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Koga Takaaki

Faculty of Information Science and Technology　Electronics for Informatics　Advanced ElectronicsAssociate Professor

Researcher basic information

■ Degree
  • Ph.D., Harvard University
  • S.M., Harvard University
  • Licentiate of Engineering, Stockholm Institute of Technology in Stockholm
■ URL
researchmap URLホームページURL■ Various IDs
J-Global ID■ Research Keywords and Fields
Research Keyword
  • 半導体スピン物性
  • Semiconductor Spintronics
Research Field
  • Nanotechnology/Materials, Crystal engineering
  • Nanotechnology/Materials, Applied physical properties
  • Natural Science, Semiconductors, optical properties of condensed matter and atomic physics
■ Educational Organization

Career

■ Career
Career
  • 2001 - 2005
    (独)科学技術振興機構 さきがけ研究者
  • 2001 - 2005
    Researcher, Precursory Research for Embryonic Science and Technology (PRESTO),Japan Science and Technology Agency
  • 2004
    - 北海道大学 大学院情報科学研究科 助教授
  • 2004
    - Associate Professor,Graduate School of Information Science and Technology, Hokkaido University
  • 2000 - 2001
    NTT(株)物性科学基礎研究所 リサーチアソシエイト
  • 2000 - 2001
    Research Associate,NTT Basic Research Laboratories
  • 1994 - 2000
    Harvard University
  • 1994 - 2000
    Graduate Student,Harvard University
Educational Background
  • 2000, Harvard University, 大学院工学及び応用理学研究科, 応用物理学専攻, United States
  • 2000, Harvard University, Graduate School of Arts and Sciences, Division of Engineering and Applied Sciences, Applied Physics
  • 1995, Harvard University, 大学院工学及び応用理学研究科, 応用物理学専攻, United States
  • 1995, Harvard University, Graduate School of Arts and Sciences, Division of Engineering and Applied Sciences, Applied Physics
  • 1994, ストックホルム王立工科大学, 物理学科, 凝縮系物理学
  • 1994, Royal Institute of Technology in Stockholm, School of Physics, Department of Condensed Matter Physics
  • 1992, The University of Tokyo, The Faculty of Engineering, 工業化学科, Japan
  • 1992, The University of Tokyo, Faculty of Engineering, Department of Industrial Chemistry

Research activity information

■ Awards
  • Mar. 2004, NTT物性科学基礎研究所, 所長表彰業績賞
    ゲートを用いた半導体中のスピン制御
    KOGA Takaaki
  • Aug. 1999, The 11th International Conference on Thermoelectrics, Best Paper Award
    Carrier Pocket Engineering to Design Superior Thermoelctric Materials Using Superlattice Structures
    KOGA Takaaki
■ Papers
■ Other Activities and Achievements
■ Books and other publications
  • 日本熱電学会創立５周年記念 熱電変換技術ハンドブック
    KOGA Takaaki, 第２章第４節１．超格子，Bi2Te3系，PbTe系，GaAs/AlAs系，SiGe系 P249-261
    株式会社 エヌ・ティー・エス, 2008, [Contributor]
  • 環境調和型新材料シリーズ 熱電変換材料，（社）日本セラミックス協会・日本熱電学会［編］
    KOGA Takaaki, 3.2 人工超格子 P193-202
    日刊工業新聞社, 2005, [Contributor]
  • Quantum Wells and Quantum Wires for Potential Thermoelectric Applications
    M. S. Dresselhaus; Y. M. Lin; T. Koga; S. B. Cronin; O. Rabin; M.R. Black; G. Dresselhaus, Vol. 71, pp.1-122
    Semiconductors and Semimetals, 2000, [Joint work]
■ Lectures, oral presentations, etc.
  • Determination of spin-orbit coefficients and application to the spin-filter devices using InGaAs/InAlAs heterostructures
    T. Koga; T. Matsuura; S. Faniel; S. Souma; S. Mineshige; Y. Sekine; H. Sugiyama
    2011 Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices, AWAD 2011, June 29 (Wed)-July 1(Fri), 2011, Legend Hotel, Daejeon, Korea., 29 Jun. 2011, English, Invited oral presentation
    [International presentation]
  • Rashba and Dresselhaus Spin-Orbit Interaction in Semiconductor Quantum Wells and Mesoscopic Spin Transport
    KOGA Takaaki
    Symposium on Surface and Nano Science 2010, January 15(Fri)-18(Mon), 2010 : Shizukuishi, JAPAN, 15 Jan. 2010, English, Invited oral presentation
    [International presentation]
  • Spin interference devices based on the Rashba and Dresselhaus terms
    KOGA Takaaki
    The 4th International Conference on Physics and Application of Spin-Related Phenomena in Semiconductors, PASPS IV, (Sendai, 2006), 2006, English, Invited oral presentation
    [International presentation]
  • Rashba効果を用いたスピン干渉計
    古賀貴亮; 関根佳明; 新田淳作; 俵谷和典; 奥谷洋
    第53回応用物理学関係連合講演会, 2005, Japanese, Invited oral presentation
    [Domestic Conference]
  • 低次元、超格子系熱電材料の現状と展望
    KOGA Takaaki
    熱電変換シンポジウム 2001 (TEC 2001), 08 Aug. 2001, Japanese, Invited oral presentation
    [Domestic Conference]
  • Carrier Pocket Engineering for the Design of Low Dimensional Thermoelectrics With High Z3DT
    T. Koga; S. B. Cronin; M. S. Dresselhaus
    MRS Spring Meeting 2000 (San Francisco), 2000, English, Invited oral presentation
    [International presentation]
■ Affiliated academic society
  • 社団法人 応用物理学会
  • 日本物理学会
  • 米国物理学会
  • The Japan Society of Applied Physics
  • The Physical Society of Japan
  • American Physical Society
■ Works
  • International Symposium on Nanoscale Transport and Technology (ISNTT2011)
    2011
  • 第58回応用物理学関係連合講演会(2011春)
    2011
  • Sixth International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors (PASPS-VI), Hongo Campus, University of Tokyo (2010)
    2010
  • 30th International Conference on the Physics of Semiconductors, ICPS2010 (July 25-30, 2010, COEX, Seoul, Korea )
    2010
  • APS March Meeting 2010 (Portland)
    2010
  • 第15回 半導体スピン工学の基礎と応用 PASPS-15
    2010
  • 日本物理学会 2010年秋季大会
    2010
  • 第29回電子材料シンポジウム
    2010
  • 日本物理学会 第65回年次大会
    2010
  • APS March Meeting 2010 (Portland)
    2010
  • 29th Electronic Materials Symposium (EMS-29)
    2010
  • The 18th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-18)
    2009
  • The 14th International Conference on Modulated Semiconductor Structures
    2009
  • 14th International Conference on Narrow Gap Semiconductors and Systems
    2009
  • APS March Meeting 2009
    2009
  • 日本物理学会 2009年秋季大会
    2009
  • 日本物理学会 第64回年次大会
    2009
  • The 18th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-18)
    2009
  • The 14th International Conference on Modulated Semiconductor Structures
    2009
  • 14th International Conference on Narrow Gap Semiconductors and Systems
    2009
  • APS March Meeting 2009
    2009
  • Fifth International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors (PASPS-V), Foz do Iguacu, Brazil (2008)
    2008
  • APS March Meeting 2008 (New Orleans) (2008)
    2008
  • 第69回応用物理学会学術講演会(2008秋)
    2008
  • 第55回応用物理学関係連合講演会(2008春)
    2008
  • Forth International School and Conference on Spintronics and Quantum Information Technology (SPINTECH IV), MAUI, Hawaii, USA, June 17-22 (2007)
    2007
  • APS March Meeting 2007 (Denver) (2007)
    2007
  • 日本物理学会 第62回年次大会(2007)
    2007
  • 第54回応用物理学関係連合講演会(2007春)
    2007
  • 第54回応用物理学関係連合講演会（2007春）
    2007
  • 28th International Conference on the Physics of Semiconductors, ICPS2006 (Vienna, Austria)
    2006
  • The 4th International Conference on Physics and Application of Spin-Related Phenomena in Semiconductors (Sendai, 2006.8.15-8.18)
    2006
  • APS March Meeting 2006 (Baltimore) (2006)
    2006
  • 日本物理学会 2006年秋季大会（2006）
    2006
  • 第53回応用物理学関係連合講演会(2006春)
    2006
  • 日本物理学会 第61回年次大会(2006)
    2006
  • The 12th International Conference on Narrow Gap Semiconductors, NGS12 (2005).
    2005
  • 第52回応用物理学関係連合講演会(2005春)
    2005
  • The 3rd International Conference on Physics and Applications of Spin Related Phenomena in Semiconductors (2004)
    2004
  • 第65回応用物理学会学術講演会(2004秋)
    2004
  • 日本物理学会 第58回年次大会(2003)
    2004
  • 日本物理学会 第５９回年次大会(2004春)
    2004
  • 11th Int. Conf. on Narrow Gap Semiconductors (Buffalo), Mo-B-3 (2003)
    2003
  • 日本物理学会 2003年秋季大会（2003）
    2003
  • The 23rd International Conference on Low Temperature Physics (2002)
    2002
  • 2nd International Conference on Physics and Application of Spin Related Phenomena in Semiconductors (2002)
    2002
  • 26th International Conference on the Physics of Semiconductors (2002)
    2002
  • APS March Meeting 2002 (Indianapolis) (2002)
    2002
  • 日本物理学会 2002年秋季大会(2002)
    2002
  • 日本物理学会 第57回年次大会(2002)
    2002
  • Materials Research Society, Fall Meeting(2001)
    2001
  • Materials Research Society, Fall Meeting (2001)
    2001
  • 10th International Conference on Modulated Semiconductor Structures (Linz) (2001)
    2001
  • Proceedings of the 10th International Conference on Narrow Gap Semiconductors and Related Small Energy Phenomena (2001)
    2001
  • The 2001 International Conference on SOLID STATE DEVICES AND MATERIALS (Tokyo) (2001)
    2001
  • APS March Meeting 2001 (Seattle) (2001)
    2001
  • 日本物理学会 2001年秋季大会(2001)
    2001
  • 日本物理学会 第56回年次大会(2001)
    2001
  • APS March Meeting 2000 March 20-24 Minneapolis Convention Center (Minneapolis) (2000)
    2000
  • MRS Spring Meeting 2000 (San Francisco) (2000)
    2000
  • 日本物理学会 2000年秋季大会(2000)
    2000
  • Materials Research Society, Fall Meeting (1999)
    1999
  • The 18th International Conference on Thermoelectrics: ICT Symposium Proceedings (1999)
    1999
  • American Physical Society, March Meeting (Atlanta) (1999)
    1999
  • Materials Research Society, Fall Meeting (1998)
    1998
  • Materials Research Society, Fall Meeting (1997).
    1997
  • Materials Research Society, Fall Meeting (1996)
    1996
  • THE 1993 IEEE International Magnetics Conference, Stockholm, Sweden（1993）
    1993
  • Proceedings of the 3rd IUMRS International Conference on Advanced Materials (1993)
    1993
  • NATO ASI Meeting, Badwingsheim, Germany.(1992)
    1992
  • The 4th International Symposium on Superconductivity, Tokyo(1991)
    1991
  • The 4th International Symposium on Superconductivity(1991)
    1991
■ Research Themes
  • 二重量子井戸を用いた非磁性半導体スピンフィルタの研究
    共同研究費
    May 2012 - Feb. 2013
    SUEOKA Kazuhisa
    日本電信電話株式会社NTT物性科学基礎研究所, Competitive research funding
  • 半導体スピントロニクスにおけるスピン軌道相互作用を利用したスピンフィルタの研究
    共同研究費
    Sep. 2011 - Feb. 2012
    KOGA Takaaki
    日本電信電話株式会社NTT物性科学基礎研究所, Principal investigator, Competitive research funding
  • Confirmation of Mesoscopic Spin Transport in InGaAs Quantum Wells
    Grants-in-Aid for Scientific Research
    2011 - 2012
    KOGA Takaaki; KAWABATA Shiro; SOUMA Satofumi; SAITO Keiji; MATSUURA Toru
    For InP-lattice-matched InGaAs quantum wells, we have quantitatively revealed the zero-field spin splitting term. Not only in showing the presence of the Rashba term for the first time which has been the target of controversy for long time, but also we have succeeded in elucidating its size quantitatively. More specifically, we have shown for the first time the linear relation between the Rashba coefficient alpha and the electric field inside the well from the theoretical analysis of the weak antilocalization effect that is seen in the magneto-conductivity data at dilution temperatures. In addition, we have found that the Dresselhaus term in this system is very small. Finally, we have also measured the time-reversal quantum interference effect in a mesoscopic loop array structure that is fabricated in a wafer whose can be varied across zero by gate and demonstrated the effectiveness of the semi-classical approach in theory.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, Competitive research funding, 23360001
  • 半導体スピントロニクスにおける界面電場と結晶場の電子スピンに与える影響評価の研究
    共同研究費
    Jun. 2010 - Mar. 2011
    KOGA Takaaki
    日本電信電話株式会社NTT物性科学基礎研究所, Principal investigator, Competitive research funding
  • 半導体へテロ界面場による電子スピン制御技術の確立とスピントロニクス応用
    創成科学機構 研究部 流動研究部門
    Oct. 2006 - Mar. 2011
    KOGA Takaaki
    国立大学法人 北海道大学, Principal investigator, Competitive research funding
  • 半導体スピントロニクスにおける電子スピン制御の研究
    共同研究費
    Oct. 2009 - Feb. 2010
    KOGA Takaaki
    日本電信電話株式会社NTT物性科学基礎研究所, Principal investigator, Competitive research funding
  • Quantitative investigation of the zero-field spin splitting in semiconductor quantum wells and its application to mesoscopic physics
    Grants-in-Aid for Scientific Research(若手研究(A))
    2007 - 2010
    Takaaki KOGA
    Spin-orbit interaction in semiconductor can be considered as a fundamental principle on which next generation electronics, such as quantum information devices, are based. In this research, we chose the In_<0.53>Ga_<0.47>As/In_<0.52>Al_<0.48>As quantum well system as a standard material for spintronics and revealed the spin-orbit parameters quantitatively by electron transport measurements at low temperatures including spin interference effect.
    Ministry of Education, Culture, Sports, Science and Technology, 若手研究(A), 北海道大学, Principal investigator, Competitive research funding, 19684009
  • スピン軌道相互作用を用いた半導体量子情報素子の開発
    研究費助成
    Jun. 2006 - May 2009
    KOGA Takaaki
    (財)テレコム先端技術研究支援センター, Principal investigator, Competitive research funding
  • 狭ギャップ半導体量子細線の作製とスピン軌道相互作用に基づく異常磁化発現
    Apr. 2007 - Mar. 2008
    KOGA Takaaki
    （財）池谷科学技術振興財団, Principal investigator, Competitive research funding
  • スピン制御半導体の研究
    受託研究費
    Apr. 2005 - Mar. 2008
    KOGA Takaaki
    日本電信電話株式会社NTT物性科学基礎研究所, Principal investigator, Competitive research funding
  • 半導体スピンエンジニアリング
    CREST (分担)
    Apr. 2005 - Mar. 2007
    NITTA Junsaku
    (独)科学技術振興機構, Competitive research funding
  • 半導体ナノ構造中でのスピン軌道相互作用を用いた､スピン輸送､スピン干渉､スピン操作の研究
    研究助成
    Aug. 2005 - Jul. 2006
    KOGA Takaaki
    (財)村田学術振興財団, Principal investigator, Competitive research funding
  • 量子コンピュータ実現に向けた半導体スピン干渉デバイスの研究
    研究助成金
    Apr. 2005 - Mar. 2006
    KOGA Takaaki
    （財）稲森財団, Principal investigator, Competitive research funding
  • GaAs/AlGaAs界面による電子スピン制御の検討
    戦略的創造研究推進事業 特別課題調査
    2006 - 2006
    KOGA Takaaki
    (独)科学技術振興機構, Principal investigator, Competitive research funding
  • 半導体ナノ構造中に現れる新スピン物性の制御と応用
    さきがけ研究 ナノと物性領域
    Dec. 2001 - Mar. 2005
    KOGA Takaaki
    （独）科学技術振興機構, Principal investigator, Competitive research funding
■ Industrial Property Rights
  • スピン検出器およびスピン検出方法
    Patent right, 関根佳明; 赤崎達志; 古賀貴亮; 末岡和久
    特願2013-015190, 30 Jan. 2014
  • スピン素子
    Patent right, 古賀貴亮; 関根佳明
    特願2012-096287, 2012
  • スピン偏極装置
    Patent right, 古賀貴亮; 関根佳明
    特願2010-189336, 2010
  • スピン偏極装置
    Patent right, 古賀貴亮; 関根佳明
    特願2010-161379, 2010
  • スピンフィルター装置
    Patent right, 古賀貴亮; 新田淳作
    特願2002-329500, 2002
    特開2004-165426, 2004
  • 超格子熱電材料
    Patent right, 古賀貴亮; 渡辺正裕
    特願2002-356574, 2002
    特開2004-193200, 2004
  • スピンフィルター
    Patent right, 古賀貴亮; 新田淳作
    特願2002-329648, 2002
    特開2004-165438, 2004
  • Superlattice Structures Having Selected Carrier Pockets and Related Methods
    Patent right, T. Koga; M. S. Dresselhaus; X. Sun; S. B. Cronin
    特許U.S. Patent No. 6,627,809
    30 Sep. 2003
  • 半導体スピンフィルター
    Patent right, 古賀貴亮; 新田淳作; 赤崎達志; 高柳英明
    特願2001-149376, 2001
    特開2002-343958, 2002
  • Si/SiGe Superlattice Structures for Use in Thermoelectric Devices
    Patent right, M. S. Dresselhaus; T. C. Harman; S. B. Cronin; T. Koga; X. Sun; K. L. Wang
    特許U.S. Patent No. 6,060,656
    09 May 2000

Research Profiles

■ Research Profiles