2D Material Based Josephson Devices and Their Properties

• Project/Area Number: 18H03858
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 28:Nano/micro science and related fields
• Research Institution: Tohoku University
• Principal Investigator: Chen Yong 東北大学, 材料科学高等研究所, 教授 (30806732)
• Co-Investigator(Kenkyū-buntansha): 井土 宏 東北大学, 材料科学高等研究所, 助教 (20784507) ; 熊谷 明哉 東北大学, 材料科学高等研究所, 准教授 (50568433) ; 谷垣 勝己 東北大学, 材料科学高等研究所, 名誉教授 (60305612)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Granted (Fiscal Year 2020)
• Budget Amount: ¥44,980,000 (Direct Cost: ¥34,600,000、Indirect Cost: ¥10,380,000); Fiscal Year 2021: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000); Fiscal Year 2020: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000); Fiscal Year 2019: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000); Fiscal Year 2018: ¥23,270,000 (Direct Cost: ¥17,900,000、Indirect Cost: ¥5,370,000)
• Keywords: マイクロ・ナノデバイス / 低温物性 / 超伝導材料・素子

Outline of Annual Research Achievements

理想的な二次元構造を有する原子層、１層からなる二次元材料は、理想的な電子伝導からバルクの物性を凌駕し、特異な物理現象を有する。本研究提案では、二次元材料の理想構造を最大限に活かした新規デバイスの構築を行うことを目標として、例えばh-BNを中心に絶縁体である二次元材料をトンネル障壁としたジョセフソン素子の構築やその物性評価を行う。また、高品質な原子層を用いたヘテロ構造の構築技術を用いて、二次元材料の特異性を制御ないし、機能性を創発するデバイス構造を構築する。更に、電界または磁場を印加することで、低次元における特異な物性を評価する。本年度は、グローブボックス内の大気非曝露の環境にて単結晶二次元材料より作製した二次元材料またはそのヘテロ構造の素子の作製とその物性評価を行った。特に、昨年度構築したジョセフソン素子の作製技術を応用して、磁性体二次元材料へのヘテロ構造やその光学特性の評価にも応用した。磁性体二次元材料に関しては、NiOとCr2Ge2Te6のヘテロ界面においてキュリー温度の上昇を確認することに成功した。また、光学特性に関しては、MoTe2素子を作製し、その光電流効果について検証した結果、結晶対称性に由来した光電流の２成分の観測にも成功している。更に、二次元材料の角度制御ヘテロ構造の特異物性の評価として電気化学顕微鏡などのイオンを介在した反応系の計測や高機能性を有する構造の定量的な特定も可能となり、他分野への応用も模索することが可能となった。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

水分・酸素濃度を1 ppm以下に抑えることが可能となったグローブボックスの導入やその中に配置したヘテロ界面の構築のための基板温度制御可能な制御機構の導入、及び金属蒸着機との複合的な装置の開発が順調に進んだことにより、不活性ガス雰囲気化での単結晶二次元材料を用いたヘテロ界面の構築及びその角度制御、また電子線リソグラフィーなどを用いて、それら構造への精緻な素子構造の構築が可能となり、研究計画の幅が広がった。また、当初のジョセフソン素子構造の作製も成功のみならず、光学・磁性・イオン反応特性への応用展開も可能となったことから本研究はおおむね順調に進展している。

Strategy for Future Research Activity

今後の研究としては、素子構造作製からその分析・分析評価装置が一貫され配置した統合型複合装置への改良を行う。これにより、清浄な界面を維持し、二次元材料がもつ機能性創発とその観測に注力する。また、他分野への応用展開も見据え、当初の低温物性評価のみならず、エネルギーデバイスや二次元の構造を制御したトポロジーによる物性変化も追随していく予定である。

Research Products

• [Journal Article] Highly skewed current phase relation in superconductor-topological insulator-superconductor Josephson junctions (2020)
  • Author(s): Kayyalha Morteza、Kazakov Aleksandr、Miotkowski Ireneusz、Khlebnikov Sergei、Rokhinson Leonid P.、Chen Yong P.
  • Journal Title: npj Quantum Materials Volume: 5 Pages: 1-7
  • DOI: 10.1038/s41535-020-0209-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High‐Resolution Electrochemical Mapping of the Hydrogen Evolution Reaction on Transition‐Metal Dichalcogenide Nanosheets (2020)
  • Author(s): Takahashi Yasufumi、Kobayashi Yu、Wang Ziqian、Ito Yoshikazu、Ota Masato、Ida Hiroki、Kumatani Akichika、Miyazawa Keisuke、Fujita Takeshi、Shiku Hitoshi、Korchev Yuri E.、Miyata Yasumitsu、Fukuma Takeshi、Chen Mingwei、Matsue Tomokazu
  • Journal Title: Angewandte Chemie Volume: 132 Pages: 3629-3636
  • DOI: 10.1002/ange.201912863
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Increased Curie temperature and enhanced perpendicular magneto anisotropy of Cr2Ge2Te6/NiO heterostructures (2019)
  • Author(s): H. Idzuchi, A. E. Llacsahuanga Allcca, X. C. Pan, K. Tanigaki, and Y. P. Chen
  • Journal Title: Applied Physics Letters Volume: 115 Pages: 232403-232403
  • DOI: 10.1063/1.5130930
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Tuning Insulator-Semimetal Transitions in 3D Topological Insulator thin Films by Intersurface Hybridization and In-Plane Magnetic Fields (2019)
  • Author(s): Xu Yang、Jiang Guodong、Miotkowski Ireneusz、Biswas Rudro R.、Chen Yong P.
  • Journal Title: Physical Review Letters Volume: 123 Pages: 207701-207701
  • DOI: 10.1103/physrevlett.123.207701
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] On the understanding of current-induced spin polarization of three-dimensional topological insulators (2019)
  • Author(s): Tian Jifa、Hong Seokmin、Sayed Shehrin、Lee Joon Sue、Datta Supriyo、Samarth Nitin、Chen Yong P.
  • Journal Title: Nature Communications Volume: 10 Pages: 1-3
  • DOI: 10.1038/s41467-019-09271-1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Differences in self-assembly of spherical C60 and planar PTCDA on rippled graphene surfaces (2019)
  • Author(s): Li Yanlong、Liu Xiaoyang、Chen Chuanhui、Duchamp James、Huang Rong、Chung Ting-Fung、Young Maxwell、Chalal Tarek、Chen Yong P.、Heflin James R.、Dorn Harry C.、Tao Chenggang
  • Journal Title: Carbon Volume: 145 Pages: 549-555
  • DOI: 10.1016/j.carbon.2019.01.070
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Anomalous Low-Temperature Enhancement of Supercurrent in Topological-Insulator Nanoribbon Josephson Junctions: Evidence for Low-Energy Andreev Bound States (2019)
  • Author(s): Kayyalha Morteza、Kargarian Mehdi、Kazakov Aleksandr、Miotkowski Ireneusz、Galitski Victor M.、Yakovenko Victor M.、Rokhinson Leonid P.、Chen Yong P.
  • Journal Title: Physical Review Letters Volume: 122 Pages: 047003-047003
  • DOI: 10.1103/physrevlett.122.047003
• [Journal Article] Chemical dopants on edge of holey graphene accelerate electrochemical hydrogen evolution reaction (2019)
  • Author(s): A. Kumatani, C. Miura, H. Kuramochi, T. Ohto, M. Wakisaka, Y. Nagata, H. Ida, Y. Takahashi, K. Hu, S. Jeong, J. Fujita, T. Matsue, Y. Ito,
  • Journal Title: Advanced Science Volume: - Pages: 1900119-1900119
  • DOI: 10.1002/advs.201900119
  • NAID: 120006649893
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Gate-tunable supercurrent and multiple Andreev reflections in a superconductor-topological insulator nanoribbon-superconductor hybrid device (2018)
  • Author(s): Jauregui Luis A.、Kayyalha Morteza、Kazakov Aleksandr、Miotkowski Ireneusz、Rokhinson Leonid P.、Chen Yong P.
  • Journal Title: Applied Physics Letters Volume: 112 Pages: 093105-093105
  • DOI: 10.1063/1.5008746
• [Journal Article] Transport measurements in twisted bilayer graphene: Electron-phonon coupling and Landau level crossing (2018)
  • Author(s): Chung Ting-Fung、Xu Yang、Chen Yong P.
  • Journal Title: Physical Review B Volume: 98 Pages: 035425-035425
  • DOI: 10.1103/physrevb.98.035425
• [Presentation] Spatially Resolved Electrochemical Microscopy: Scanning Electrochemical Cell Microscopy on Energy Functional Materials (2020)
  • Author(s): A. Kumatani
  • Organizer: EPFL Seminar
  • Int'l Joint Research / Invited
• [Presentation] Spin-dependent transport phenomena in superconducting materials (2020)
  • Author(s): Jana Lustikova, Akichika Kumatani, Guanghui Cheng, Yong P. Chen
  • Organizer: The 3rd Symposium for The Core Research Clusters for Materials Science and Spintronics
  • Int'l Joint Research
• [Presentation] 2 次元磁性体Cr2Ge2Te6 界面の誘起する強磁性転移温度上昇 (2020)
  • Author(s): 井土宏
  • Organizer: 応用物理学会春季学術講演会
• [Presentation] Spin-helical Particles: An Enabling Platform for Quantum Matter and Quantum Technologies (2019)
  • Author(s): Yong P. Chen
  • Organizer: Center for Quantum Research and Technology (CQRT) Seminar
  • Int'l Joint Research / Invited
• [Presentation] Spin-helical Particles: An Enabling Platform for Quantum Matter and Quantum Technologies (2019)
  • Author(s): Yong P. Chen
  • Organizer: Seminar at Fermi National Lab
  • Int'l Joint Research / Invited
• [Presentation] Quantum Materials for sensing applications (2019)
  • Author(s): Yong P. Chen
  • Organizer: Quantum Technologies and Sensing Workshop, IEEE Nuclear Science Symposium (NSS) and Medical-Imaging Conference (MIC)
  • Int'l Joint Research / Invited
• [Presentation] Spin-helical Particles: An Enabling Platform for Quantum Matter and Quantum Technologies (2019)
  • Author(s): Yong P. Chen
  • Organizer: 66th AVS (American Vacuum Society) International Symposium
  • Int'l Joint Research / Invited
• [Presentation] Topological protected quantum devices: from spin batteries to Josephson Junctions (2019)
  • Author(s): Yong P. Chen
  • Organizer: CAMP (Condensed matter and Atomic/molecular physics) seminar
  • Int'l Joint Research / Invited
• [Presentation] Manipulating Dirac Cones - from twisted bilayer graphene to hybridized topological insulator (2019)
  • Author(s): Yong P. Chen
  • Organizer: CarbonHagen 2019
  • Int'l Joint Research / Invited
• [Presentation] Topological Josephson Junctions (2019)
  • Author(s): Yong P. Chen
  • Organizer: AIMR Workshop “quantum materials and spintronics --- spin, topology and superconductivity”
  • Int'l Joint Research / Invited
• [Presentation] Realization of a symmetry protected bosonic topological state in a synthetic space (2019)
  • Author(s): Yong P. Chen
  • Organizer: AIMR Workshop “quantum materials and spintronics --- spin, topology and superconductivity”
  • Int'l Joint Research / Invited
• [Presentation] Topological Josephson Junctions and Topological Superconductivity --- experimental studies of topological insulator/superconductor hybrid quantum devices (2019)
  • Author(s): Yong P. Chen
  • Organizer: Seminar at RIKEN
  • Int'l Joint Research / Invited
• [Presentation] Scanning Electrochemical Cell Microscopic Analysis for Graphite/Graphene (2019)
  • Author(s): A. Kumatani, Y. Takahashi, C. Miura, M. Shimura, H. Shiku, T. Matsue
  • Organizer: EMRS Spring Meeting
  • Int'l Joint Research
• [Presentation] Nanoscale Electrochemical Imaging on Energy Functional Materials by Scanning Electrochemical Cell Microscopy (2019)
  • Author(s): A. Kumatani
  • Organizer: EMRS Spring Meeting
  • Int'l Joint Research / Invited
• [Presentation] Determination and Initiation of Electrochemical Active Sites on Two-dimensional Material Surface by Nanoscale Electrochemical Technique (2019)
  • Author(s): A. Kumatani
  • Organizer: EMRS Fall Meeting
  • Int'l Joint Research / Invited
• [Presentation] Electrochemical imaging correlated to hydrogen evolution reaction on two-dimensional materials (2019)
  • Author(s): A. Kumatani, H. Ogawa, H. Ida, Y. Takahashi, H. Shiku, Y. P. Chen, T. Matsue
  • Organizer: ALC19
  • Int'l Joint Research
• [Presentation] Recent Progress on Electrochemical Imaging by Scanning Electrochemical Cell Microscopy (2019)
  • Author(s): A. Kumatani
  • Organizer: ICCEMT2019
  • Int'l Joint Research / Invited
• [Presentation] Electrochemical Hydrogen Evolution Reaction and Lithium-ion Transport Imaging on Energy Functional Materials (2019)
  • Author(s): A. Kumatani
  • Organizer: isCEBT2019
  • Int'l Joint Research / Invited
• [Presentation] 2次元磁性体Cr2Ge2Te6/酸化物2層膜の磁気特性 (2019)
  • Author(s): 井土宏
  • Organizer: 日本物理学会 2019年秋季大会
• [Presentation] Three new materials paradigms for solid state electronics (2019)
  • Author(s): Yong P. Chen
  • Organizer: Colloquium at Leibniz Institute/Paul-Drude-Institute for Solid State Electronics, Berlin, Germany
  • Int'l Joint Research / Invited
• [Presentation] 単層/二層WS2における水素発生反応のナノスケール電気化学イメージング (2019)
  • Author(s): 小川 寛人、熊谷 明哉、遠藤 尚彦、小林 佑、井田 大貴、高橋 康史、末永 智一 、宮田 耕充 、珠玖 仁
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] Nanoscale electrochemical imaging for hydrogen evolution reaction on WS2 mono-/bilayers (2019)
  • Author(s): Hiroto Ogawa, Akichika Kumatani, Takahiko Endo, Yu Kobayashi, Hiroki Ida, Yasufumi Takahashi, Tomokazu Matsue, Yasumitsu Miyata, Hitoshi Shiku
  • Organizer: 日本化学会99春季年会
• [Presentation] 2 次元ファンデルワールス磁性体を用いたジョセフソン接合II (2019)
  • Author(s): 井土宏
  • Organizer: 日本物理学会 2019年年次会
• [Presentation] Novel two-dimensional (2D) electron systems in topological and 2D materials: new playground for physics and devices (2018)
  • Author(s): Yong P. Chen
  • Organizer: Physics Seminar, University of Vienna, Austria
  • Int'l Joint Research / Invited
• [Presentation] What are topological insulators good for? (2018)
  • Author(s): Yong P. Chen
  • Organizer: Symposium “highlights in condensed matter physics”, Ulm, Germany
  • Int'l Joint Research / Invited
• [Presentation] How to engineer, measure and use topological quantum matter with new spins and surprises (2018)
  • Author(s): Yong P. Chen
  • Organizer: Physics Colloquium, University of Waterloo, Canada
  • Int'l Joint Research / Invited
• [Presentation] Two-pathway interference measurements in quantum matters: from quantum transport to quantum chemistry (2018)
  • Author(s): Yong P. Chen
  • Organizer: Zhong Guan Cun Forum for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
  • Int'l Joint Research / Invited
• [Presentation] What are unique and useful about topological insulators? (2018)
  • Author(s): Yong P. Chen
  • Organizer: Physics Colloquium, University of Regensburg, Germany
  • Int'l Joint Research / Invited
• [Presentation] Surface sciences and chemical processes with optical and scanning probes: some case studies (2018)
  • Author(s): Yong P. Chen
  • Organizer: Seminar at KAIST, Daejeon, South Korea
  • Int'l Joint Research / Invited
• [Presentation] What Are Unique Transport Signatures of Topological Insulators (2018)
  • Author(s): Yong P. Chen
  • Organizer: IUMRS-ICEM 2018, Daejeon, South Korea
  • Int'l Joint Research / Invited
• [Presentation] SnS2二次元薄膜における水素発生反応のナノスケール電気化学イメージング (2018)
  • Author(s): 小川寛人、熊谷明哉、上野啓司、遠藤尚彦、小林佑、宮田耕充、井田大貴、高橋康史、末永智一、珠玖仁
  • Organizer: 日本分析化学会第67年会
• [Presentation] ナノ電気化学イメージングによるグラフェン構造欠陥の検証 (2018)
  • Author(s): 志村実優、熊谷明哉、井田大貴、珠玖仁、Y. P. Chen、末永智一
  • Organizer: 第49回セミコンファレンス、第31回東北若手の会
• [Presentation] グラフェンエッジにおける電気化学活性のナノスケール電気化学イメージング (2018)
  • Author(s): 熊谷 明哉、三浦 千穂、高橋 康史、井田 大貴、珠玖 仁、末永 智
  • Organizer: 日本分析化学会 第67年会
• [Presentation] Nanoscale Electrochemical Imaging for Functional Materials (2018)
  • Author(s): Akichika Kumatani
  • Organizer: Taiwan-Nippon Workshop on Innovation of Emergent Materials
  • Int'l Joint Research / Invited
• [Presentation] Nanoscale Electrochemical Imaging for Energy Functional Materials (2018)
  • Author(s): Akichika Kumatani
  • Organizer: Japan-Taiwan Workshop on Electrochemistry JTWE
  • Int'l Joint Research / Invited
• [Presentation] Nanoscale Electrochemical Imaging by Spatially Resolved Electrochemical Microscopy: From Battery Electrodes to 2D Materials (2018)
  • Author(s): Akichika Kumatani
  • Organizer: AI-Mat seminar
  • Invited
• [Presentation] Visualization of Electrochemical Activities on 2D Materials (2018)
  • Author(s): Akichika Kumatani
  • Organizer: isCEBT2018
  • Int'l Joint Research / Invited
• [Presentation] Spatially Resolved Electrochemical Imaging on Energy Materials (2018)
  • Author(s): Akichika Kumatani
  • Organizer: nanoHUB
  • Int'l Joint Research / Invited
• [Presentation] Nanoscale Electrochemical Imaging on Energy Materials (2018)
  • Author(s): Akichika Kumatani
  • Organizer: UCL-Tohoku Partnership ‘kick-off’ workshop
  • Int'l Joint Research / Invited
• [Presentation] Nanoscale Electrochemical Imaging for Functional Energy Materials (2018)
  • Author(s): A. Kumatani, Y. P. Chen, Y. Takahashi, T. Matsue
  • Organizer: 2018 Sustainable Industrial Processing Summit & Exhibition SIPS
  • Int'l Joint Research
• [Presentation] Nanoscale Electrochemical Imaging by Scanning Electrochemical Microscopies on Energy Materials (2018)
  • Author(s): Akichika Kumatani
  • Organizer: uTAS2018
  • Int'l Joint Research / Invited
• [Presentation] 2 次元ファンデルワールス磁性体を用いたジョセフソン接合 (2018)
  • Author(s): 井土宏
  • Organizer: 日本物理学会 2018年秋季大会
• [Presentation] Effect of magnetic tunneling layer in van der Waals Josephson Junction (2018)
  • Author(s): Hiroshi Idzuchi
  • Organizer: APS March meeting 2019
  • Int'l Joint Research / Invited
• [Presentation] Effect of van der Waals magnetic tunneling layer in Josephson coupling (2018)
  • Author(s): Hiroshi Idzuchi
  • Organizer: Collaborative conference on Materials Research (CCMR) 2018
  • Int'l Joint Research / Invited
• [Presentation] Josephson coupling through atomically thin van der Waals magnet (2018)
  • Author(s): Hiroshi Idzuchi
  • Organizer: 6th “International Conference on Superconductivity and Magnetism”- ICSM2018
  • Int'l Joint Research / Invited