited]

  Invited oral presentation


• Anisotropic Magnetic-Field Evolution of Radiative Recombination Lifetime in CdTe/CdMnTe Quantum Wires

  Harada Yukihiro, Kita Takashi, Wada Osamu, Ando Hiroaki, Mariette Henri

  International Conference on II-VI Compounds, Sep. 2007, English, Jeju, International conference

  Oral presentation


• Optical Emission and Dynamics from Coupled States in Stacked Quantum Dots

  Nakatani Hiroaki, Kita Takashi, Kojima Osamu, Wada Osamu, Kouichi Akahane, Masahiro Tsuchiya

  第26回電子材料シンポジウム 論文集、pp. 157-158 G4, Jul. 2007, Japanese, EMS組織委員会, 大津市, Domestic conference

  Poster presentation


• Photoluminescence dynamics of coupled quantum dots

  Nakatani Hiroaki, Kita Takashi, Kojima Osamu, Wada Osamu, Akahane Kouichi, Tsuchiya Masahiro

  16th International Conference on Dynamical Processes in Excited States of Solids, Jun. 2007, English, DPC組織委員会, Segovia, Spain, International conference

  Poster presentation


• Real Time Probing of Self-Assembling Process Steps in InAs/GaAs Quantum Dot Growth

  Kudo Takuya, Inoue Tomoya, Kita Takashi, Wada Osamu

  Proc. 19th International Conference on Indium Phosphide and Related Materials, May 2007, English, Matsue, International conference

  Poster presentation


• Multidirectional Transmission Electron Microscope Observation of a Single InAs/GaAs Self-Assembled Quantum Dot

  Inoue Tomoya, Kita Takashi, Wada Osamu, Konno Mitsuru, Yaguchi Toshie, Kamino Takeo

  19th International Conference on Indium Phosphide and Related Materials, May 2007, English, Matsue, International conference

  Oral presentation


• Control of Optical Emission from Coupled Excitonic States in Quantum Dot Superlattice Structures

  Nakatani Hiroaki, Kita Takashi, Kojima Osamu, Wada Osamu, Akahane Kouichi, Tsuchiya Masahiro

  19th International Conference on Indium Phosphide and Related Materials, May 2007, English, IPRM組織委員会, Matsue, Japan, International conference

  Poster presentation


• 結合量子ドットの発光ダイナミクス

  H. Nakatani, T. Kita, Osamu Kojima, O. Wada, K. Akahane, M. Tsuchiya

  第54回応用物理学関係連合講演会, Mar. 2007, Japanese, 青山学院大学, Domestic conference

  Oral presentation


• Bright Electron Emission from Si-doped AlN Thin Films

  KIAHIMOTO Atsunori, INOU Yoshiki, KITA Takashi, WADA Osamu

  International Workshop on Nitride Semiconductors 2006, Oct. 2006, English, Kyoto, Japan, International conference

  Poster presentation


• High-Resolutioon Transimission Electron Microscope Study on Nitrided InAs/GaAs Quantum Dots

  INOUE T, MATSUSHITA K, KITA Takashi, WADA Osamu, MORI H, YASUDA H

  The 16th International Microscopy Congress, Sep. 2006, English, Sapporo, International conference

  Oral presentation


• Atomically Controlled Doping of Nitrogen on GaAs(001) Surfaces

  SHIMIZU N, INOUE T, KITA Takashi, WADA Osamu

  The 14th International Conference on Molecular Beam Epitaxy, Sep. 2006, English, Tokyo, International conference

  Oral presentation


• Magnetic-Field Evolution of Valence-Band States in One-Dimensional Diluted Magnetic Semiconductors

  HARADA Yukihiro, KITA Takashi, WADA Osamu, ANDO Hiroaki

  28th International Conference on the Physics of Semiconductors, Jul. 2006, English, Vienna, International conference

  Poster presentation


• Confined Electronic Structures of Nitrogen Isoelectronic Centers in GaAs Grown by Atomically Controlled Doping Technique

  KITA Takashi, WADA Osamu

  28th International Conference on the Physics of Semiconductors, Jul. 2006, English, Vienna, International conference

  Poster presentation


• Excitonic State and Magnetic Effects in CdTe/Cd(Mg,Mn)Te Quantum Wires

  KITA Takashi

  7th International Conference on Excitonic Process in Condensed Matter, Jun. 2006, English, Winston-Salem, International conference

  [Invited]

  Invited oral presentation


• Emission-Wavelength Extension of Nitrided InAs/GaAs Quantum Dots with Different Sizes

  MIZUNO H, INOUE T, KIKUNO M, KITA Takashi, WADA Osamu

  The 14th International Conference on Molecular Beam Epitaxy, Jun. 2006, English, Tokyo, International conference

  Oral presentation


• Polarization Insensitive Optical Gain of Columnar Quantum Dots

  KITA Takashi, TAMURA N, WADA Osamu, SUGAWARA M, NAKAYA Y, EBE H, ARAKAWA Y

  4th International Conference on Semiconductor Quantum Dots 2006, May 2006, English, Chamonix, International conference

  Poster presentation


• Magneti-Field Sensitive Polarization Anisotropy in One-Dimensional Diluted Magnetic Semiconductors

  HARADA Yukihiro, KITA Takashi, WADA Osamu, ANDO Hiroaki

  CLEO/QELS, May 2006, English, Long Beach, International conference

  Oral presentation


• Emission-Wavelength Extension of InAs/GaAs Quantum Dots by Controlling Lattice-Mismatched Strain

  INOUE T, MATSUSHITA K, KIKUNO M, KITA Takashi, WADA Osamu

  Proc. 18th International Conference on Indium Phosphide and Related Materials, May 2006, English, Princeton, International conference

  Oral presentation


• 低温成長AIMを用いた有機電界放出発光素子

  藤井 俊輔, 河井 康史, 日野 大輔, 柳 久雄, 喜多 隆, 和田 修

  第52回応用物理学関係連合講演会,30a-YL-12, Mar. 2005, Japanese, 応用物理学会, 埼玉大学, Domestic conference

  Oral presentation


• 原子層窒化によるInAs/GaAs量子ドット発光の長波長化－量子ドット発光の窒化条件依存性－

  菊野 美緒, 森 孝嘉, 関 浩行, 松下 和征, 水野 博司, 清水 範彦, 井上 知也, 喜多 隆, 和田 修

  第52回応用物理学関係連合講演会,30a-ZM-1, Mar. 2005, Japanese, 応用物理学会, 埼玉大学, Domestic conference

  Oral presentation


• 原子層窒化InAs/GaAs量子ドットの長波長化発光メカニズム

  松下 和征, 井上 知也, X Z Shang, 森 孝嘉, 関 浩行, 菊野 美緒, 喜多 隆, 和田 修, 森 博太郎, 坂田 孝夫, 保田 英洋

  第52回応用物理学関係連合講演会,30a-ZM-3, Mar. 2005, Japanese, 応用物理学会, 埼玉大学, Domestic conference

  Oral presentation


• InAs/GaAsコラム量子ドットの発光強度の積層数依存性

  田村 暢哲, 喜多 隆, 和田 修, 江部 広治, 菅原 充, 荒川 泰彦, 中田 義昭

  第52回応用物理学関係連合講演会,30a-ZM-8, Mar. 2005, Japanese, 応用物理学会, 埼玉大学, Domestic conference

  Oral presentation


• 低温成長AIN薄膜を用いた有機電界放出型発光素子

  藤井 俊輔, 河井 康史, 日野 大輔, 柳 久雄, 喜多 隆, 和田 修

  第52回応用物理学関係連合講演会, 2005, Japanese, 応用物理学会, 埼玉大学, Domestic conference

  Oral presentation


• Valence-Band Mixing Induced by sp-d Exchange Interaction in CdMnTeQuantum Wirs

  HARADA Yukihiro, KITA Takashi, WADA Osamu, MARSAL L, MARIETTE H, ANDO H

  International Symposium on Compound Semiconductors 2005, 2005, English, Rust, International conference

  Oral presentation


• Valence-Band Mixing in CdTe/CdMnTeNano-Wire Structures in Magnetic Field

  HARADA Yukihiro, NAGANUMA R, KITA Takashi, WADA Osamu, MARIETTE H, ANDO H

  International Conference on Quantum Electronics 2005 and the Pacific Rim Conference on Laser and Electro-Optics 2005, 2005, English, Tokyo, International conference

  Oral presentation


• Long-Wavelength Emission from Strain Controlled InAs/GaAs Self-Assembled Quantum Dots

  INOUE T, MATSUSHITA K, KIKUNO M, KITA Takashi, WADA Osamu, MORI H, SAKATA T, YASUDA H

  2005 International Conference on Solid State Device and Materials, 2005, English, Kobe, International conference

  Oral presentation


• InGaAs Capping Layer Caused Modification to the Optical Properties of InAs Quantum Dot

  ZHANG Y, KITA Takashi, WADA Osamu, NAKATA Y, EBE H, SUGAWARA M, ARAKAWA Y

  International Conference on Materials for Advanced Technologies 2005, 2005, English, Singapore, International conference

  Poster presentation


• Emission-Wavelength Extension in Nitrided InAs/GaAs Self-Assembled Quantum Dots

  KITA Takashi, MATSUSHITA K, KIKUNO M, INOUE T, MORI T, SEKI H, WADA Osamu, MORI H, SAKATA T, YASUDA H

  International Symposium on Quantum Dots and Photonic Crystal 2005, 2005, English, Tokyo, International conference

  Poster presentation


• Bound-Exciton Luminescence from Nitrogen Doped GaAs Grown by Site-Controlled Doping Technique

  KITA Takashi, WADA Osamu

  International Conference on Quantum Electronics 2005 and the Pacific Rim Conference on Laser and Electro-Optics 2005, 2005, English, Tokyo, International conference

  [Invited]

  Invited oral presentation


• Thermal Carrier Activation Process in InGaAs Capped InAs Quantum Dots

  Y C Zhang, KITA Takashi, WADA Osamu, NAKATA Y, EBE H, SUGAWARA M, ARAKAWA Y

  Extended Abstr. International Symposium on Quantum Dots and Photonic Crystal 2005,Tokyo, Sep. 2004, English


• 原子層窒化によるInAs量子ドット発光の長波長化を波長制御

  森 孝嘉, 関 浩行, 菊野 美緒, 松下 和征, 喜多 隆, 和田 修

  第65回応用物理学会学術講演会,1a-P2-4, Sep. 2004, Japanese, 応用物理学会, 東北学院大学, Domestic conference

  Oral presentation


• Optical Polarization Properties of InAs/GaAs Quantum Dot Semiconductor Optical Amplifier.

  P Jayavel, KITA Takashi, WADA Osamu, EBE H, SUGAWARA M, NAKATA Y, AKIYAMA T, TAKEBAYASHI J, ARAKAWA Y

  Extended Abstr. 2004 International Conference on Solid State Device and Materials (p.7-3), Sep. 2004, English, Tokyo, Domestic conference

  Oral presentation


• InAs量子ドット表面の窒化による成長界面の制御

  関 浩行, 森 孝嘉, 菊野 美緒, 松下 和行, 喜多 隆, 和田 修, 中田 義昭, 秋山 知之, 江部 広治, 菅原 充, 荒川 泰彦

  第65回応用物理学会学術講演会,シンポジウム「量子ドットの将来像と実現のためのマイルストーン」, Sep. 2004, Japanese, 応用物理学会, 東北学院大学, Domestic conference

  Oral presentation


• InAs量子ドット成長のその場RDS評価と界面制御

  喜多 隆

  第65回応用物理学会学術講演会、シンポジウム「量子ドットの将来像と実現のためのマイルストーン」, Sep. 2004, Japanese, 応用物理学会, 仙台, Domestic conference

  Oral presentation


• GsAs(001)に挿入した窒素原子層の創るisoelectronic trapからの狭線幅発光

  長浜 崇裕, 高 一邦, 喜多 隆, 和田 修

  第65回応用物理学会学術講演会,1a-P1-3, Sep. 2004, Japanese, 応用物理学会, 東北学院大学, Domestic conference

  Oral presentation


• CdTe/CdMnTe量子細線における励起子磁気ポーラロンの異方的なエネルギー緩和特性

  永沼 良太, 原田 幸弘, 喜多 隆, 和田 修, L Marsal, H Mariette

  日本物理学会2004年秋季大会,14aYC-3, Sep. 2004, Japanese, 日本物理学会, 青森大学, Domestic conference

  Oral presentation


• Anisotropic Exchange Interaction caused by Hole-Spin Reorientation in (CdTe)0.5(CdMnTe)0.5 Tilted Superlattices Grown in CdMgTe(001) Visinal Surface.

  KITA Takashi, NAGAHARA S, NAGANUMA R, HARADA Y, WADA Osamu, L Marsal, H Mariette

  14th International Conference on Crystal Growth.(T02-1-4), Aug. 2004, English, Grenoble, International conference

  Oral presentation


• Ultrafast Anisotropic Processes of Exciton Magnetic Polarons in CdTe/CdMnTe Quantum Wires.

  NAGANUMA R, KITA Takashi, NAGAHARA S, WADA Osamu, L Marsal, H Mariette

  The 2004 International Conference on Ultrafast Phenomena., Jul. 2004, English, Niigata, Domestic conference

  Oral presentation


• Order-Parameter Dependence of Sponteneous Electron Accumulation at GaInP/GaAs Studied by Raman-Scattering and Photoluminescence.

  YAMASHITA K, OE K, KITA Takashi, WADA Osamu, Y Wang, C Geng, F Scholz, H Schweizer

  27th International Conference on the Physics and Semicinductors.（H5-95), Jul. 2004, English, Flagstaff Arizona, International conference

  Oral presentation


• Hole-Spin Reorentation in (CdTe)0.5 Tiltid Superlattices Grown on CdMgTe(001) Visinal Surface.

  KITA Takashi, NAGAHARA S, NAGANUMA R, HARADA Y, WADA Osamu, L Marsal, H Mariette

  27th International Conference on the Physics and Semicinductors.（J5-67), Jul. 2004, English, Flagstaff Arizona, International conference

  Oral presentation


• Anisotropic Magneto-Optical Effects in CdTe/CdMnTe Tilted Superlattices Grown on CdTe0.74Mg0.26Te(001)Vicinal Surface

  NAGANUMA R, HARADA Y, KITA Takashi, WADA Osamu, L Marsal, H Mariette

  23th Electronic Materials Symposium, Jul. 2004, English, 未記入, Izu, Domestic conference

  Oral presentation


• 1.3 micro-m Emission from Nitridized InAs Quantum Dot

  MORI T, MASUDA Y, SEKI H, MATSUSHITA K, KITA Takashi, WADA Osamu

  23th Electronic Materials Symposium, Jul. 2004, English, 未記入, Izu, Domestic conference

  Oral presentation


• Temperature-Optimized Nitridation of Self-Assembled InAs/GaAs Quantum Dots for Long-Wavelength Emission

  KITA Takashi, MASUDA Y, SEKI H, MORI Takayoshi, WADA Osamu

  Abstr.3rd International Conference on Semiconductor Quantum Dots,THP8,Banff, May 2004, English


• Nitridized InAs/GaAs Self-Assembled Quantum Dots for Optical Communication Wavelength.

  KITA Takashi, MASUDA Y, MORI T, WADA Osamu

  Proc. 16th International Conference on Indium Phosphide and Related Materials.(pp. 640-642), May 2004, English, Kagoshima, Domestic conference

  Oral presentation


• Narrow Bandwidth Photoluminescence Lines from Nitrogen Doped GaAs Grown by Atomically Controlled Doping.

  KITA Takashi, KOU K, WADA Osamu

  Abstr. European Material Research Society （1337）, May 2004, English, Strasburg, International conference

  Oral presentation


• Capping Layer Induced Optical Polarization Control of InAs/GaAs Quantum Dots.

  P Jayavel, TANAKA H, UCHIGAMI M, KITA Takashi, WADA Osamu, NAKATA Y, AKIYAMA T, EBE H, SUGAWARA M, TATEBAYASHI J, ARAKAWA Y

  Abstr. 3rd International Conference on Semiconductor Quantum Dots, TP15, May 2004, English, Banff, International conference

  Oral presentation


• 低温成長AIN薄膜の電子エミッション特性に及ぼすSiドープの影響

  日野 大輔, 武智 正紀, 藤井 俊輔, 喜多 隆, 和田 修, 潘 路軍, 中山 喜萬

  第51回応用物理学関係連合講演会 （30p-YN-13), Mar. 2004, Japanese, 応用物理学会, 東京工科大学, Domestic conference

  Oral presentation


• 原子層窒化によるInAs量子ドット発光の長波長化

  関 浩行, 増田 吉孝, 森 孝嘉, 菊野 美緒, 松下 和征, 喜多 隆, 和田 修

  第51回応用物理学関係連合講演会 （30p-YG-17), Mar. 2004, Japanese, 応用物理学会, 東京工科大学, Domestic conference

  Oral presentation


• CdTe/CdMnTeナノワイヤ構造におけるZeemanシフトの異方性と正孔スピンの再配列

  永原 靖治, 喜多 隆, 原田 幸弘, 永沼 良太, 松浦 佑一郎, 和田 修, H Mariette

  第51回応用物理学関係連合講演会 （28p-ZK-10), Mar. 2004, Japanese, 応用物理学会, 東京工科大学, Domestic conference

  Oral presentation


• CdTe/CdMnTeナノワイヤにおける磁気ポーラロン形成

  永沼 良太, 原田 幸弘, 松浦 佑一郎, 永原 靖治, 喜多 隆, 和田 修, MARIETTE H

  日本物理学会第59回年次大会 29aYF-12, Mar. 2004, Japanese, 日本物理学会, 九州大学, Domestic conference

  Oral presentation


• CdTe/CdMnTeナノワイヤにおけるホールスピン配向の面内磁場異方性

  原田 幸弘, 永沼 良太, 松浦 佑一郎, 永原 靖治, 喜多 隆, 和田 修, MARIETTE H

  日本物理学会第59回年次大会 29aYF-11, Mar. 2004, Japanese, 日本物理学会, 九州大学, Domestic conference

  Oral presentation


• 磁性イオンを希薄ドープした半導体量子ナノワイヤ中のスピン制御

  永原 靖治, 喜多 隆, 和田 修, MARIETTE H

  平成15年度材料学会半導体エレクトロニクス部門委員会研究会, Jan. 2004, Japanese, 神戸大学ベンチャービジネスラボラトリー, Domestic conference

  Oral presentation


• 量子ドットの偏光制御とSOAへの応用

  田中 宏和, JAYAVEL P, 内上 昌裕, 喜多 隆, 和田 修, 中田 義昭, 秋山 知之, 江部 広治, 菅原 充, 荒川 泰彦

  Pre-Conference of IEEE International Semiconductor Laser Conference 2004, IEICE LQE/OPE Technical Meeting., Dec. 2003, Japanese, Kobe, Domestic conference

  Oral presentation


• 窒素を希薄ドープしたGaAsからの狭線幅発光

  高 一邦, 喜多 隆, 和田 修

  第14回光物性研究会研究会 pp.339-342, Dec. 2003, Japanese, 光物性研究会, 大阪市立大学, Domestic conference

  Oral presentation


• CdTe/CdMnTe量子細線における磁気ポーラロン形成

  永原 靖治, 松浦 佑一郎, 永沼 良太, 喜多 隆, 和田 修, MARIETTE H

  第14回光物性研究会研究会 pp.263-266, Dec. 2003, Japanese, 光物性研究会, 大阪市立大学, Domestic conference

  Oral presentation


• CdTe/CdMnTe量子細線における交換相互作用の面内異方性

  永沼 良太, 原田 幸弘, 松浦 佑一郎, 永原 靖治, 喜多 隆, 和田 修, MARIETTE H

  第14回光物性研究会研究会 pp.259-262, Dec. 2003, Japanese, 光物性研究会, 大阪市立大学, Domestic conference

  Oral presentation


• Optical Properties of Nitridized InAs Quantum Dots.

  KITA Takashi, MASUDA Y, MORI T, WADA Osamu

  Abstr. International Symposium on Quantum Dots and Photonic Crystals 2003, P-15, Nov. 2003, English, Tokyo, Domestic conference

  Oral presentation


• Optical Polarization Control in Edge-Emitting InAs/GaAs Quantum Dot.

  JAYAVEL P, TANAKA H, KITA Takashi, WADA Osamu, NAKATA Y, AKIYAMA T, EBE H, SUGAWARA M, TATEBAYASHI J, ARAKAWA Y

  Abstr. International Symposium on Quantum Dots and Photonic Crystals 2003, P-19, Nov. 2003, English, Tokyo, Domestic conference

  Oral presentation


• 微傾斜基盤上のCdTe/CdMnTe分数層超格子における交換相互作用の異方性と量子細線特性

  永原 靖治, 松浦 佑一郎, 永沼 良太, 喜多 隆, 和田 修, MARIETTE H

  日本物理学会2003年秋期大会, 21aTH-3, Sep. 2003, Japanese, 日本物理学会, 宮崎ワールドコンベンションセンター, Domestic conference

  Oral presentation


• Control of InGaAs Capping Layer Induced Optical Polarization in Edge-Emitting Photoluminescence of InAs Quantum Dots.

  JAYAVEL P, TANAKA H, KITA Takashi, WADA Osamu, NAKATA Y, AKIYAMA T, EBE H, SUGAWARA M, TATEBAYASHI J, ARAKAWA Y

  Extended Abstr. 2003 International Conference on Solid State Device and Materials., Sep. 2003, English, Tokyo, Domestic conference

  Oral presentation


• 低温成長AlSiN薄膜からの高効率電子放出

  武智 正紀, 日野 大輔, 喜多 隆, 和田 修, 番 路軍, 中山 喜萬

  第64回応用物理学会学術講演会 30p-G-16, Aug. 2003, Japanese, 応用物理学会, 福岡, Domestic conference

  Oral presentation


• 窒素をデルタドープしたGaAs(001）からの狭線幅発光

  高 一邦, 喜多 隆, 和田 修

  第64回応用物理学会学術講演会 1p-K-6, Aug. 2003, Japanese, 応用物理学会, 福岡, Domestic conference

  Oral presentation


• 原子層窒化によるInAs量子ドット発光の長波長化

  増田 吉孝, 森 孝嘉, 喜多 隆, 和田 修

  第64回応用物理学会学術講演会 31p-K-15, Aug. 2003, Japanese, 応用物理学会, 福岡, Domestic conference

  Oral presentation


• InAs量子ドットの端面発光における偏光特性の制御

  田中 宏和, JAYAVEL P, 喜多 隆, 和田 修, 江部 広治, 菅原 充, 館林 潤, 荒川 泰彦, 中田 義昭, 秋山 知之

  第64回応用物理学会学術講演会 31p-K-14, Aug. 2003, Japanese, 応用物理学会, 福岡, Domestic conference

  Oral presentation


• CdTe/CdMgTe量子細線におけるスピン緩和特性

  坪井 聡, 長濱 崇裕, 永原 靖治, 喜多 隆, 和田 修, MARSAL L, MARIETTE H

  第64回応用物理学会学術講演会 31p-ZF-3, Aug. 2003, Japanese, 応用物理学会, 福岡, Domestic conference

  Oral presentation


• CdTe/(Cd,Mn)Te量子細線中の磁気ポーラロン形成

  松浦 佑一郎, 永沼 良太, 永原 靖治, 喜多 隆, 和田 修, MARSAL L, MARIETTE H

  第64回応用物理学会学術講演会 2a-ZL-8, Aug. 2003, Japanese, 応用物理学会, 福岡, Domestic conference

  Oral presentation


• Spin Relaxiation Process in CdTe/CdMgTe Quantum Wires

  NAGAHARA S, KITA Takashi, WADA Osamu, MARSEL L, MARIETTE H

  Abstr. The 10th International Workshop on Femtosecond Technology, WP-26, p.120, Jul. 2003, English, Tsukuba, Domestic conference

  Oral presentation


• Polarization Controle of Cleaved-Edge Photoluminescence from InAs Quantum Dots Capped by InGaAs.

  TANAKA H, JAYAVEL P, KITA Takashi, WADA Osamu, EBE H, SUGAWARA M, TATEBAYASHI J, ARAKAWA Y, NAKATA Y, AKIYAMA T

  Proc. 22th Electronic Materials Symposium, H14, p.277-278, Jul. 2003, English, Moriyama, Domestic conference

  Oral presentation


• Photoluminescence from Postnitridized InAs Quantum Dots.

  MASUDA Y, MORI T, KITA Takashi, WADA Osamu

  Proc. 22th Electronic Materials Symposium, H13, pp.275-276, Jul. 2003, English, Moriyama, Domestic conference

  Oral presentation


• Observation of Anisotropic Giant Magneto-Optical Effects in CdTe/CdMnTe Quantum Wires.

  NAGAHARA S, MATSUURA Y, NAGANUMA R, KITA Takashi, WADA Osamu, MARSAL L, MARIETTE H

  Proc. 22th Electronic Materials Symposium, I6, p.291-292, Jul. 2003, English, Moriyama, Domestic conference

  Oral presentation


• Narrow Bandwidth Photoluminescence from Nitrogen-Delta Doped GaAs.

  KOU K, YAMAMIZU H, KITA Takashi, WADA Osamu

  Abstr. The 10th International Workshop on Femtosecond Technology, WP-25, p.119, Jul. 2003, English, Tsukuba, Domestic conference

  Oral presentation


• InAsN Quantum Dots Fabricated by Posnitridation of InAs.

  KITA Takashi, MASUDA Y, MORI T, WADA Osamu

  Abstr. The 11th International Conference on Modulated Semiconductor Structures, Jul. 2003, English, Nara, Domestic conference

  Oral presentation


• Highly Efficient Field Emission from Low Temperature Grown AlSiN Thin Film.

  TAKECHI M, HINO D, KITA Takashi, WADA Osamu, PAN L, NAKAYAMA Y

  Proc. 22th Electronic Materials Symposium, G12, pp.241-242, Jul. 2003, English, Moriyama, Domestic conference

  Oral presentation


• Excitation Intensity Dependence of Edge-Emitting Photoluminescence Properties in InAs Quantum Dots.

  JAYAVEL P, TANAKA H, KITA Takashi, WADA Osamu, NAKATA Y, AKIYAMA T, EBE H, SUGAWARA M, TATEBAYASHI J, ARAKAWA Y

  Abstr. The 10th International Workshop on Femtosecond Technology, TB-6, p.67, Jul. 2003, English, Tsukuba, Domestic conference

  Oral presentation


• Anisotropic Magneto-Optical Effects in CdTe/CeMnTe Tilted Superlattices Grown on CdTe0,74Mg0.26Te(001) Vicinal Surface.

  NAGANUMA R, HARADA Y, KITA Takashi, WADA Osamu, L Marsal, H Mariette

  Proc. 23th Electronic Materials Symposium., Jul. 2003, English, Izu, Domestic conference

  Oral presentation


• Anisotropic Exchange Interaction in CdTe/CdMnTe Quantum Wires.

  NAGAHARA S, MATSUURA Y, NAGANUMA R, KITA Takashi, WADA Osamu, MARSAL L, MARIETTE H

  Abstr. The 11th International Conference on Modulated Semiconductor Structures, Jul. 2003, English, 未記入, Nara., Domestic conference

  Oral presentation


• 1.3 Micro-m Emission from Mitridized InAs Quantum Dot.

  MORI T, MASUDA Y, SEKI H, MATUSHITA K, KITA Takashi, WADA Osamu

  Proc. 23th Electronic Materials Symposium., Jul. 2003, English, Izu, Domestic conference

  Oral presentation


• Wideband Polarization Insensitivity in Quantum Dot Optical Amplifier.

  KITA Takashi, JAYAVEL P, TANAKA H, KHO K, WADA Osamu, NAKATA Y, AKIYAMA T, EBE H, SUGAWARA M, TATEBAYASHI J, ARAKAWA Y

  Abstr.2003 Conference on Lasers and Electro-Optics, p.116, Jun. 2003, English, Baltimore, International conference

  Oral presentation


• Selective Characterization of Interface Electric Field in GaAs/GaInP Heterojunction Bipolar Transistor by Fourier Transformed Photoreflectance.

  KITA Takashi, KAKUTANI T, WADA Osamu, TSUCHIYA T, SAHARA M, SAKAGUCHI H

  Proc. 15th International Conference on Indium Phosphide and Related Materials., May 2003, English, Santa Barbara, International conference

  Oral presentation


• Photoluminescence Polarization Properties and Electronic States in InAs/GaAs Self-Assembled Quantum Dots.

  JAYAVEL P, TANAKA H, KITA Takashi, WADA Osamu, EBE H, SUGAWARA M, TATEBAYASHI J, ARAKAWA Y, NAKATA Y, AKIYAMA T

  ナノ学会 PpⅡｰ7, May 2003, English, ナノ学会, 神戸大学, Domestic conference

  Oral presentation


• 歪キャップ層導入によるInAｓ量子ドットの端面発光偏光特性の制御

  田中 宏和, P Jayavel, 嶋田 善和, 喜多 隆, 和田 修, 江部 広治, 菅原 充, 館林 潤, 荒川 泰彦, 中田 義昭

  第50回応用物理学関係連合講演会 (29a-YAｰ11), Mar. 2003, Japanese, 応用物理学会, 神奈川大学, Domestic conference

  Oral presentation


• 高濃度SiドープAINの基礎吸収端構造

  武智 正紀, 折口 貴彦, 日野 大輔, 喜多 隆, 和田 修

  第50回応用物理学関係連合講演会 (29p-V-7), Mar. 2003, Japanese, 応用物理学会, 神奈川大学, Domestic conference

  Oral presentation


• CdTe/CdMgTe量子細線における磁気工学特性の異方性

  NAGAHARA S, MATSUURA Y, NAGANUMA R, KITA Takashi, WADA Osamu, L Marsal, H Mariette

  第50回応用物理学関係連合講演会 (29a-ZH-8), Mar. 2003, Japanese, 応用物理学会, 神奈川大学, Domestic conference

  Oral presentation


• 歪キャップ層導入によるInAs量子ドットの端面発光偏光特性の制御

  田中 宏和, JAYAVEL Pachumuthu, 嶋田 善和, 喜多 隆, 和田 修, 江部 広治, 菅原 充, 館林 潤, 荒川 泰彦, 中田 義昭, 秋山 友之

  第50回応用物理学関係連合講演会, 2003, Japanese, 応用物理学会, 神奈川大学, Domestic conference

  Others


• 高濃度SiドープAINの基礎吸収端構造

  武智 正紀, 折口 貴彦, 日野 大輔, 喜多 隆, 和田 修

  第50回応用物理学関係連合講演会, 2003, Japanese, 応用物理学会, 神奈川大学, Domestic conference

  Others


• CdTe/CdMgTe量子細線における磁気光学特性の異方性

  永原 靖治, 松浦 佑一郎, 永沼 良太, 喜多 隆, 和田 修, MARSAL Laurent, MARIETTE Henri

  第50回応用物理学関係連合講演会, 2003, Japanese, 応用物理学会, 神奈川大学, Domestic conference

  Others