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Dissipationless current generation from terahertz photon via magnetic excitations

Research Project

Project/Area Number 21H01796
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionThe University of Tokyo

Principal Investigator

Takahashi Youtarou  東京大学, 大学院工学系研究科(工学部), 准教授 (30631676)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2023: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2022: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2021: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
Keywordsテラヘルツ / マルチフェロイクス / 光起電力 / 光起電力効果 / 光物性 / 磁性体
Outline of Research at the Start

シフトカレント機構はバルク光起電力効果の機構の一つである。一般的には、バンド間遷移によってシフトカレント機構に由来した非散逸電流が生じるが、近年、磁性強誘電体マルチフェロイクス中の磁気励起「エレクトロマグノン」の共鳴励起により、シフトカレント機構を介した光電流が生じるという理論が提唱された。テラヘルツ光の照射により絶縁体中で光起電力効果が期待できる。本研究では、バンド間遷移を介さない光起電力効果であるエレクトロマグノン励起によるテラヘルツシフトカレントの存在を実証し、学理構築、機能性の探索を行い、テラヘルツ光電流デバイスの基礎を築く。

Outline of Final Research Achievements

We investigate the terahertz shift current generation through the creation of the magnetic excitations in the multiferroics, which break the space-inversion symmetry by the spin-orderings. The electromagnon resonance, which is a elementary excitation of multiferroics of spin-origin, is predicted to exhibit the conversion from terahertz photon to the dc current through the shift current mechanism. We demonstrated this terahertz photocurrent generation on the perovskite rare-earth manganite with cycloidal spin-spiral phase. The photo-creation of the electromagnon driven by the exchange-striction mechanism was found to generate the photocurrent, while keeping the highly insulating state without charge carriers. The observed electromagnon photocurrent is reasonably explained by the extended shift current mechanism, which incorporates the coupling between the electronic bands and spin excitations.

Academic Significance and Societal Importance of the Research Achievements

光子を電流に変換する光起電力効果は現代の科学技術を支える重要な基盤である。一般的には半導体のバンド間遷移を用いることで光を電流に変換するが、この原理を直接テラヘルツ帯へ適用することは困難であり、テラヘルツ技術が発展途上である理由のひとつになっている。ここでは、マルチフェロイクス中のスピン励起の共鳴を利用することで、テラヘルツ光を電流に変換することに成功した。絶縁体中で伝導に寄与するキャリアが無くとも、光起電力が生成可能であることを実証し、量子幾何学的な効果に由来するシフト電流機構の有効性を実証できた。また、将来的にはテラヘルツ光の電流変換機能としての活用が期待できる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (17 results)

All 2024 2023 2022 2021 Other

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 9 results,  Invited: 9 results) Remarks (1 results)

  • [Journal Article] Observation of anomalous Hall resonance of massive Dirac fermions in topological kagome-lattice magnet2024

    • Author(s)
      Y. Okamura, K. Shoriki, Y. Nomura, Y. Fujishiro, A. Kitaori, N. Kanazawa, R. Arita, Y. Tokura, and Y. Takahashi
    • Journal Title

      npj Quantum Mater.

      Volume: 8 Issue: 1 Pages: 57-57

    • DOI

      10.1038/s41535-023-00589-0

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Terahertz field driven giant nonlinear phonon response in ferroelectric semiconductor In-doped (Sn,Pb)Te2024

    • Author(s)
      Handa H.、Okamura Y.、Yoshimi R.、Tsukazaki A.、Takahashi K. S.、Tokura Y.、Takahashi Y.
    • Journal Title

      Physical Review B

      Volume: 109 Issue: 8 Pages: 1-6

    • DOI

      10.1103/physrevb.109.l081102

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Large nonlinear optical magnetoelectric response in a noncentrosymmetric magnetic Weyl semimetal2024

    • Author(s)
      K. Shoriki, K. Moriishi, Y. Okamura, K. Yokoi, H. Usui, H. Murakawa, H. Sakai, N. Hanasaki, Y. Tokura, and Y. Takahashi
    • Journal Title

      Proceedings of the National Academy of Sciences of the United States of America

      Volume: 14 Issue: 12 Pages: 1-6

    • DOI

      10.1073/pnas.2316910121

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Optical magnetoelectric effects resonantly enhanced via electromagnons in cycloidal helimagnets Eu1-xYxMnO32023

    • Author(s)
      Ogino M.、Kaneko Y.、Tokura Y.、Takahashi Y.
    • Journal Title

      Physical Review B

      Volume: 108 Issue: 2 Pages: 024418-024418

    • DOI

      10.1103/physrevb.108.024418

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Topological magneto-optical effect from skyrmion lattice2023

    • Author(s)
      Kato Yoshihiro D.、Okamura Yoshihiro、Hirschberger Max、Tokura Yoshinori、Takahashi Youtarou
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 1-7

    • DOI

      10.1038/s41467-023-41203-y

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Photovoltaic effect by soft phonon excitation2022

    • Author(s)
      Okamura Yoshihiro、Morimoto Takahiro、Ogawa Naoki、Kaneko Yoshio、Guo Guang-Yu、Nakamura Masao、Kawasaki Masashi、Nagaosa Naoto、Tokura Yoshinori、Takahashi Youtarou
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 119 Issue: 14 Pages: 2122313119-2122313119

    • DOI

      10.1073/pnas.2122313119

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Linear and nonlinear terahertz optical effects in magnetoelectric multiferroics and ferroelectrics2023

    • Author(s)
      Y. Takahashi
    • Organizer
      LEES2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Terahertz optical effects enhanced by electromagnon resonances in helimagnets2023

    • Author(s)
      Y. Takahashi
    • Organizer
      he 14th APCTP Workshop on Multiferroics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Terahertz optical effects in multiferroics2023

    • Author(s)
      Y. Takahashi
    • Organizer
      The 15th International Meeting on Ferroelectricity
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Magneto-optical study on topological magnets2022

    • Author(s)
      Y. Takahashi
    • Organizer
      Workshop on Topology in Magnetic Materials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electric field control of natural optical activity via chirality stemming from spin structure2022

    • Author(s)
      Y. Takahashi
    • Organizer
      The 6th Molecular Chirality Asia 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Terahertz optical effects in ferroelectrics and multiferroics2022

    • Author(s)
      Y. Takahashi
    • Organizer
      Ferroelecture
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Optical magnetoelectric effect in multiferroics2022

    • Author(s)
      Y. Takahashi
    • Organizer
      CIMTEC2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] サイクロイド型磁性体におけるエレクトロマグノンシフト電流2022

    • Author(s)
      荻野槙子, 岡村嘉大, 金子良夫, 十倉好紀, 高橋陽太郎
    • Organizer
      日本物理学会 第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Nonreciprocal optical responses of multiferroics2022

    • Author(s)
      Y. Takahashi
    • Organizer
      APS March Meeting 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Optical magnetoelectric responses in multiferroics2021

    • Author(s)
      Y. Takahashi
    • Organizer
      PACRIM & GOMD 2021 Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 高橋研究室ホームページ

    • URL

      https://www.qpec.t.u-tokyo.ac.jp/takahashi_lab/index.html

    • Related Report
      2023 Annual Research Report 2022 Annual Research Report 2021 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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