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spin-current generation based on static-dynamic chirality conversion in chiral organic crystals

Research Project

Project/Area Number 20K20903
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionInstitute for Molecular Science

Principal Investigator

Hirobe Daichi  分子科学研究所, 協奏分子システム研究センター, 助教 (70823235)

Project Period (FY) 2020-07-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Keywordsスピン流 / キラリティ / キラル誘起スピン選択性 / 半導体 / 超伝導体 / スピン偏極
Outline of Research at the Start

本研究はキラルな原子配列という“静的な”キラリティから、電子の自転運動の流れ―スピン流―という“動的な”キラリティを生成する質的に新しい交差物性を開拓するものである。キラルな有機結晶の磁気抵抗効果を系統的に検出することで、たしかにスピン流が生じること、そしてその起源がキラリティにあることを示す。

Outline of Final Research Achievements

Chiral molecules can exhibit spin-selective charge emission, known as chiral-induced spin selectivity. Despite the constituent light elements of the molecules, the spin polarization can approach that of typical ferromagnets. However, the mechanism of the spin selectivity is elusive. A hypothesis on the mechanism has been proposed that time-reversal symmetry breaking is essential. In this study, we tested the working hypothesis by investigating charge-to-spin conversion in a chiral organic crystal. We found a pair of oppositely polarized spins and effective enhancement of spin-orbit interaction, both of which are consistent with the working hypothesis based on time-reversal symmetry breaking. We anticipate that our results will give clues to the mechanism of chirality-induced spin selectivity.

Academic Significance and Societal Importance of the Research Achievements

従来のスピントロニクスでは、電気的スピン流生成のために、第一に強磁性金属のスピン交換結合、第二に貴金属や異種接合界面における強いスピン軌道相互作用が活用された。これらの物質観では、非磁性かつスピン軌道相互作用の小さな軽元素は、一見するとスピン流生成に不適である。それゆえ、キラルな有機結晶での静的-動的キラリティ変換に関する本研究成果は、従来の概念体系にないスピントロニクス効果の存在を支持するものである。また、π電子系を基軸とする本アプローチは、固体物性と分子科学を架橋する点で有為であり、双方のスピントロニクス関連分野に新たな物質設計指針を提供することも期待できる。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2022 2021 2020

All Journal Article (5 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (4 results)

  • [Journal Article] Unusual stoichiometry, band structure and band filling in conducting enantiopure radical cation salts of TM-BEDT-TTF showing helical packing of the donors2021

    • Author(s)
      Pop Flavia、Meziere Cecile、Allain Magali、Auban-Senzier Pascale、Tajima Naoya、Hirobe Daichi、Yamamoto Hiroshi M.、Canadell Enric、Avarvari Narcis
    • Journal Title

      Journal of Materials Chemistry C

      Volume: 9 Issue: 33 Pages: 10777-10786

    • DOI

      10.1039/d1tc01112j

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chirality-Induced Spin Polarization over Macroscopic Distances in Chiral Disilicide Crystals2021

    • Author(s)
      Shiota Kohei、Inui Akito、Hosaka Yuta、Amano Ryoga、Onuki Yoshichika、Hedo Masato、Nakama Takao、Hirobe Daichi、Ohe Jun-ichiro、Kishine Jun-ichiro、Yamamoto Hiroshi M.、Shishido Hiroaki、Togawa Yoshihiko
    • Journal Title

      Physical Review Letters

      Volume: 127 Issue: 12 Pages: 126602-126602

    • DOI

      10.1103/physrevlett.127.126602

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Double Heterohelicenes Composed of Benzo[b]- and Dibenzo[b,i]phenoxazine: A Comprehensive Comparison of Their Electronic and Chiroptical Properties2021

    • Author(s)
      Sakamaki Daisuke、Tanaka Shunya、Tanaka Katsuki、Takino Mayu、Gon Masayuki、Tanaka Kazuo、Hirose Takashi、Hirobe Daichi、Yamamoto Hiroshi M.、Fujiwara Hideki
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 12 Issue: 38 Pages: 9283-9292

    • DOI

      10.1021/acs.jpclett.1c02896

    • NAID

      120007185774

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Unusual stoichiometry, band structure and band filling in conducting enantiopure radical cation salts of TM-BEDT-TTF showing helical packing of the donors2021

    • Author(s)
      Flavia Pop, Cecile Meziere, Magali Allain, Pascale Auban-Senzier, Naoya Tajima, Daichi Hirobe, Hiroshi M. Yamamoto, Enric Canadell, Narcis Avarvari
    • Journal Title

      Journal of Materials Chemistry C

      Volume: -

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Current-induced bulk magnetization of a chiral crystal CrNb3S62020

    • Author(s)
      Nabei Yoji、Hirobe Daichi、Shimamoto Yusuke、Shiota Kohei、Inui Akito、Kousaka Yusuke、Togawa Yoshihiko、Yamamoto Hiroshi M.
    • Journal Title

      Applied Physics Letters

      Volume: 117 Issue: 5 Pages: 052408-052408

    • DOI

      10.1063/5.0017882

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] キラル有機超伝導体のスピン依存伝導現象2022

    • Author(s)
      中島良太, 廣部大地, 佐藤拓朗, 川口玄太, 鍋井庸次, 成島哲也, 岡本裕巳, 山本浩史
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Spin-dependent conductive phenomena in a chiral organic superconductor2021

    • Author(s)
      Ryota Nakajima, Daichi Hirobe, Takuro Sato, Genta Kawaguchi, Yoji Nabei, Tetsuya Narushima, Hiromi Okamoto, Hiroshi M Yamamoto
    • Organizer
      Materials Research Meeting 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Current-Induced Bulk Magnetization of a Chiral Crystal CrNb3S62021

    • Author(s)
      Yoji Nabei, Daichi Hirobe, Yusuke Shimamoto, Kohei Shiota, Akito Inui, Yusuke Kousaka, Yoshihiko Togawa, Hiroshi M Yamamoto
    • Organizer
      Materials Research Meeting 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] キラル結晶CrNb3S6における電流誘起磁性2020

    • Author(s)
      鍋井庸次、廣部大地、島本雄介、塩田航平、乾皓人、高阪勇輔、戸川欣彦、山本浩史
    • Organizer
      日本物理学会
    • Related Report
      2020 Research-status Report

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Published: 2020-08-03   Modified: 2023-03-23  

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