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Multi-dimensional imaging of photo-injected holes by means of time- and angle-resolved photoelectron difference spectroscopy

Research Project

Project/Area Number 19H01826
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionOsaka Metropolitan University (2022)
Osaka City University (2019-2021)

Principal Investigator

Kanasaki Jun'ichi  大阪公立大学, 大学院工学研究科, 教授 (80204535)

Co-Investigator(Kenkyū-buntansha) 東 純平  佐賀大学, シンクロトロン光応用研究センター, 准教授 (40372768)
深津 晋  東京大学, 大学院総合文化研究科, 教授 (60199164)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Keywords半導体 / 光励起 / キャリアダイナミクス / 正孔動力学 / 時間角度分解光電子分光法 / 光電子差分分光法 / フェムト秒レーザー / 超高速緩和現象 / キャリア動力学 / 2光子光電子分光 / 電子・正孔 / シリコン / ゲルマニウム / III-V族半導体 / 正孔 / 励起電子 / 光電子分光 / 発光分光 / 2光子光電子分光 / 角度分解光電子分光 / ポンプ・プローブ法
Outline of Research at the Start

半導体の物性やデバイス機能の発現において、伝導帯励起電子系と同様に価電子正孔系の役割は重要であるが、これまでその動的挙動を直接観察する手法が存在しなかった。本研究では、代表者らが開発した時間・角度分解光電子差分分光の手法と、佐賀大学が所有する光電子軌道制御多次元イメージング装置を融合し、励起電子系と正孔系密度分布の緩和過程を、時間・エネルギー・運動量の多次元空間において解明する。更に、光電子分光イメージと電子正孔再結合に伴う発光スペクトルを時間分解的に同時測定する事により、励起直後から再結合に至るまでの励起キャリア系の緩和過程を、電子系と正孔系の両面から、総合的かつ統一的に明らかにする。

Outline of Final Research Achievements

Time- and angle-resolved two-photon photoelectron (2PPE) spectroscopy has elucidated the ultrafast dynamics of excited electrons in the energy- and momentum-spaces On the other hand, our knowledge of the relaxation dynamics of holes injected in the valence band has been limited. In this project, the time- and angle-resolved photoelectron differential spectroscopy was used to investigate the ultrafast dynamics of valence holes in silicon, where holes are injected in the valence band by 1.48-eV pump laser pulses and then 5.92-eV laser light was used to eject photoelectrons via resonant direct transitions between the valence states and free electron-like states located above the vacuum level. Based on the experimental results on the temporal change of photoelectron images together with calculated results, we have elucidated ultrafast population dynamics of photoinjected electrons and holes in photoexcited semiconductors.

Academic Significance and Societal Importance of the Research Achievements

半導体を光励起すると、伝導帯に励起電子系、価電子帯に正孔系の非平衡分布が形成される。これら励起キャリア系は、エネルギー・運動量空間において種々の散乱過程を経て、バンド端まで緩和し、最終的には再結合等を介して消滅する。励起キャリア系の緩和現象は、非平衡量子多体系の動的振る舞いが顕著に現れる典型的な物理現象であり、学術的に重要である。更に、本研究課題の内容は、半導体物質における電荷輸送・熱輸送・発光・スピン伝導といった基礎的特性、光誘起構造変化・光触媒といった励起誘起現象等にも直接的・間接的に関与しており、その全貌の解明は広い産業分野において波及効果が大きく、極めて重要である。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (18 results)

All 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (11 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Int'l Joint Research] Ecole Polytechnique(フランス)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Ecole Polytechnique(フランス)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Ecole Polytechnique(フランス)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Optical film-thinning of few-layer graphene epitaxially grown on 4H-SiC(0001) surface : Robustness of monolayer-graphene against the photoexcitation2023

    • Author(s)
      R. Horie, R. Hirosue, J. Kanasaki, K. Kisoda, I. Yamamoto, J. Azuma, K. Takahashi
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 35 Issue: 19 Pages: 195401-195401

    • DOI

      10.1088/1361-648x/acbffc

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Surface exciton formation on InP(110)-(1x1) studied by time- and angle-resolved photoemission spectroscopy2023

    • Author(s)
      H. Tanimura, K. Tanimura, J. Kanasaki
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 7

    • DOI

      10.1103/physrevb.107.075304

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ultrafast dynamics of photoinjected electrons at the nonthermal regime in the intra Γ-valley relaxation in InP studied by time- and angle- resolved photoemission spectroscopy2022

    • Author(s)
      K. Tanimura, K. Tanimura, J. Kanasaki
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 12

    • DOI

      10.1103/physrevb.106.125204

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ultrafast relaxation of photoinjected nonthermal electrons in the valley of GaAs studied by time- and angle-resolved photoemission spectroscopy2021

    • Author(s)
      H. Tanimura, K. tanimura, J. Kanasaki
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 24

    • DOI

      10.1103/physrevb.104.245201

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Spectroscopic studies of laser-induced structural modifications of graphene layers epitaxially-grown on SiC(0001)2022

    • Author(s)
      R. Horie, R. Hirosue, J. Kanasaki, K. Kisoda, I. Yamamoto, J. Azuma, K. Takahashi
    • Organizer
      The 22nd International Vacuum Congress (IVC-22)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] SiC(0001)上グラフェンにおける光誘起構造変化2022

    • Author(s)
      廣末龍一、堀江亮介、金﨑順一、木曽田賢治、山本勇、東純平、高橋正敏
    • Organizer
      第83回応用物理学会秋季学術講演大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 光学的にとらえたGe中の非平衡電子の超高速緩和過程とそれにともなう特異な物性2022

    • Author(s)
      安武裕輔、金﨑順一、深津晋
    • Organizer
      電子情報通信学会・シリコン材料・デバイス研究会(SDM)
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 光学的にとらえたGe中の非平衡電子の超高速緩和過程とそれにともなう特異な物性2022

    • Author(s)
      安武裕輔、金﨑順一、深津晋
    • Organizer
      電子情報通信学会・シリコン材料・デバイス研究会(SDM)
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Raman spectroscopic studies of laser-induced structural change of epitaxial graphene layers on SiC(0001)2021

    • Author(s)
      R. Horie, T. Yamana, J. Kanasaki, K. Kisoda, C. Itoh, I. Yamamoto, J. Azuma, K. Takahashi
    • Organizer
      International Symposium on Surface Science (ISSS-9)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] シリコン表面近傍における光注入価電子正孔系の超高速緩和現象2021

    • Author(s)
      佐藤悠介、金﨑順一、谷村克己、山本勇、東純平、深津晋
    • Organizer
      2021年第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] シリコンにおける光注入価電子正孔系の超高速緩和現象2020

    • Author(s)
      佐藤悠介、金﨑順一、山本勇、東純平、深津晋
    • Organizer
      2020年第81回応用物理学会秋季学術講演大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] シリコン表面近傍における光注入価電子正孔系の超高速緩和過程2020

    • Author(s)
      佐藤悠介、金﨑順一、山本勇、東純平、深津晋
    • Organizer
      日本表面真空学会2020年学術講演大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 半導体表面における励起物性 -超高速キャリア動力学と光誘起構造変化-2020

    • Author(s)
      金﨑順一
    • Organizer
      佐賀大学 シンクロトロン光応用研究センター講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] ゲルマニウムにおける励起電子系の超高速動力学2019

    • Author(s)
      金﨑順一、山本勇、東純平、深津晋
    • Organizer
      応用物理学会学術講演大会2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Optical Control of Structural Transformation to Form Nano-sclaed Phase Including sp3-like Interlayer bonds in Graphite2019

    • Author(s)
      Jun'ichi Kanasaki
    • Organizer
      15th International Conference of Laser Ablation (COLA-2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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