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2001 Fiscal Year Final Research Report Summary

Magnetism and metal-insulator transition in two-dimensional electron systems formed in semiconductor interfaces

Research Project

Project/Area Number 10203210
Research Category

Grant-in-Aid for Scientific Research on Priority Areas (B)

Allocation TypeSingle-year Grants
Research InstitutionUniversity of Tokyo (2000-2001)
Gakushuin University (1998-1999)

Principal Investigator

OKAMOTO Tohru  University of Tokyo, Department of Physics, Graduate School of Science, Assistant Professor, 大学院・理学系研究科, 助教授 (60245371)

Co-Investigator(Kenkyū-buntansha) KAWAJI Shinji  Gakushuin University, Department of Physics, Faculty of Science, Professor, 理学部, 教授 (00080440)
Project Period (FY) 1998 – 2000
Keywordstwo-dimensional electron systems / metal-insulator transition / electron correlation / Wigner solid / magnetoresistance
Research Abstract

We have studied electronic states and magnetic states in strongly correlated two-dimensional electron systems formed in Si-MOSFETs and Si/SiGe heterostructures.
1) We have measured the spin susceptibility as a function of the correlation parameter rs. The spin susceptibility monotonically increases with rs.
2) We found that the magnetoresistance in parallel magnetic fields is mainly caused by the spin polarization.
3) We observed the metallic phase even in the completely spin polarized system for a Si/SiGe heterostructure sample.
4) We have observed oscillations of the diagonal resistivity associated with the concentration of electrons having an up-spin.
5) We have established the process of making field-effect-transistor samples.
6) For comparison, we have investigated on the insulating phase in two-dimensional electron systems formed in GaAs/AlGaAs field-effect-transistor device, where the electron correlations are much weaker those in the silicon systems.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] T.Okamoto, S.Kawaji: "Magnetism in a Wigner solid and Aharonov-Bohm effect:Experiment and theory"Physical Review B. 57. 9097-9107 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Okamoto, K.Hosoya, S.Kawaji, A.Yagi: "Spin Degree of Freedom in a Two-Dimensional Electron Liquid"Physical Review Letters. 82. 3875-3878 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Okamoto, K.Hosoya, S.Kawaji, A.Yagi, A.Yutani, Y.Shiraki: "Metal-Insulator Transition and Spin Degree of Freedom in Silicon 2D Electron Systems"Physica E. 6. 260-263 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岡本徹, 川路紳治: "ウィグナー固体の磁性とアハラノフ・ボーム効果"固体物理. 33. 447-455 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岡本徹: ""電子の固体"の磁性とアハラノフ・ボーム効果"パリティ. 10月号. 57-59 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Okamoto and S. Kawaji: "Magnetism in a Wigner solid and Aharonov-Bohm effect : Experiment and theory"Physical Review B. 57. 9097-9107 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Okamoto, K. Hosoya, S. Kawaji and A. Yagi: "Spin Degree of Freedom in a Two-Dimensional Electron Liquid"Physical Review Letters. 82. 3875-3878 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Okamoto, K. Hosoya, S. Kawaji, A. Yagi, A. Yutani and Y. Shiraki: "Metal-Insulator Transition and Spin Degree of Freedom in Silicon 2D Electron Systems"Physica E. 6. 260-263 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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