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Twisted二層グラフェンにおける量子輸送現象

Publicly Offered Research

Project AreaFrontiers of materials science spun from topology
Project/Area Number 16H00982
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionThe University of Tokyo

Principal Investigator

増渕 覚  東京大学, 生産技術研究所, 特任講師 (50596195)

Project Period (FY) 2016-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsグラフェン / 複合原子層 / 量子ホール効果 / バンド構造変調 / ファンデルワールスヘテロ構造 / サイクロトロン共鳴 / 物性実験 / メゾスコピック系 / マイクロ・ナノデバイス / ナノ材料
Outline of Annual Research Achievements

本年度は、Twisted二層グラフェンにおける量子輸送現象解明に向けて、以下の研究を推進した。
・複合原子層作製作業の自動化:これまでTwisted二層グラフェンの作製作業は何れの研究室においても研究者の手作業により行われていた。研究の進展とともに、求められる素子構造が膨潤し、研究活動時間が圧迫される悪循環が生じていた。この問題を解決するため、ファンデルワールス接合構造の作製工程を自動化する自律ロボットシステムを開発した。本システムの利用により、1200枚の単層グラフェンを4時間で自動探索し、グラフェンとhBNを交互に8時間で30階積層することが可能となった。遷移金属カルコゲナイドも含む様々な二次元結晶が利用可能で、作製した素子は既存の最高品質素子に並ぶ高品質を示した。
・Twisted2層/3層グラフェンにおけるHofstadter's Butterflyの観測:自律ロボットシステムを用いることで結晶方位をTwistした2層/3層グラフェンを作製した。電気伝導特性評価を行ったところ、2層/3層グラフェンの結晶格子が構成するモアレ超格子の影響により、素子中に形成されたサブバンドに由来する電荷中性点が観測された。磁場を印加したところ、各サブバンドから生じるランダウ準位が交差したHofstadter's Butterflyを初めて観測した。現在、海外の理論研究グループと共同で実験データの解析を進めている。
・3層グラフェンにおけるランダウ準位反交差:Twist角制御による運動量空間におけるバンド構造変調の理解を深めるため、3層グラフェンを舞台として面内磁場印加による電子波動関数の運動量空間における平行シフトを導入した。単層グラフェン様バンドと2層グラフェン様バンド混成を実験・理論の両面から解明した。
・共同研究:ケンブリッジ大学・産業技術総合研究所に高品質試料の提供を行った。

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (37 results)

All 2018 2017 2016 Other

All Int'l Joint Research (3 results) Journal Article (9 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 9 results,  Open Access: 2 results,  Acknowledgement Compliant: 3 results) Presentation (24 results) (of which Int'l Joint Research: 16 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)

  • [Int'l Joint Research] University of Cambridge/National Physical Laboratory(United Kingdom)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Univ. Grenoble(France)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] ENS-CNRS(France)

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Autonomous robotic searching and assembly of two-dimensional crystals to build van der Waals superlattices2018

    • Author(s)
      Satoru Masubuchi, Masataka Morimoto, Sei Morikawa, Momoko Onodera, Yuta Asakawa, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida
    • Journal Title

      Nature Communications

      Volume: 9 Issue: 1 Pages: 1413-1413

    • DOI

      10.1038/s41467-018-03723-w

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Imaging Bulk and Edge Transport near the Dirac Point in Graphene Moire 769; Superlattices2018

    • Author(s)
      Z. Dou, S. Morikawa, A. Cresti, S.-W. Wang, C. G. Smith, C. Melios, O. Kazakova, K. Watanabe, T. Taniguchi, S. Masubuchi, T. Machida, M. R. Connolly
    • Journal Title

      Nano Lett.

      Volume: 18 Issue: 4 Pages: 2530-2537

    • DOI

      10.1021/acs.nanolett.8b00228

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Extremely large magnetoresistance in a high-quality WTe2 grown by flux method2018

    • Author(s)
      K. Tsumura, R. Yano, H. Kashiwaya, M. Koyanagi, S. Masubuchi, T. Machida, H. Namiki, T. Sasagawa and S. Kashiwaya
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 969 Pages: 012134-012134

    • DOI

      10.1088/1742-6596/969/1/012134

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Intersubband Landau Level Couplings Induced by In-Plane Magnetic Fields in Trilayer Graphene2017

    • Author(s)
      Yuta Asakawa, Satoru Masubuchi, Naoko Inoue, Sei Morikawa, Kenji Watanabe, Takashi Taniguchi, and Tomoki Machida
    • Journal Title

      Physical Review Letters

      Volume: 119 Issue: 18 Pages: 186802-186802

    • DOI

      10.1103/physrevlett.119.186802

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Suppression of exciton-exciton annihilation in tungsten disulfide monolayers encapsulated by hexagonal boron nitrides2017

    • Author(s)
      Yusuke Hoshi, Takashi Kuroda, Mitsuhiro Okada, Rai Moriya, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Ryo Kitaura, and Tomoki Machida
    • Journal Title

      Physical Review B

      Volume: 95 Issue: 24 Pages: 241403-241403

    • DOI

      10.1103/physrevb.95.241403

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Exfoliation and van der Waals heterostructure assembly of intercalated ferromagnet Cr1/3TaS22017

    • Author(s)
      Yuji Yamasaki, Rai Moriya, Miho Arai, Satoru Masubuchi, Sunseng Pyon, Tsuyoshi Tamegai, Keiji Ueno, Tomoki Machida
    • Journal Title

      2D Materials

      Volume: 4 Issue: 4 Pages: 041007-041007

    • DOI

      10.1088/2053-1583/aa8a2b

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dirac fermion reflector by ballistic graphene sawtooth-shaped npn junctions2017

    • Author(s)
      S. Morikawa, Q. Wilmart S. Masubuchi, K. Watanabe, T. Taniguchi, B. Placais, and T. Machida
    • Journal Title

      Semicondoctor Science and Technology,

      Volume: 32 Issue: 4 Pages: 045010-045010

    • DOI

      10.1088/1361-6641/aa6102

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] N- and p-type carrier injections into WSe2 with van der Waals contacts of two-dimensional materials2017

    • Author(s)
      Yohta Sata, Rai Moriya, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 56 Issue: 4S Pages: 04CK09-04CK09

    • DOI

      10.7567/jjap.56.04ck09

    • NAID

      210000147636

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Comparisons of magnetoresistance in triangular and rectangular ballistic graphene npn junctions2016

    • Author(s)
      S. Morikawa, S. Masubuchi, K. Watanabe, T. Taniguchi, and T. Machida
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 55 Issue: 10 Pages: 100305-100305

    • DOI

      10.7567/jjap.55.100305

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] ファンデルワールス超格子の自動作製 :ロボットによる二次元層状物質の劈開・探索・積層2018

    • Author(s)
      増渕覚, 森本将崇, 小野寺桃子, 森川生, 渡邊賢司, 谷口尚, 町田友樹
    • Organizer
      日本物理学会2018年春季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] ファンデルワールス超格子の自動作製:ロボットによる二次元層状物質の劈開・探索・積層2018

    • Author(s)
      増渕覚, 森本将崇, 小野寺桃子, 森川生, 渡邊賢司, 谷口尚, 町田友樹
    • Organizer
      第65回 応用物理学会 春季学術講演会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Automated searching and assembly of atomic layers: a robotic building system of van der Waals superlattices2018

    • Author(s)
      Satoru Masubuchi, Masataka Morimoto, Momoko Onodera, Sei Morikawa, Kenji Watanabe, Takashi Taniguchi, and Tomoki Machida
    • Organizer
      第54回 フラーレン・ナノチューブ・グラフェン 総合シンポジウム
    • Related Report
      2017 Annual Research Report
  • [Presentation] Inter-subband Landau level couplings induced by in-plane magnetic fields in trilayer graphene2018

    • Author(s)
      S Masubuchi, Y Asakawa, N Inoue, K Watanabe, T Taniguchi, T Machida
    • Organizer
      American Physical Society March Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Automated searching and assembly of atomic layers: a robotic building system of van der Waals superlattices2018

    • Author(s)
      Satoru Masubuchi, Masataka Morimoto, Momoko Onodera, Sei Morikawa, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida
    • Organizer
      American Physical Society March Meeting
    • Related Report
      2017 Annual Research Report
  • [Presentation] Imaging Bulk and Edge Transport near the Dirac Point in Graphene Moire Superlattices2018

    • Author(s)
      Ziwei Dou, Sei Morikawa, Alessandro Cresti, Shu-Wei Wang, Charles G. Smith, Christos Melios, Olga Kazakova, Kenji Watanabe, Takashi Taniguchi, Satoru Masubuchi, Tomoki Machida, and Malcolm R. Connolly
    • Organizer
      American Physical Society March Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] グラフェンpn接合でのサイクロトロン共鳴による光起電力測定2018

    • Author(s)
      木下 圭、守谷 頼、荒井 美穂、増渕 覚、渡邊 賢司、谷口 尚、町田 友樹
    • Organizer
      第65回 応用物理学会 春季学術講演会
    • Related Report
      2017 Annual Research Report
  • [Presentation] グラフェン/hBN/グラフェンvan der Waalsヘテロ接合におけるトンネル効果2018

    • Author(s)
      瀬尾優太, 増渕覚, 小野寺桃子, 渡邊賢司, 谷口尚, 町田友樹
    • Organizer
      日本物理学会2018年春季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Tunneling transport between monolayer graphene and bilayer graphene in high magnetic fields2018

    • Author(s)
      Momoko Onodera, Sei, Morikawa, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida
    • Organizer
      Graphene Weeks 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 面内磁場の誘起するABA三層グラフェンのランダウ準位反交差2017

    • Author(s)
      浅川友太、増渕覚、井上尚子、森川生、渡邊賢司、谷口 尚、町田友樹
    • Organizer
      日本物理学会第72回年次大会、17pB21-4、大阪大学、大阪 (2016).
    • Place of Presentation
      大阪大学、大阪
    • Year and Date
      2017-03-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] Automated searching and assembly of atomic layers: a robotic building system of van der Waals superlattices2017

    • Author(s)
      Satoru Masubuchi, Masataka Morimoto, Momoko Onodera, Sei Morikawa, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida
    • Organizer
      Graphene Weeks 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Imaging Bulk and Edge Transport near the Dirac Point in Graphene Moire Superlattices2017

    • Author(s)
      Ziwei Dou, Sei Morikawa, Alessandro Cresti, Shu-Wei Wang, Charles G. Smith, Christos Melios, Olga Kazakova, Kenji Watanabe, Takashi Taniguchi, Satoru Masubuchi, Tomoki Machida, and Malcolm R. Connolly
    • Organizer
      Graphene Weeks 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 三層グラフェンにおけるランダウ準位交差・反交差の観測2016

    • Author(s)
      増渕 覚、浅川友太、井上尚子、森川 生、渡邊賢司、谷口 尚、町田友樹
    • Organizer
      第30回ダイヤモンドシンポジウム、P2-24、東京大学駒場リサーチキャンパス、東京 (2016).
    • Place of Presentation
      東京大学生産技術研究所、東京
    • Year and Date
      2016-11-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] Tunnel magnetoresistance effect in van der Waals junction built from layered material ferromagnets2016

    • Author(s)
      R. Moriya, M. Arai, Y. Yamasaki, S. Masubuchi, K. Ueno, and T. Machida
    • Organizer
      9th International Conference on Physics and Applications of Spin-Related Phenomena in Solids (PASPS9), P1-28, Kobe-city, Japan (2016).
    • Place of Presentation
      Kobe, Japan
    • Year and Date
      2016-10-21
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of substrate interaction on the optical properties of hBN/WS2 van der Waals heterostructures2016

    • Author(s)
      Y. Hoshi, R. Moriya, M. Arai, S. Masubuchi, T. Kuroda, K. Watanabe, T. Taniguchi, and T. Machida
    • Organizer
      The 22nd International Conference on High Magnetic Fields in Semiconductor Physics (HMF-22), Mo-B-2, Hokkaido, Japan (2016).
    • Place of Presentation
      Hokkaido, Japan
    • Year and Date
      2016-07-26
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Enhancement of resistance in ballistic graphene sawtoogh-shaped npn junctions2016

    • Author(s)
      S. Morikawa, Q. Wilmart, S. Masubuchi, K. Watanabe, T. Taniguchi, B. Placais, and T. Machida
    • Organizer
      The 22nd International Conference on High Magnetic Fields in Semiconductor Physics (HMF-22), Mo-B-2, Hokkaido, Japan (2016).
    • Place of Presentation
      Hokkaido, Japan
    • Year and Date
      2016-07-26
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Van der Waals assembly of layered ferromagnetic dichalcogenide2016

    • Author(s)
      M. Arai, Y. Yamasaki, R. Moriya, S. Masubuchi, K. Ueno, and T. Machida
    • Organizer
      The 22nd International Conference on High Magnetic Fields in Semiconductor Physics (HMF-22), Mo-B-2, Hokkaido, Japan (2016).
    • Place of Presentation
      Hokkaido, Japan
    • Year and Date
      2016-07-26
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Quantum Hall effect in a slightly twisted bilayer graphene2016

    • Author(s)
      S. Masubuchi, N. Inoue, Y. Asakawa, R. Kashiwagi, S. Morikawa, K. Watanabe, T. Taniguchi, and T. Machida
    • Organizer
      The 22nd International Conference on High Magnetic Fields in Semiconductor Physics (HMF-22), Mo-B-2, Hokkaido, Japan (2016).
    • Place of Presentation
      Hokkaido, Japan
    • Year and Date
      2016-07-25
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of crossings and anti-crossings of subband levels in bernal trilayer graphene2016

    • Author(s)
      Y. Asakawa, S. Masubuchi, N. Inoue, S. Morikawa, K. Watanabe, T. Taniguchi, and T. Machida
    • Organizer
      The 22nd International Conference on High Magnetic Fields in Semiconductor Physics (HMF-22), Mo-B-2, Hokkaido, Japan (2016).
    • Place of Presentation
      Hokkaido, Japan
    • Year and Date
      2016-07-25
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Josephson effect in van der Waals junctions of 2D layered superconductors2016

    • Author(s)
      T. Machida, R. Moriya, N. Yabuki, M. Arai, Y. Sata, S. Morikawa, and S. Masubuchi
    • Organizer
      Graphene Week 2016, Warsaw, Poland (2016).
    • Place of Presentation
      Warsaw, Poland
    • Year and Date
      2016-06-15
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Tunnel magnetoresistance effect in van der Waals junction composed of layered material ferromagnets2016

    • Author(s)
      Y. Yamasaki, M. Arai, R. Moriya, S. Masubuchi, K. Ueno, and T. Machida
    • Organizer
      Graphene Week 2016, Warsaw, Poland (2016).
    • Place of Presentation
      Warsaw, Poland
    • Year and Date
      2016-06-15
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of Subband Landau Level Crossings and Anticrossings in Bernal Trilayer Graphene2016

    • Author(s)
      Y. Asakawa, S. Masubuchi, N. Inoue, S. Morikawa, K. Watanabe, T. Taniguchi, and T. Machida
    • Organizer
      Graphene Week 2016, Warsaw, Poland (2016).
    • Place of Presentation
      Warsaw, Poland
    • Year and Date
      2016-06-15
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Manipulation of ballistic carrier trajectories in graphene by triangular shape npn junctions2016

    • Author(s)
      S. Morikawa, Q. Wilmart, S. Masubuchi, K. Watanabe, T. Taniguchi, B. Placais, and T. Machida
    • Organizer
      Graphene Week 2016, Warsaw, Poland (2016).
    • Place of Presentation
      Warsaw, Poland
    • Year and Date
      2016-06-14
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Imaging ballisitc and non-local transport in graphene using scanning gate microscopy2016

    • Author(s)
      Z. Dou, S. Morikawa, S. W. Wang, C. G. Smith, K. Watabe, T. Taniguchi, S. Masubuchi, T. Machida, and M. R. Connolly
    • Organizer
      Graphene Week 2016, Warsaw, Poland (2016).
    • Place of Presentation
      Warsaw, Poland
    • Year and Date
      2016-06-13
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] Robotic building system of van der Waals superlattices2018

    • Inventor(s)
      Satoru Masubuchi, Tomoki Machida
    • Industrial Property Rights Holder
      Satoru Masubuchi, Tomoki Machida
    • Industrial Property Rights Type
      特許
    • Filing Date
      2018
    • Related Report
      2017 Annual Research Report
    • Overseas

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Published: 2016-04-26   Modified: 2018-12-17  

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