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Study of photo-induced electron spin transfer with time-resolved micro Kerr rotation measurement under low temperature and high magnetic field

Research Project

Project/Area Number 24540315
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics I
Research InstitutionChiba University

Principal Investigator

MINO Hirofumi  千葉大学, 普遍教育センター, 准教授 (40323430)

Co-Investigator(Renkei-kenkyūsha) OTO Kenichi  千葉大学, 理学研究科, 教授 (30263198)
TSUCHIYA Takuma  北海道大学, 工学研究科, 准教授 (40262597)
Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords光誘起スピン偏極 / スピンイメージング / 半導体量子井戸 / スピン緩和 / 光電流 / スピン偏極 / 光誘起カー回転 / 二次元電子ガス
Outline of Final Research Achievements

To observe the spatial and temporal behavior of photo-created electron spins, we developed pump-probe micro-Kerr rotation measurement system, which has 1μm spatial resolution, 100μm x 100μm scanning region, high sensitivity spin detection under several μW laser excitation. Photocurrent measurements were also made possible in this system. In ZnSe/BeTe quantum wells, not only the Dresselhaus effect but also another effect is found to be necessary to explain the anisotropic spin propagation. In CdMnTe quantum wells the suppression of the photo-induced exciton spin precession, which means the effective g-factor is zero, was observed at critical temperature. This result was well explained by the competition between the exciton Zeeman effect and exciton-Mn exchange interaction. The spin lifetime indicated intensive increase above the critical temperature. In (BEDT-TTF)(TCNQ) crystals the suppression of photogenerated carrier conduction was observed below the antiferromagnetic transition.

Report

(4 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • Research Products

    (5 results)

All 2014 2013 2012

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Acknowledgement Compliant: 1 results) Presentation (4 results)

  • [Journal Article] Photocurrent suppression near antiferromagnetic transition in an organic Mott-insulator β′-(BEDT-TTF)(TCNQ) crystal2014

    • Author(s)
      T. Ginoza, T. Shinohara, M. Sakai and H. Mino
    • Journal Title

      Physica status solidi (b)

      Volume: 251 Issue: 6 Pages: 1248-1251

    • DOI

      10.1002/pssb.201350409

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] CdTe/Cd1-xMnxTe量子井戸における光誘起励起子スピン歳差運動の観測2014

    • Author(s)
      上村翔太,伊達晃良,中嶋誠,三野弘文
    • Organizer
      第69回年次大会日本物理学会
    • Place of Presentation
      東海大学湘南キャンパス
    • Related Report
      2013 Research-status Report
  • [Presentation] CdTe/Cd1-XMnXTe量子井戸における光誘起時間分解Kerr回転2013

    • Author(s)
      伊達晃良,三野弘文
    • Organizer
      第24回光物性研究会
    • Place of Presentation
      大阪市立大学杉本キャンパス
    • Related Report
      2013 Research-status Report
  • [Presentation] 有機モット絶縁体β’-(BEDT-TTF)(TCNQ)結晶における光電流特性2013

    • Author(s)
      宜野座智理,三野弘文,酒井正俊
    • Organizer
      第24回光物性研究会
    • Place of Presentation
      大阪市立大学杉本キャンパス
    • Related Report
      2013 Research-status Report
  • [Presentation] 光ヘテロダイン検波を用いた顕微Kerr回転計測システムの開発2012

    • Author(s)
      三野弘文
    • Organizer
      第23回光物性研究会
    • Place of Presentation
      大阪市立大学
    • Related Report
      2012 Research-status Report

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Published: 2013-05-31   Modified: 2020-05-15  

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