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New approach to the physics of two dimensional electron systems

Research Project

Project/Area Number 21244047
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics I
Research InstitutionThe University of Tokyo

Principal Investigator

OKAMOTO Tohru  東京大学, 理学(系)研究科(研究院), 准教授 (60245371)

Co-Investigator(Renkei-kenkyūsha) MASUTOMI Ryuichi  東京大学, 大学院理学系研究科, 助教 (00397027)
Project Period (FY) 2009-04-01 – 2013-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥46,930,000 (Direct Cost: ¥36,100,000、Indirect Cost: ¥10,830,000)
Fiscal Year 2012: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2011: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2010: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2009: ¥27,040,000 (Direct Cost: ¥20,800,000、Indirect Cost: ¥6,240,000)
Keywords表面・界面 / 低温物性 / 表面物性 / 表面・界面物性 / 半導体物性 / 強相関電子系
Research Abstract

We study magnetotransport in a high-mobility Si two-dimensional electron system by in situ tilting of the sample relative to the magnetic field. A pronounced dip in the longitudinal resistivity is observed during the Landau-level crossing process for noninteger filling factors. This indicates that electrons in the relevant Landau levels become localized at the coincidence.
Cyclotron resonance of two-dimensional electrons is studied at low temperatures for a high-mobility Si/SiGe which exhibits a metallic temperature dependence of dc resistivity. The relaxation time shows a negative temperature dependence, which is similar to that of the transport scattering time.
Two-dimensional (2D) superconductivity was studied by magnetotransport measurements on single-atomic-layer Pb films on a cleaved GaAs surface. The results are explained in terms of an inhomogeneous superconducting state predicted for 2D metals with a large Rashba spin splitting.

Report

(5 results)
  • 2013 Final Research Report ( PDF )
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (36 results)

All 2014 2013 2012 2011 2010 2009 Other

All Journal Article (16 results) (of which Peer Reviewed: 16 results) Presentation (14 results) (of which Invited: 1 results) Book (1 results) Remarks (5 results)

  • [Journal Article] Two-Dimensional Superconducting State of Monolayer Pb Films Grown on GaAs(110) in a Strong Parallel Magnetic Field2013

    • Author(s)
      T. Sekihara, R. Masutomi, and T. Okamoto
    • Journal Title

      Physical Review Letters

      Volume: 111 Issue: 5 Pages: 5700-5700

    • DOI

      10.1103/physrevlett.111.057005

    • Related Report
      2013 Final Research Report 2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Low-Temperature Scanning Tunneling Microscopy and Transport Measurements on Adsorbate-Induced Two-Dimensional Electron Systems2013

    • Author(s)
      R. Masutomi, N. Toriyama, T. Okamoto
    • Journal Title

      AIP Conference Proceedings

      Volume: 1566 Pages: 291-291

    • DOI

      10.1063/1.4848400

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Temperature, electron density and in-plane magnetic field dependence of cyclotron relaxation time in the two-dimensional metallic phase2013

    • Author(s)
      R. Masutomi, T. Chiba, K. Sasaki, I. Yasuda, A. Sekine, K. Sawano, Y. Shiraki, T. Okamoto
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 456 Pages: 12027-12027

    • DOI

      10.1088/1742-6596/456/1/012027

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Magnetic-field-independent superconductivity of ultrathin Pb films on cleaved GaAs surface2013

    • Author(s)
      T. Sekihara, R. Masutomi, and T. Okamoto
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 456 Pages: 12034-12034

    • DOI

      10.1088/1742-6596/456/1/012034

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] In-plane magnetic field dependence of cyclotron relaxation time in a Si two-dimensional electron system2012

    • Author(s)
      T. Chiba, R. Masutomi, K. Sawano, Y. Shiraki, and T. Okamoto
    • Journal Title

      Physical Review B

      Volume: 86 Issue: 4 Pages: 45310-45310

    • DOI

      10.1103/physrevb.86.045310

    • Related Report
      2013 Final Research Report 2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Magnetotransport in adsorbate-induced two-dimensional electron systems on cleaved InAs surfaces2011

    • Author(s)
      T. Okamoto, T. Mochizuki, M. Minowa, K. Komatsuzaki, and R. Masutomi
    • Journal Title

      Journal of Applied Physics

      Volume: 109 Issue: 10 Pages: 102416-102416

    • DOI

      10.1063/1.3578263

    • Related Report
      2013 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Metallic Behavior of Cyclotron Relaxation Time in Two-Dimensional Systems2011

    • Author(s)
      R. Masutomi, K. Sasaki, I. Yasuda, A. Sekine, K. Sawano, Y. Shiraki, and T. Okamoto
    • Journal Title

      Physical Review Letters

      Volume: 106 Issue: 19 Pages: 196404-196404

    • DOI

      10.1103/physrevlett.106.196404

    • Related Report
      2013 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cyclotron resonance in the two-dimensional metallic phase of Siquantum wells2011

    • Author(s)
      R.Masutomi, K.Sasaki, I.Yasuda, A.Sekine, K.Sawano, Y.Shiraki, T.Okamoto
    • Journal Title

      AIP Conference Proceedings

      Volume: 334 Pages: 012057-012057

    • DOI

      10.1088/1742-6596/334/1/012057

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cyclotron Resonance of Two Dimensional Electrons near the Metal-Insulator Transition2011

    • Author(s)
      R.Masutomi, K.Sasaki, I.Yasuda, A.Sekine, K.Sawano, Y.Shiraki, T.Okamoto
    • Journal Title

      AIP Conference Proceedings

      Volume: 1399 Pages: 277-278

    • DOI

      10.1063/1.3666361

    • Related Report
      2011 Annual Research Report 2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Magnetotransport in adsorbate-induced twodimensional electron systems on cleaved InAs surfaces2011

    • Author(s)
      T.Okamoto, T.Mochizuki, M.Minowa, K.Komatsuzaki, R.Masutomi
    • Journal Title

      Journal of Applied Physics

      Volume: (掲載確定)

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Optical Hall Effect in the Integer Quantum Hall Regime2010

    • Author(s)
      Y.Ikebe, T.Morimoto, R.Masutomi, T.Okamoto, H.Aoki, R.Shimano
    • Journal Title

      Physical Review Letters

      Volume: 104

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cyclotron resonance of two-dimensional electrons in a Si quantum well2010

    • Author(s)
      R.Masutomi, K.Toyama, K.Sasaki, K.Sawano, Y.Shiraki, T.Okamoto
    • Journal Title

      Physica E 42

      Pages: 1184-1187

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Well-width dependence of valley splitting in Si/SiGe quantum wells2009

    • Author(s)
      K. Sasaki, R. Masutomi, K. Toyama, K. Sawano, Y. Shiraki, and T. Okamoto
    • Journal Title

      Applied Physics Letters

      Volume: 95 Issue: 22 Pages: 222109-222109

    • DOI

      10.1063/1.3270539

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Insulating phases induced by crossing of partially filled Landau levels in a Si quantum well2009

    • Author(s)
      T. Okamoto, K. Sasaki, K. Toyama, R. Masutomi, K. Sawano, and Y. Shiraki
    • Journal Title

      Physical Review B

      Volume: 79 Issue: 24

    • DOI

      10.1103/physrevb.79.241302

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Insulating phases induced by crossing of partially filled Landau levels in a Si quantum well2009

    • Author(s)
      T.Okamoto, K.Sasaki, K.Toyama, R.Masutomi, K.Sawano, Y.Shiraki
    • Journal Title

      Physical Review B 79

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Well-width dependence of valley splitting in Si/SiGe quantum wells2009

    • Author(s)
      K.Sasaki, R.Masutomi, K.Toyama, K.Sawano, Y.Shiraki, T.Okamoto
    • Journal Title

      Applied Physics Letters 95

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Presentation] Two-dimensonal superconductivity with broken inversion symmetry in one-atomic-layer metal films on cleaved GaAs surfaces2014

    • Author(s)
      T. Sekihara, T. Miyake, H. Ichinomiya, R. Masutomi, and T. Okamoto
    • Organizer
      The March Meeting 2014 of the American Physical Society
    • Place of Presentation
      Denver, USA
    • Related Report
      2012 Annual Research Report
  • [Presentation] Two-dimensonal superconductivity with broken inversion symmetry in one-atomic-layer metal films on cleaved GaAs surfaces2013

    • Author(s)
      T. Sekihara, T. Miyake, H. Ichinomiya, R. Masutomi, and T. Okamoto
    • Organizer
      The International Conference on Strongly Correlated Electron Systems
    • Place of Presentation
      Tokyo, Japan
    • Related Report
      2012 Annual Research Report
  • [Presentation] STM/STS and transport measurements in adsorbate-induced two-dimensional electron systems2013

    • Author(s)
      R. Masutomi and T. Okamoto
    • Organizer
      International Symposium on Advanced Nanodevices and Nanotechnology
    • Place of Presentation
      Hawaii, USA
    • Related Report
      2012 Annual Research Report
  • [Presentation] Strongly correlated two-dimensional system and superconductivity in one atomic layer2013

    • Author(s)
      R. Masutomi
    • Organizer
      Yonsei-Todai Symposium
    • Place of Presentation
      Tokyo, Japan
    • Related Report
      2012 Annual Research Report
  • [Presentation] Magnetic-field-independent superconductivity of ultrathin Pb films on cleaved GaAs surface2012

    • Author(s)
      T.Sekihara, R. Masutomi, and T. Okamoto
    • Organizer
      20th International Conference on High Magnetic Fields in Semiconductor Physics
    • Place of Presentation
      Chamonix, France
    • Related Report
      2013 Final Research Report 2012 Annual Research Report
  • [Presentation] Low-Temperature Scanning Tunneling Microscopy and Transport Measurements on Adsorbate-Induced Two-Dimensional Electron Systems2012

    • Author(s)
      R. Masutomi, N. Toriyama, T. Okamoto
    • Organizer
      31th International Conference on the Physics of Semiconductors
    • Place of Presentation
      Zurich, Switzerland
    • Related Report
      2013 Final Research Report 2012 Annual Research Report
  • [Presentation] Superconductivity of ultrathin metallic films on cleaved GaAs surfaces2012

    • Author(s)
      T. Sekihara, R. Masutomi, and T. Okamoto
    • Organizer
      The 10th Japan-Russia Seminar on Semiconductor Surfaces
    • Place of Presentation
      Tokyo, Japan
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Temperature, electron density and in-plane magnetic field dependence of cyclotron relaxation time in the two-dimensional metallic phase2012

    • Author(s)
      R. Masutomi, T. Chiba, K. Sasaki, I. Yasuda, A. Sekine, K. Sawano, Y. Shiraki and T. Okamoto
    • Organizer
      20th International Conference on High Magnetic Fields in Semiconductor Physics
    • Place of Presentation
      Chamonix, France
    • Related Report
      2012 Annual Research Report
  • [Presentation] 半導体表面における量子ホール伝導と2次元スピングラス2011

    • Author(s)
      岡本徹
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      富山大学(富山県)(招待講演)
    • Year and Date
      2011-09-21
    • Related Report
      2011 Annual Research Report
  • [Presentation] 半導体表面における量子ホール伝導と2次元スピングラス2011

    • Author(s)
      岡本 徹
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      富山大学
    • Related Report
      2013 Final Research Report
  • [Presentation] Magneto transport in adsorbate-induced twodimensional electron systems on cleaved InAs surfaces2010

    • Author(s)
      T.Okamoto, T.Mochizuki, M.Minowa, K.Komatsuzaki, R.Masutomi
    • Organizer
      30th International Conference on the Physics of Semiconductors
    • Place of Presentation
      Seoul, Korea
    • Year and Date
      2010-07-27
    • Related Report
      2010 Annual Research Report
  • [Presentation] Magnetotransport in adsorbate-induced two-dimensional electron systems on cleaved InAs surfaces2010

    • Author(s)
      T. Okamoto
    • Organizer
      The 30th International Conference on the Physics of Semiconductors
    • Place of Presentation
      Seoul, Korea
    • Related Report
      2013 Final Research Report
  • [Presentation] Cyclotron Resonance of Two Dimensional Electrons near the Metal-Insulator Transition2010

    • Author(s)
      R. Masutomi, K. Sasaki, I. Yasuda, A. Sekine, K. Sawano, Y. Shiraki, T. Okamoto
    • Organizer
      The 30th International Conference on the Physics of Semiconductors
    • Place of Presentation
      Seoul, Korea
    • Related Report
      2013 Final Research Report
  • [Presentation] Hysteresis in magnetoresistance of InAs surface inversion layers covered with submonolayer of Fe films2009

    • Author(s)
      T.Mochizuki, R.Masutomi, T.Okamoto
    • Organizer
      18th International Conference on Electronic Properties of Two-Dimensional Systems
    • Place of Presentation
      Kobe, Japan
    • Year and Date
      2009-07-23
    • Related Report
      2009 Annual Research Report
  • [Book] Electrical Detection of Electron-Spin Resonance in Two-Dimensional Systems, Series : the Topic in Applied Physics, Vol.115

    • Author(s)
      J. Matsunami and T. Okamoto
    • Publisher
      Ed. Marco Fanciulli (著書・分担執筆)
    • Related Report
      2013 Final Research Report
  • [Remarks]

    • URL

      http://dolphin.phys.s.u-tokyo.ac.jp/

    • Related Report
      2013 Final Research Report
  • [Remarks] Recent publications (Okamoto group)

    • URL

      http://dolphin.phys.s.u-tokyo.ac.jp/research/list.html

    • Related Report
      2012 Annual Research Report
  • [Remarks]

    • URL

      http://dolphin.phys.s.u-tokyo.ac.jp/

    • Related Report
      2011 Annual Research Report
  • [Remarks]

    • URL

      http://dolphin.phys.s.u-tokyo.ac.jp/

    • Related Report
      2010 Annual Research Report
  • [Remarks]

    • URL

      http://dolphin.phys.s.u-tokyo.ac.jp/

    • Related Report
      2009 Annual Research Report

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Published: 2009-04-01   Modified: 2020-05-15  

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