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Elucidation and control of valley physics in atomically thin materials

Research Project

Project/Area Number 17H06786
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Condensed matter physics I
Research InstitutionKyoto University

Principal Investigator

Shinokita Keisuke  京都大学, エネルギー理工学研究所, 特定助教 (60806446)

Project Period (FY) 2017-08-25 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords原子層物質 / バレートロニクス / 遷移金属ダイカルコゲナイド / 励起子 / ナノ光科学 / 光物性 / ナノ材料 / 半導体物性
Outline of Final Research Achievements

Valley degrees of freedom of electrons and holes has recently attracted much interest in fundamental and applied research areas because of novel phenomena and their potential for next generation electronics device with high speed operation (valleytronics). This study focuses on elucidation and control of valley relaxation mechanism in monolayer transition metal dichalcogenides (MX2, M=Mo, W, X=S, Se) in which valley and spin degrees of freedom are coupled. By using device structure fabrication and spectroscopic technique, we obtained deep understanding of relaxation mechanism of valley polarized state and demonstrated proof of principle to achieve high valley polarization, which holds potential for novel valleytronics devices.

Academic Significance and Societal Importance of the Research Achievements

本研究では、これまで未解明であった中性励起子のバレー分極率の緩和メカニズムを完全に解明し、バレー分極率を制御する新たな方法を実証した。また、荷電励起子のバレー分極状態の包括的な緩和ダイナミクスを明らかにした。これにより、荷電励起子のバレー分極状態緩和メカニズムの理論的な研究を推進して、将来のバレートロニクスデバイスの実現に向けての新たな知見を集積することができた。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • Research Products

    (19 results)

All 2019 2018 2017

All Journal Article (9 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 9 results) Presentation (10 results)

  • [Journal Article] Continuous Control and Enhancement of Excitonic Valley Polarization in Monolayer WSe 2 by Electrostatic Doping2019

    • Author(s)
      Shinokita Keisuke、Wang Xiaofan、Miyauchi Yuhei、Watanabe Kenji、Taniguchi Takashi、Matsuda Kazunari
    • Journal Title

      Advanced Functional Materials

      Volume: - Issue: 26 Pages: 1900260-1900260

    • DOI

      10.1002/adfm.201900260

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Planar Perovskite Solar Cells with High Efficiency and Fill Factor Obtained Using Two-Step Growth Process2019

    • Author(s)
      Yang Fengjiu、Liu Jiewei、Wang Xiaofan、Tanaka Kenya、Shinokita Keisuke、Miyauchi Yuhei、Wakamiya Atsushi、Matsuda Kazunari
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 11 Issue: 17 Pages: 15680-15687

    • DOI

      10.1021/acsami.9b02948

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Direct and Indirect Exciton Dynamics in Few‐Layered ReS2 Revealed by Photoluminescence and Pump‐Probe Spectroscopy2018

    • Author(s)
      X. Wang, K. Shinokita, H.E. Lim, N. B. Mohamed, Y. Miyauchi, N.T. Cuong, S. Okada, K. Matsuda
    • Journal Title

      Advanced Functional Materials

      Volume: 29 Issue: 6 Pages: 1806169-1806169

    • DOI

      10.1002/adfm.201806169

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Photoluminescence quantum yields for atomically thin-layered ReS2: Identification of indirect-bandgap semiconductors2018

    • Author(s)
      N. B. Mohamed, K. Shinokita, X. Wang, H-E. Lim, D. Tan, Y. Miyauchi, K. Matsuda
    • Journal Title

      Applied Physics Letters

      Volume: 113 Issue: 12 Pages: 121112-121112

    • DOI

      10.1063/1.5037116

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] High Bending Durability of Efficient Flexible Perovskite Solar Cells Using Metal Oxide Electron Transport Layer2018

    • Author(s)
      F. Yang, J. Liu, H-E. Lim, Y. Ishikura, K. Shinokita, Y. Miyauchi, A. Wakamiya, Y. Murata, K. Matsuda
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 122 Issue: 30 Pages: 17088-17095

    • DOI

      10.1021/acs.jpcc.8b05008

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Efficient Photocarrier Transfer and Effective Photoluminescence Enhancement in Type I Monolayer MoTe2/WSe2 Heterostructure2018

    • Author(s)
      T. Yamaoka, H-E. Lim, S. Koirala, K. Shinokita, M. Maruyama, S. Okada, Y. Miyauchi, K. Matsuda
    • Journal Title

      Advanced Functional Materials

      Volume: 28 Issue: 35 Pages: 1801021-1801021

    • DOI

      10.1002/adfm.201801021

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Carrier Transport and Photoresponse in GeSe/MoS2 Heterojunction p-n Diodes2018

    • Author(s)
      Tan Dezhi、Wang Xiaofan、Zhang Wenjin、Lim Hong En、Shinokita Keisuke、Miyauchi Yuhei、Maruyama Mina、Okada Susumu、Matsuda Kazunari
    • Journal Title

      Small

      Volume: - Issue: 22 Pages: 1704559-1704559

    • DOI

      10.1002/smll.201704559

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Long radiative lifetimes of excitons in monolayer transition-metal dichalcogenides MX2 (M = Mo, W; X = S, Se)2018

    • Author(s)
      N. B. Mohamed, H. E. Lim, F. Wang, S. Koirala, S. Mouri, K. Shinokita, Y. Miyauchi, and K. Matsuda
    • Journal Title

      Applied Physics Express

      Volume: 11 Issue: 1 Pages: 015201-015201

    • DOI

      10.7567/apex.11.015201

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Roles of Polymer Layer in Enhanced Photovoltaic Performance of Perovskite Solar Cells via Interface Engineering2017

    • Author(s)
      Yang Fengjiu、Lim Hong En、Wang Feijiu、Ozaki Masashi、Shimazaki Ai、Liu Jiewei、Mohamed Nur Baizura、Shinokita Keisuke、Miyauchi Yuhei、Wakamiya Atsushi、Murata Yasujiro、Matsuda Kazunari
    • Journal Title

      Advanced Materials Interfaces

      Volume: 5 Issue: 3 Pages: 1701256-1701256

    • DOI

      10.1002/admi.201701256

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] 二次元遷移金属ダイカルコゲナイドにおけるバレー分極の制御2019

    • Author(s)
      篠北 啓介, 王 暁凡, 宮内 雄平, 松田 一成
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] UV光照射に伴う超酸分子処理MoS2のフォトルミネッセンスの連続的上昇2019

    • Author(s)
      山田悠貴, 青木佑樹, 福井暁人, 一宮永, 吉村武,芦田淳,藤村紀文,篠北啓介, 松田一成, 桐谷乃輔
    • Organizer
      第66回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Enhancement of Excitonic Valley Polarization by Carrier Doping in Monolayer WSe22019

    • Author(s)
      篠北 啓介, 王 暁凡, 宮内 雄平, 渡邊 賢司, 谷口 尚, 松田 一成
    • Organizer
      第56回 フラーレン・ナノチューブ・グラフェン 総合シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] Charged exciton (trion) in anisotropic atomically thin 2D material ReS22019

    • Author(s)
      王 暁凡, 篠北 啓介, 宮内 雄平, 松田 一成
    • Organizer
      第56回 フラーレン・ナノチューブ・グラフェン 総合シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] 超高速分光法を用いた3層ReS2におけるキャリアダイナミクス2018

    • Author(s)
      王 暁凡, 篠北 啓介, 林 宏恩, モハメッド ヌル バイズラ, 宮内 雄平, 松田 一成
    • Organizer
      第54回 フラーレン・ナノチューブ・グラフェン 総合シンポジウム
    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
  • [Presentation] 超高速分光手法を用いた単層WSe2におけるバレー緩和2018

    • Author(s)
      篠北 啓介, 王 暁凡, 宮内 雄平, 松田 一成
    • Organizer
      第54回 フラーレン・ナノチューブ・グラフェン 総合シンポジウム
    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
  • [Presentation] 単層WSe2における電子正孔バレー分極緩和過程2018

    • Author(s)
      篠北 啓介, 王 暁凡, 宮内 雄平, 松田 一成
    • Organizer
      第73回物理学会年次大会
    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
  • [Presentation] Doping Control of Valley Depolarization of Neutral Exciton in Monolayer WSe22018

    • Author(s)
      Keisuke Shinokita、Xiaofan Wang、Yuhei Miyauchi、Kazunari Matsuda
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 単層WSe2におけるトリオンバレー分極緩和ダイナミクス2018

    • Author(s)
      篠北 啓介, 王 暁凡, 宮内 雄平, 松田 一成
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 単層WSe2における電子-正孔バレー分極緩和過程2017

    • Author(s)
      篠北 啓介, 王 暁凡, 宮内 雄平, 松田 一成
    • Organizer
      第28回光物性研究会
    • Related Report
      2017 Annual Research Report

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Published: 2017-08-25   Modified: 2020-03-30  

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