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1998 Fiscal Year Final Research Report Summary

QUANTUM TRANSPORT OF TWO-DIMENSIONAL ELECTRON SYSTEMS IN STRONG MAGNETIC FIELDS AT LOW TEMPERATURES : QUANTUM HALL EFFECT AND LOCALIZATION

Research Project

Project/Area Number 07404015
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionGAKUSHUIN UNIVERSITY

Principal Investigator

KAWAJI Shinji  GAKUSHUlN UNIVERSITY,DEPARTMENT OF PHYSICS,PROFESSOR, 理学部, 教授 (00080440)

Co-Investigator(Kenkyū-buntansha) OKAMOTO Tohru  GAKUSHUIN UNIVERSITY,DEPARTMENT OF PHYSICS,RESEARCH ASSOCIATE, 理学部, 助手 (60245371)
Project Period (FY) 1995 – 1998
Keywordsstrong magnetic field / two-dimensional electron system / quantum transport / quantum Hall effect / quantized Hall resistance / electron localization / fractional quantum Hall effect / composite fermion
Research Abstract

Results obtained on quantum Hall effect and localization in two-dimensional electron systems are followings :
1.Integer quantum Hall effect. Butterfly-type Hall bars with different width between 10 and 200 mum were made from GaAs/AIGaAs heterostructure wafers to investigate current dependences of quantized Hall resistance and dissipation at temperatures below 1 K.Collapse of the quantized Hall resistance was observed at lower current than the critical current for breakdown of dissipatioless current flow. A phenomenological model for the electronic states in a Hall bar was proposed to explain the relation between the collapse of the quantized Hall resistance and the breakdown of the quantum Hall effect.
2.Fractional quantum Hall effect. Electrical conductivity of composite fermions at the half-filled Landau level of GaAs/A1GaAs heterostructures was measured at temperatures below 1.5 K.The temperature dependence was investigated based on a recent theory of quantum correction to Drude conductivity due to mutual interaction of composite fermions
3.Localization. Temperature dependence and magnetic field dependence of diagonal resistivity of Si-MOS inversion layers in insulating phase were studied and results were explained by a model based on Aharonov-Bohm effect in exchange interaction between electrons in a Wigner solid.

  • Research Products

    (36 results)

All Other

All Publications (36 results)

  • [Publications] Takeharu Okuno: "Electron Concentration and Mobility Dependence of Breakdown of the Quantum Hall Effect" Journal of the Physical Society of Japan. 64. 1881-1884 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tohru Okamoto: "Phase Boundaries between Quantum Hall Metal and Hall Insulator in SiMOSFEET's and Many-Body Enhancement of Valley- and Zeeman-Splitting" Journal of the Physical Society of Japan. 64. 2311-2315 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tohru Okamoto: "Transformation between quantum Hall conductor and Hall insulator in Si-MOSFET's" Physical Review B. 52. 11109-11112 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Fukano: "Inter-Electron Coulomb Interaction and Disorder in the Activated Transport in Magnetic Field-Induced Insulating Phase in 2D Systems" Proc. 11th Int. Conf. on High Magnetic Fields in Physics of Semiconductors ed. D. Heiman(World Scientific). 440-443 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Kawaji: "Quantum Hall effect in GaAs/AlGaAs heterostructures:Its breakdown due to current" Institute of Physics Conference Series. 145. 893-898 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tohru Okamoto: "Possible Ring-Exchange Interaction and Aharaonov-Bohm Effect in Two-Dimensional Electron Solids" Journal of the Physical Society of Japan. 65 12. 3716-3719 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Kawaji: "Quantum Hall effect : its breakdown at high currents" Physica B. 216. 393-395 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Kawaji: "Breakdown of the integer quantum Hall effect at high currents in GaAs/AlGaAs heterostructures" Journal of Semiconductor Science and Technology. 11 11S. 1546-1551 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Kawaji: "Breakdown of the Quantum Hall Effect at High Currents" Proc. 12th Int. Conf. on High Magnetic Fields in Physics of Semicond. ed. G. Landwehr&W.Ossau(World Scientific). Vol. 1. 147-156 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tohru Okamoto: "Ring-Exchange Interaction Among Strongly Localized Electrons in SiMOSFETS" Proc. 12th Int .Conf. on High Magnetic Fields in Physics of Semicond. ed. G. Landwehr&W. Ossau(World Scientific). Vol. 1. 367-370 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinji Kawaji: "Collapse of Quantized Hall Resistance and Breakdown of IQHE in GaAs/AlGaAs Heterostructures" Journal of the Physical Society of Japan. 67 4. 1110-1113 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tohru Okamoto: "Magnetism in a Wigner solid and the Aharonov-Bohm effect : Experiment and theory" Physical Review B. 57 15. 9097-9107 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tohru Okamoto: "Magnetism in a Wigner solid and the Aharonov-Bohm effect" Physica B. 249-251. 61-64 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Masahide Yokoi: "Breakdown of the integer quantum Hall effect studies by Corbino Discs" Physica B. 249-251. 93-96 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takako Shimada: "Hall effectric field-dependent broadening of extended state bands in Landau levels and breakdown of the quantum Hall effect" Physica B. 249-251. 107-110 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinji Kawaji: "Collapse of quantized Hall resistance at high Hall electric fields" Physica B. 256-258. 56-59 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tohru Okamoto: "Spin Degree of Freedom in a Two-Dimensional Electron Liquid" Physical Review Letters. to be published. (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ryoki Jahana: "Transport Properties of the Half Filled Landau level in GaAs/AlGaAs Heterostructures : Temperature Dependence of Electrical Conductivity and Magnetoresistance of Composite Fermions" Journal of the Physical Society of Japan. to be submitted.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeharu Okuno: "Electron Concentration and Mobility Dependence of Break-down of the Quantum Hall Effect" Journal of the Physical Society of Japan. 64. 1881-1884 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tohru Okamoto: "Phase Boundaries between Quantum Hall Metal and Hall Insulator in Si-MOSFET's and Many-Body Enhancement of Valley-and Zeeman-Splitting" Journal of the Physical Society of Japan. 64. 2311-2315 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tohru Okamoto: "Transformation between quantum Hall conductor and Hall insulator in Si-MOSFET's" Physical Review B. 52. 11109-11112 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Fukano: "Inter-Electron Coulomb Interaction and Disorder in the Activated Transport in Magnetic Field-Induced Insulating Phase in 2D Systems" Proc.11th Int.Conf.on High Magnetic Fields in Physics of Semiconductors ed. D.Heiman (World Scientific). 440-443 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Kawaji: "Quantum Hall effect in GaAs/AlGaAs heterostructures : Its breakdown due to current" Institute of Physics Conference Series. 145. 893-898 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tohru Okamoto: "Possible Ring-Exchange Interaction and Aharaonov-Bohm Effect in Two-Dimensional Electron Solids" Journal of the Physical Society of Japan. 65,12. 3716-3719 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Kawaji: "Quantum Hall effect : its breakdown at high currents" Physica B. 216. 393-395 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Kawaji: "Breakdown of the integer quantum Hall effect at high currents in GaAs/AlGaAs heterostructures" Journal of Semiconductor Science and Technology. 11,11S. 1546-1551 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Kawaji: "Breakdown of the Quantum Hall Effect at High Currents" Proc.12th Int.Conf.on High Magnetic Fields in Physics of Semicond.ed.G.Landwehr & W.Ossau (World Scientific). Vol.1. 147-156 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tohru Okamoto: "Ring-Exchange Interaction Among Strongly Localized Electrons in Si-MOSFETS" Proc.12th Int.Conf.on High Magnetic Fields in Physics of Semicond.ed.G.Landwehr & W.Ossau (World Scientific). Vol.1. 367-370 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shinji Kawaji: "Collapse of Quantized Hall Resistance and Breakdown of IQHE in GaAs/AlGaAs Heterostructures" Journal of the Physical Society of Japan. 67,4. 1110-1113 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tohru Okamoto: "Magnetism in a Wigner solid and the Aharonov-Bohm effect : Experiment and theory" Physical Review B. 57,15. 9097-9107 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tohru Okamoto: "Magnetism in a Wigner solid and the Aharonov-Bohm effect" Physica B. 249-251. 61-64 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masahide Yokoi: "Breakdown of the integer quantum Hall effect studied by Corbino Discs" Physica B. 249-251. 93-96 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takako Shimada: "Hall electric field-dependent broadening of extended state bands in Landau levels and breakdown of the quantum Hall effect" Physica B. 249-251. 107-110 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shinji Kawaji: "Collapse of quantized Hall resistance at high Hall electric fields" Physica B. 256-258. 56-59 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tohru Okamoto: "Spin Degree of Freedom in a Two-Dimensional Electron Liquid" Physical Review Letters. (to be published). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ryoki Jahana: "Transport Properties of the Half Filled Landau level in GaAs/AlGaAs Heterostructures : Temperature Dependence of Electrical Conductivity and Magnetoresistance of Composite Fermions" Journal of the Physical Society of Japan. (to be submitted).

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

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Published: 1999-12-08  

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