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THz Control of Floquet Topological Insulator in Massless Dirac Fermions

Research Project

Project/Area Number 18H01905
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 30020:Optical engineering and photon science-related
Research InstitutionIchinoseki National College of Technology (2020, 2022)
Institute of Physical and Chemical Research (2018-2019)

Principal Investigator

Yamashita Masatsugu  一関工業高等専門学校, その他部局等, 准教授 (10360661)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2019: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2018: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Keywordsテラヘルツ光 / ディラック電子系 / トポロジー / 高次高調波 / テラヘルツ / グラフェン / テラヘルツ電磁波 / フロッケ理論 / 高強度テラヘルツ光 / 高次高調波発生 / 高強度テラヘルツ / フロッケ状態
Outline of Final Research Achievements

We performed THz spectrosocopy of massless Dirac fermions in graphene under circurlary polarized THz pump pulse (~100 nJ/pulse) irradiation and successfully observed the rotation of the polarization state of THz probe pulse, indicating the photo-indcued Hall effec. Furthermore, we successfully measured the even order of
high harmonic generation of mid infrared under circularly polarized THz pulse irraditaion. This indicates the time reversal symmetry breaking of massless Dirac fermion and the emergence of photo-induced Berry curverture and Floquet topological insulator phase in graphene.

Academic Significance and Societal Importance of the Research Achievements

本研究成果はTHz円偏光パルス照射によって時間反転対称性を破ることで、グラフェンMassless Dirac電子系(MDF)を非自明なFloquetトポロジカル絶縁体(FTI)へ転移させ、MDFの量子物性を制御する手法として期待できる。THz光を用いることで中赤外、近赤外励起光を用いるよりも1/10以下の低い照射強度でトポロジカル層の制御が可能であることが示された。
本手法を発展させてトポロジカル絶縁体や超伝導体に適用することにより、スピン量子ホール効果・スピン流の超高速制御、トポロジカル超伝導体・トポロジカル量子ビット(マヨナラ粒子)の実現・制御技術として期待できる。

Report

(4 results)
  • 2022 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (11 results)

All 2022 2021 2018

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (9 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Intrinsic and extrinsic effects on intraband optical conductivity of hot carriers in photoexcited graphene2021

    • Author(s)
      Masatsugu Yamashita and Chiko Otani
    • Journal Title

      PHYSICAL REVIEW RESEARCH

      Volume: 3 Issue: 1 Pages: 013150-013150

    • DOI

      10.1103/physrevresearch.3.013150

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hot carrier dynamics and electron-optical phonon coupling in photoexcited graphene via time-resolved ultrabroadband terahertz spectroscopy2021

    • Author(s)
      Sho Ikeda, Chiko Otani, and Masatsugu Yamashita
    • Journal Title

      PHYSICAL REVIEW RESEARCH

      Volume: 3 Issue: 4 Pages: 043143-043143

    • DOI

      10.1103/physrevresearch.3.043143

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Hot carrier dynamics and electron-phonon coupling in photoexcited graphene investigated by time-resolved terahertz spectroscopy2022

    • Author(s)
      Masatsugu Yamashita, Sho Ikeda, Chiko Otani
    • Organizer
      第9回「光量子工学研究」ーエクストリームフォトニクスが拓く未来の光科学ー
    • Related Report
      2019 Annual Research Report
  • [Presentation] 時間分解THz分光による グラフェン電子フォノン結合定数の評価2022

    • Author(s)
      山下将嗣, 池田翔, 大谷知行
    • Organizer
      第69回応用物理学会 春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Hot carrier dynamics and electron-optical phonon coupling studied by time resolved THz spectroscopy2021

    • Author(s)
      Masatsugu Yamashita, Sho Ikeda, Chiko Otani
    • Organizer
      9th Russia-Japan-USA-Europe Symposium on Fundamental & Applied Problems of Terahertz Devices & Technologies
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Optical Generation of High-power Terahertz Pulses for Tunable Wave Source2018

    • Author(s)
      吉峯功 山下将嗣 保科宏道 齊藤美紀子 南出泰亜 大谷知行
    • Organizer
      2018 43rd International Conference on Infrared, Millieter and Terahertz Waves
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Polarization and frequency control of terahertz pulse emission via nonlinear optical effect2018

    • Author(s)
      吉峯功 山下将嗣 保科宏道 齋藤美紀子 南出泰亜 大谷知行
    • Organizer
      理研シンポジウム 第6回「光量子工学研究」
    • Related Report
      2018 Annual Research Report
  • [Presentation] Floquet topological phase transition by high power terahertz wave2018

    • Author(s)
      山下将嗣 吉峯功 大谷知行
    • Organizer
      理研シンポジウム 第6回「光量子工学研究」
    • Related Report
      2018 Annual Research Report
  • [Presentation] 光パルスを用いた高強度テラヘルツ波発生における偏光・周波数制御2018

    • Author(s)
      吉峯功 山下将嗣 保科宏道 齋藤美紀子 南出泰亜 大谷知行
    • Organizer
      シンポジウム「テラヘルツ科学の最先端V」
    • Related Report
      2018 Annual Research Report
  • [Presentation] Optical terahertz emission for waveform shaping of high-power terahertz pulses2018

    • Author(s)
      吉峯功 山下将嗣 保科宏道 齋藤美紀子 南出泰亜 大谷知行
    • Organizer
      The 19th EA Sub-mm-wave Receiver Technology Workshop and the 5th Riken-NICT Joint Workshop on Terahertz Technology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 有機非線形結晶を用いた高強度テラヘルツ波発生とその偏光制御2018

    • Author(s)
      吉峯功 山下将嗣 保科宏道 齋藤美紀子 南出泰亜 大谷知行
    • Organizer
      電子デバイス研究会「ミリ波・テラヘルツ波デバイス・システム」
    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2024-01-30  

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