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電子スピンのコヒーレント初期化の研究

Publicly Offered Research

Project AreaQuantum cybernetics - interdisciplinary studies of quantum controls and developments toward quantum computing
Project/Area Number 24102702
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionUniversity of Tsukuba

Principal Investigator

舛本 泰章  筑波大学, 名誉教授 (60111580)

Project Period (FY) 2012-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
Fiscal Year 2013: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2012: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
KeywordsZnO / 電子スピン / トリオン / 時間分解カー回転 / コヒーレント初期化
Research Abstract

<ZnO:Gaのトリオン共鳴カー回転>
核スピンがゼロになる核の自然存在比が大きいため長いスピン緩和時間T2*=12nsを持つZnO薄膜中のGaドナー(濃度6×1017cm-3)により与えられた局在電子からトリオンを生成する共鳴励起によるスピン初期化の過程を調べた。すでにフェムト秒時間分解カー回転測定法では共鳴スピン増幅を用いて長い緩和時間T2*=12nsを精度よく求めたが、スペクトル幅が0.2meVと狭いピコ秒パルス(2ps)を使った時間分解カー回転測定法を用いて、A励起子の低エネルギー側の裾でレーザーエネルギーを変えてカー回転を調べると、A励起子とD0X共鳴エネルギー近傍で電子のカー回転信号(磁場0.5Tのとき周期74ps)が符号を変えながら増強される。特にD0X共鳴エネルギー近傍では、D0Xの発光ピークおよびその2meV-4meVほど低エネルギーでも電子のカー回転信号が増強される。さらにD0X共鳴エネルギー近傍では、120fsの時間分解カー回転測定法で全く見えなかった電子の才差運動以外の微細な振動構造(周期19ps)がカー回転信号の立ち上がり部分に観測された。
<CdS量子ドットの電荷移動とスピンディフェージング>
高効率量子ドット太陽電池においては極めて重要な要素であるCdS量子ドット(平均直径=2.8nm)から電子輸送TiO2ナノ粒子や正孔輸送ポリマー分子への高速電荷移動を、室温で時間分解ファラディ回転を用いて異なるg因子を持つ電子、正孔や励起子による信号を分離してスピン歳差運動とディフェージングを測定した。時間分解ファラディ回転信号はg=1.95の局在電子の歳差運動がもたらす減衰振動成分と正孔・励起子のg因子の異方性がもたらす非振動成分からなり、室温でT2*=0.35nsの量子ドット集団にある局在電子のスピンディフェージングと正孔輸送ポリマーへの正孔が少しゆっくり移動しているのが観測された。

Current Status of Research Progress
Reason

25年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

25年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • Research Products

    (31 results)

All 2014 2013 2012 Other

All Journal Article (14 results) (of which Peer Reviewed: 14 results) Presentation (15 results) (of which Invited: 2 results) Remarks (2 results)

  • [Journal Article] Ultrafast carrier dynamics in CuInS_2 quantum dots2014

    • Author(s)
      Jianhui Sun, Dehua Zhu, Jialong Zhao, Michio Ikezawa, Xiuying Wang, Yasuaki Masumoto
    • Journal Title

      Applied Physics Letters

      Volume: 104 Issue: 2

    • DOI

      10.1063/1.4862274

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Single Photon Generation from an Impurity Center with Well-Defined Emission Energy in GaAs2013

    • Author(s)
      L. Zhang, M. Ikezawa, T. Mori, S. Umehara, Y. Sakuma, K. Sakoda, and Y. Masumoto
    • Journal Title

      Jpn. J. Appl. Phys.

      Volume: Vol.52 Issue: 4S Pages: 04CG11-04CG11

    • DOI

      10.7567/jjap.52.04cg11

    • NAID

      210000142068

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Photoinduced Charge Separation and Recombination Processes in CdSe Quantum Dot and Graphene Oxide Composites with Methylene Blue as Linker2013

    • Author(s)
      Pengtao Jing, Wenyu Ji, Xi Yuan, Michio Ikezawa, Ligong Zhang, Haibo Li, Jialong Zhao, Yasuaki Masumoto
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 4 Issue: 17 Pages: 2919-2925

    • DOI

      10.1021/jz401460j

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 量子ドットのスピン緩和2013

    • Author(s)
      舛本泰章
    • Journal Title

      固体物理

      Volume: 48 Pages: 485-496

    • NAID

      40019847176

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fast Electron Transfer from PbSe Quantum Dots to TiO_22013

    • Author(s)
      Yasuaki Masumoto, Hayato Takagi, Hikaru Umino, Eri Suzumura
    • Journal Title

      AIP Conference Procceedings

      Volume: 1566 Pages: 520-521

    • DOI

      10.1063/1.4848514

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fourier Spectroscopy of Individual Nitrogen Impurity Centers in GaAs2013

    • Author(s)
      Michio Ikezawa, Liao Zhang, Yoshiki Sakuma, Tatsuya Mori, Kazuaki Sakoda, Yasuaki Masumoto
    • Journal Title

      AIP Conference Proceedings

      Volume: 1566 Pages: 544-545

    • DOI

      10.1063/1.4848526

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Bimolecular interlayer scattering of electrons in InP/InAs/InP core-multishell nanowires2013

    • Author(s)
      Y. Masumoto, K. Goto, S. Tomimoto, P. Mohan, J. Motohisa, T. Fukui
    • Journal Title

      JOURNAL OF LUMINESCENCE

      Volume: 133 Pages: 135-137

    • DOI

      10.1016/j.jlumin.2011.09.036

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Coherence of an electron spin in quantum dots generated by a resonant optical pulse with elliptic polarization2013

    • Author(s)
      Shinichi Tomimoto, Keisuke Kawana, Akira Murakami, Yasuaki Masumoto
    • Journal Title

      Journal of Luminescence

      Volume: 133 Pages: 162-168

    • DOI

      10.1016/j.jlumin.2011.09.047

    • NAID

      120007137099

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Shell-thickness-dependent photoinduced electron transfer from CuInS_2/ZnS quantum dots to TiO_2 films2013

    • Author(s)
      Jianhui Sun, Jialong Zhao, Yasuaki Masumoto
    • Journal Title

      Applied Physics Letters

      Volume: 102 Issue: 5

    • DOI

      10.1063/1.4790603

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fast Electron Transfer from PbSe Quantum Dots to TiO22013

    • Author(s)
      Yasuaki Masumoto, Hayato Takagi, Hikaru Umino, Eri Suzumura
    • Journal Title

      31th International Conference on the Physics of Semiconductors (ICPS2012) Proceeding

      Volume: 印刷中

    • NAID

      120007137272

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fourier Spectroscopy of Individual Nitrogen Impurity Centers in GaAs2013

    • Author(s)
      Michio Ikezawa, Liao Zhang, Yoshiki Sakuma, Tatsuya Mori, Kazuaki Sakoda, Yasuaki Masumoto
    • Journal Title

      31th International Conference on the Physics of Semiconductors (ICPS2012) Proceeding

      Volume: 印刷中

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fast electron transfer from PbSe quantum dots to TiO_22012

    • Author(s)
      Yasuaki Masumoto, Hayato Takagi, Hikaru Umino, Eri Suzumura
    • Journal Title

      Applied Physics Letters

      Volume: 100 Issue: 25

    • DOI

      10.1063/1.4729881

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Size- and Composition-Dependent Energy Transfer from Charge Transporting Materials to ZnCuInS Quantum Dots2012

    • Author(s)
      Xi Yuan, Jialong Zhao, Pengtao Jing, Wenjin Zhang, Haibo Li, Ligong Zhang, Xinhua Zhong, Yasuaki Masumoto
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 116 Issue: 22 Pages: 11973-11979

    • DOI

      10.1021/jp3037236

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Influence of optical coherence on the electron spin in singly-charged InP quantum dots excited by resonant laser pulses2012

    • Author(s)
      Shinichi Tomimoto, Keisuke Kawana, Akira Murakami, Yasuaki Masumoto
    • Journal Title

      Physical Review B

      Volume: 85 Issue: 23

    • DOI

      10.1103/physrevb.85.235320

    • NAID

      120007137271

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Presentation] Shell Thickness Dependent Photoinduced Electron Transfer from CuInS2/ZnS quantum dots to TiO2 films2013

    • Author(s)
      Jianhui Sun,Jialong Zhao,Yasuaki Masumoto
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学
    • Year and Date
      2013-03-28
    • Related Report
      2012 Annual Research Report
  • [Presentation] 量子ドットのスピン緩和2013

    • Author(s)
      舛本泰章
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学
    • Year and Date
      2013-03-27
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] 超コヒーレントな単一光子発生のための単一発光中心の共鳴励起2013

    • Author(s)
      森達哉,池沢道男,張遼,佐久間芳樹,迫田和彰,舛本泰章
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学
    • Year and Date
      2013-03-27
    • Related Report
      2012 Annual Research Report
  • [Presentation] GaAs:N中の単一不純物発光中心のフーリエ分光測定2013

    • Author(s)
      張遼,池沢道男,森達哉,佐久間芳樹,迫田和彰,舛本泰章
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学
    • Year and Date
      2013-03-27
    • Related Report
      2012 Annual Research Report
  • [Presentation] ZnO薄膜中のGa不純物に束縛された電子のスピン緩和2012

    • Author(s)
      村上瑛,冨本慎一,加藤裕幸,佐野道宏,松本貴裕,舛本泰章
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      横浜国立大学
    • Year and Date
      2012-09-20
    • Related Report
      2012 Annual Research Report
  • [Presentation] GaAs:N中の発光エネルギーが揃った発光中心から単一光子の発生2012

    • Author(s)
      張遼,池沢道男,森達哉,梅原晋太郎,佐久間芳樹,迫田和彰,舛本泰章
    • Organizer
      第73回応用物理学会学術講演会
    • Place of Presentation
      松山大学
    • Year and Date
      2012-09-12
    • Related Report
      2012 Annual Research Report
  • [Presentation] ZnO薄膜中のGaドナーに束縛された電子スピン緩和時間の計測2012

    • Author(s)
      村上瑛,冨本慎一,加藤裕幸,佐野道宏,松本貴裕,舛本泰章
    • Organizer
      第73回応用物理学会学術講演会
    • Place of Presentation
      愛媛大学
    • Year and Date
      2012-09-11
    • Related Report
      2012 Annual Research Report
  • [Presentation] Fast Electron Transfer from PbSe Quantum Dots to TiO22012

    • Author(s)
      Yasuaki Masumoto, Hayato Takagi, Hikaru Umino, Eri Suzumura
    • Organizer
      31th International Conference on the Physics of Semiconductors (ICPS2012)
    • Place of Presentation
      スイス連邦工科大学,スイス
    • Year and Date
      2012-08-02
    • Related Report
      2012 Annual Research Report
  • [Presentation] Fourier Spectroscopy of Individual Nitrogen Impurity Centers in GaAs2012

    • Author(s)
      Michio Ikezawa, Liao Zhang, Yoshiki Sakuma, Tatsuya Mori, Kazuaki Sakoda, Yasuaki Masumoto
    • Organizer
      31th International Conference on the Physics of Semiconductors (ICPS2012)
    • Place of Presentation
      スイス連邦工科大学,スイス
    • Year and Date
      2012-08-02
    • Related Report
      2012 Annual Research Report
  • [Presentation] GaAs中の単一窒素発光中心の共鳴蛍光

    • Author(s)
      張遼,池沢道男,佐久間芳樹,迫田和彰,舛本泰章
    • Organizer
      日本物理学会第69回年次大会
    • Place of Presentation
      東海大学(神奈川県)
    • Related Report
      2013 Annual Research Report
  • [Presentation] CdS量子ドットの電荷移動とスピンディフェージング

    • Author(s)
      海野晃,舛本泰章
    • Organizer
      日本物理学会第69回年次大会
    • Place of Presentation
      東海大学(神奈川県)
    • Related Report
      2013 Annual Research Report
  • [Presentation] Ultrafast carrier dynamics in CuInS2 quantum dots

    • Author(s)
      Jianhui Sun,Jialong Zhao,Yasuaki Masumoto
    • Organizer
      日本物理学会第69回年次大会
    • Place of Presentation
      東海大学(神奈川県)
    • Related Report
      2013 Annual Research Report
  • [Presentation] 単一発光中心の共鳴励起による単一光子発生

    • Author(s)
      池沢道男,張遼,佐久間芳樹,迫田和彰,舛本泰章
    • Organizer
      第61回応用物理学会春季学術講演会
    • Place of Presentation
      青山学院大学(神奈川県)
    • Related Report
      2013 Annual Research Report
  • [Presentation] Fast electron transfer from small PbSe quantum dots to TiO2

    • Author(s)
      Yasuaki Masumoto, Hayato Takagi, Hikaru Umino, Eri Suzumura
    • Organizer
      18th International Conference on Dynamical Processes in Excited States of Solids
    • Place of Presentation
      Fuzhou, China
    • Related Report
      2013 Annual Research Report
  • [Presentation] Fast charge transfer from quantum dots for solar cells

    • Author(s)
      Yasuaki Masumoto
    • Organizer
      1st International Conference on Nano-Bio-Medicine Convergence (NBMC-2014)
    • Place of Presentation
      Pusan National University, Korea
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Remarks] 舛本・池沢研究室ホームページ

    • URL

      http://www.px.tsukuba.ac.jp/~kezawa/lab/

    • Related Report
      2013 Annual Research Report
  • [Remarks] 舛本・池沢研究室webページ

    • URL

      http://www.px.tsukuba.ac.jp/~ikezawa/lab/

    • Related Report
      2012 Annual Research Report

URL: 

Published: 2013-05-15   Modified: 2019-07-29  

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