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Observation of cyclotron resonance in twisted bilayer graphene

Research Project

Project/Area Number 21K20345
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Onodera Momoko  東京大学, 生産技術研究所, 特任助教 (10907819)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsグラフェン / 二次元層状物質 / 中赤外光応答 / サイクロトロン共鳴 / ファンデルワールス接合 / 二次元マテリアル / 量子ホール効果 / 量子輸送現象
Outline of Research at the Start

単層グラフェン同士を微小ツイスト角度θで積層したツイスト積層二層グラフェンにおけるサイクロトロン共鳴吸収を観測する。サイクロトロン共鳴吸収ではランダウ準位間隔を直接的に反映したシグナルが得られるため、魔法角(1.1°±0.05°)近辺でツイスト角度θに対して極めて敏感に変化するフェルミ速度やランダウ準位構造、特異な量子輸送特性を明らかにできる。より精密なツイスト角度制御を実現するため、レーザー加工を活用した新規積層手法にも取り組む。

Outline of Final Research Achievements

We fabricated twisted graphene (tBLG) devices and measured photo response of the devices at low temperatures and under high magnetic field. Mid-infrared light was irradiated to the device through optical fiber from the CO2 laser source. We observed unique photo voltage signals due to cyclotron resonance absorption in the tBLG device with a twist angle of 2.0 deg. We will further investigate the angle dependence of the signals in the future.

Academic Significance and Societal Importance of the Research Achievements

本成果はツイスト二層グラフェンにおけるサイクロトロン共鳴吸収実験として世界初のものであり、学術的に非常に大きな意味を持つ。今だ未解明であるツイスト二層グラフェンのランダウ準位解明に向けて大きな一歩となる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2022

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results)

  • [Journal Article] Evaluation of polyvinyl chloride adhesion to 2D crystal flakes2022

    • Author(s)
      Wakafuji Yusai、Onodera Momoko、Masubuchi Satoru、Moriya Rai、Zhang Yijin、Watanabe Kenji、Taniguchi Takashi、Machida Tomoki
    • Journal Title

      npj 2D Materials and Applications

      Volume: 6 Issue: 1 Pages: 44-44

    • DOI

      10.1038/s41699-022-00323-7

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] All-dry flip-over stacking of van der Waals junctions of 2D materials using polyvinyl chloride2022

    • Author(s)
      Onodera Momoko、Wakafuji Yusai、Hashimoto Taketo、Masubuchi Satoru、Moriya Rai、Zhang Yijin、Watanabe Kenji、Taniguchi Takashi、Machida Tomoki
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 21963-21963

    • DOI

      10.1038/s41598-022-26193-z

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access

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Published: 2021-10-22   Modified: 2024-01-30  

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