• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Investigation of the Macro Coherence in Bilayer Quantum Hall State by Micro Wave

Research Project

Project/Area Number 14340088
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionKYOTO UNIVERSITY (2004)
Tohoku University (2002-2003)

Principal Investigator

SAWADA Anju  KYOTO UNIVERSITY, Research Center for Low Temperature and Materials Sciences, Professor, 低温物質科学研究センター, 教授 (90115577)

Co-Investigator(Kenkyū-buntansha) EZAWA Zyun F.  Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (90133925)
NAKAJIMA Tatsuya  Tohoku University, Graduate School of Science, Assistant Professor, 大学院・理学研究科, 助手 (70281962)
KUMADA Norio  Nippon Telegraph and Telephone Corporation, NTT Basic Research Laboratories, Researcher, 量子物性研究部, 研究員
SUZUKI Kastuhiko  Miyagi National College of Technology, Professor, 総合科学系数理科, 教授 (80187715)
HIRAYAMA Yoshio  Nippon Telegraph and Telephone Corporation, NTT Basic Research Laboratories, Executive Manager, 量子物性研究部, 部長
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥15,700,000 (Direct Cost: ¥15,700,000)
Fiscal Year 2004: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2003: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2002: ¥7,000,000 (Direct Cost: ¥7,000,000)
KeywordsQuantum Hall Effect / Composite Boson / Composite Fermion / Interlayer Coherence / Activation Energy / Gallium Arsenide / Pseudospin / Spin
Research Abstract

We investigated interlayer coherence of the bilayer quantum Hall states. The microwave cryostat was constructed for measurement of Josephson plasmon and then the experiments were done at 2 K. The quantum Hall effects were clearly observed, but Josephson plasmon was not observed. The cause we cannot observe Josephson plasmon is due to the low quality of the sample and the higher temperature. We will soon improve the experimental way to detect Josephson plasmon. The other hand, we get important experimental results for interlayer coherence from transport.
(1) : We study a pseudospin (layer degree of freedom) domain structure in bilayer v=1 quantum Hall states by detailed transport measurements in tilted magnetic fields. We find that the magnetoresistance R_<xx> shows a broad peak at the commensurate-incommensurate transition. An extrapolated value of R_<xx> at the peak down to 0 K is finite, showing the existence of a dissipative ground state. From the comparison of B_<//> dependence of R_<xx> and activation energy with theories, we suggest that the origin of the dissipation is pseudospin domain walls in the soliton lattice. This is the first observation in the quantum Hall state that a resistance peak is induced not by the crossing of two Landau levels, but possibly by a number of pseudospin domains, i.e., interlayer phase twists.
(2) : We examine an anisotropic transport in a bilayer system around the quantum Hall state at the total Landau level filling factor v=1. We find that the anisotropy becomes remarkable at the phase transition point between the commensurate and incommensurate states. This results that a unidirectional state appears around the transition.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (29 results)

All 2004 2003 2002 Other

All Journal Article (17 results) Publications (12 results)

  • [Journal Article] Interactions between composite fermions by a comparison of integer and fractional quantum Hall sates in bilayer systems2004

    • Author(s)
      N.Kumada
    • Journal Title

      Phys.Rev.B 69

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of In-plane Magnetic Fields on Spin Transitions in Bilayer Quantum Hall States2004

    • Author(s)
      N.Kumada
    • Journal Title

      Physica E 22

      Pages: 36-39

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Simultaneous Excitation of Spin and Pseudospins in Bilayer ν=1 Quantum Hall State2004

    • Author(s)
      D.Terasawa
    • Journal Title

      Physica E 22

      Pages: 52-55

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Interactions between composite fermions by comparison of integer and fractional quantum Hall states in bilayer systems2004

    • Author(s)
      N.Kumada
    • Journal Title

      Phys.Rev.B 69

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of In-plane Magnetic Fields on Spin Transitions in Bilayer Quantum Hall States2004

    • Author(s)
      N.Kumada
    • Journal Title

      Physics E 22

      Pages: 36-39

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Simultaneous Excitation of Spin and Pseudospins in Bilayer v=1 Quantum Hall State2004

    • Author(s)
      D.Terasawa
    • Journal Title

      Physica E 22

      Pages: 52-55

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Interactions between composite fermions by a comparison of integer and fractionalquantum Hall states in bilayer systems2004

    • Author(s)
      N.Kumada
    • Journal Title

      Phys.Rev.B 69

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Microwave Cavity Perturbation Technique for Measurements of the Quantum Hall Effect2003

    • Author(s)
      V.Krasovitsky
    • Journal Title

      Cryogenics 44

      Pages: 183-186

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Continuous transformation from spin-to pseudospin-type excitation2003

    • Author(s)
      A.Sawada
    • Journal Title

      Physica E 18

      Pages: 118-119

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Continuous transformation from spin- to pseudospin-type excitation2003

    • Author(s)
      A.Sawada
    • Journal Title

      Physica E 18

      Pages: 118-119

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Phase diagram of interacting composite fermions in the bilayer ν=2/3 quantum Hall effect2002

    • Author(s)
      N.Kumada
    • Journal Title

      Physical Review Letters 89

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Phase diagram of interacting composite fermions in the bilayer v=2/3 quantum Hall effect2002

    • Author(s)
      N.Kumada
    • Journal Title

      Physical Review Letters 89

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Anisotropic magnetotransport around the v=1 bilayer quantum Hall state

    • Author(s)
      K.Iwata
    • Journal Title

      Journal of Physics and Chemistry of Solids (in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Pseudospin Domain of v=1 Double-layer Quantum Hall State near Commensurate-Incommensurate Transition

    • Author(s)
      D.Terasawa
    • Journal Title

      Journal of Physics and Chemistry of Solids (in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Anisotropic Transport On The v=1 Bilayer Quantum Hall Sysutem Under Tilted Magnetic Field

    • Author(s)
      M.Morino
    • Journal Title

      Int.J.Mod.Phys.B (in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Double Magnetoresistance Minima Induced by The In-plane Magnetic Field For The v=1 Double-Layer Quantum Hall State

    • Author(s)
      D.Terasawa
    • Journal Title

      Int.J.Mod.Phys.B (in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] In-plane field induced anisotropy of the longitudinal resistance in a bilayer quantum Hall system

    • Author(s)
      M.Morino
    • Journal Title

      AIP Conference Proceedings (in press)

    • Related Report
      2004 Annual Research Report
  • [Publications] A.Sawada: "Continuous transformation from spin- to pseudospin-type excitation"Physica E. 18. 118-119 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] V.Krasovitsky: "Microwave Cavity Perturbation Technique for Measurements of the Quantum Hall Effect"Cryogenics. 44. 183-186 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] N.Kumada: "Effects of In-plane Magnetic Fields on Spin Transitions in Bilayer Quantum Hall States"Physica E. (in press).

    • Related Report
      2003 Annual Research Report
  • [Publications] D.Terasawa: "Simultaneous Excitation of Spin and Pseudospins in Bilayer ν=1 Quantum Hall State"Physica E. (in press).

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Shimoda: "Excitation Spectrum of Bilayer ν=2 Quantum Hall Systems"Physica E. (in press).

    • Related Report
      2003 Annual Research Report
  • [Publications] N.Kumada: "Interactions between composite fermions by a comparison of integer and fractional quantum Hall states in bilayer systems"Physical Review b. (in press).

    • Related Report
      2003 Annual Research Report
  • [Publications] A.Sawada: "Continuous transformation from spin-to pseudospin-type excitation"Physica E. (to be published). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Z.F.Ezawa: "Integer and fractional quantum Hall effects in bilayer electron systems"Journal of Physics and Chemistry of Solids. 63. 1289-1296 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] N.Kumada: "Phase diagram of interacting composite fermions in the bilayer ν=2/3 quantum Hall effect"Physical Review Letters. 89. 116802-1-116802-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Z.F.Ezawa: "SU(4) quantum coherence and interlayer tunneling in bilayer quantum Hall systems"Physica E. 12. 24-27 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] N.Kumada: "Various phase transitions in ν=2/3 bilayer quantum Hall states"Physica E. 12. 32-35 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hasebe K: "Grassmannian fields and doubly enhanced Skyrmions in the bilayer quantum Hall system at nu=2"Physical Review B. 66. 155318-1-155318-12 (2002)

    • Related Report
      2002 Annual Research Report

URL: 

Published: 2002-04-01   Modified: 2020-05-15  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi