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Magnetic Field induced Metal Nonmetal Transition for Semiconductors by Use of Zeeman Magneto-Spectroscopy

Research Project

Project/Area Number 08640419
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

KOBORI Hiromi  Graduate School of Science, Osaka University, Research Assistant, 大学院・理学研究科, 助手 (90202069)

Co-Investigator(Kenkyū-buntansha) FUJII Kenichi  Graduate School of Science, Osaka University, Research Assistant, 大学院・理学研究科, 助手 (10189988)
NAKATA Hiroyasu  Graduate School of Science, Osaka University, Associate Professor, 大学院・理学研究科, 助教授 (60116069)
OHYAMA Tyuzi  Graduate School of Science, Osaka University, Professor, 大学院・理学研究科, 教授 (40029715)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1996: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsMetal-Nonmetal / Magnetic / Semiconductor / Zeeman / Donor / Thomas-Fermi / Screening / Variational / 1s→2P_<+1>遷移 / 濃度広がり / GaAs
Research Abstract

To study the magnetic field induced metal-nonmetal transition for semiconductors by use of Zeeman magneto-spectroscopy, we have employed n-GaAs, which has a isotropic effective mass of the conduction band and can be fitted to the effective mass approximation. The critical donor concentration of the metal-nonmetal transition for n-GaAs is 1.6*10^<16>cm^<-3>. We have prepared more than 10 kinds of epitaxially grown n-GaAs samples of which concentration is between 10^<14>cm^<-3> and 10^<18>cm^<-3>. Zeeman magneto-absorption of donors for ls*2P_<+1> transition has been investigated in details as the functions of donor concentration, magnetic field and temperature. When the Zeeman magneto-absorption can be observed, the semiconductor is in the nonmetallic phase, and vice versa. We have observed the striking line-broadening of the Zeeman magneto-absorption with increasing the donor concentration and the disappearance of that above the critical donor concentration. Furthermore, we have observed the considerable narrowing of the Zeeman magneto-absorption with increasing the magnetic field. The shift of the critical donor concentration to a higher one and the magnetic field induced metal-nonmetal transition have been recognized on the application of the magnetic field. To explain our experimental results quantitatively, we carried out variational calculations within the Thomas-Fermi approximation and evaluated the critical donor concentration of the metal-nonmetal transition. Employing the reliable variational wavefunctions, we firstly calculated energy levels of a donor in a magnetic field without the screening and obtained the good results. We secondly carried out numerical calculations with screening and thirdly extended our calculations to the case in the presence of the magnetic field and the screening.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] H.Kobori, M.Inoue and T.Ohyama: "Far-Infrared Probing of Nonmetal-Metal Transition for n-GaAs in Magnetic Fields" 23th International Conference on Physics of Semiconductors. 1. 149-152 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Kobori and T.Ohyama: "Bound to Unbound Transition of Hydrogenic Donors in Semiconductors with a Static Screened Conlomb Potential" Journal of Physics and Chemistry of Solids. 58. 2057-2064 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Kobori and T.Ohyama: "Variational Calculation of Energy Levels associated with 1s,2p and 3d states of Hydrogenic Donors for Semiconductors in Arbitrary Magnetic Feild" Journal of Physics and Chemistry of Solids. 58. 2064-2068 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Okashita, H.Kobori and T.Ohyama: "Far-Infrared induced Resonant-Photoelectromagnetic Effects in Compound Semiconductors" 16th Electronic Materials Symposium. C12. 33-36 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Okashita, H.Kobori and T.Ohyama: "Resonant-Photoelectromagnetic Effects in Far-Infrared Regions for Compound Semiconductors" Journal of Physical Society of Japan. 67. 252-255 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Kobori, M.Inoue and T.Ohyama: "Far-Infrared Probing of Nonmetal-Metal Transition for n-GaAs in Magnetic Fields" 23th International Conference on Physics of Semicondoctors. 1. 149-153 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Kobori and T.Ohyama: "Bound to Unbound State Transition of Hydrogenic Donors in Semiconductors with a Static Screened Coulomb Potential" J.Phys.Chem.Sol.58. 2057-2064 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Kobori and T.Ohyama: "Variational Calculations of Energy Levels associated with 1s, 2p and 3d States of Hydrogenic Donors for Semiconductors in Arbitrary Magnetic Field" J.Phys.Chem.Sol.58. 2064-2068 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Okashita, H.Kobori and T.Ohyama: "Far-Infrared induced Resonant-Photoelectromagnetic Effects in Compound Semiconductors" 16th Electronic Materials Symposium. C-12. 33-36 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Okashita, H.Kobori and T.Ohyama: "Resonant-Photoelectromagnetic Effects in Far-Infrared Regions for Compound Semiconductors" J.Phys.Soc.Jpn. 67. 252-255 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Kobori and T.Ohyama: "Bound to Unbound Transition of Hydrogenic Donors in Semiconductors with a Static Screened Coulomb Potential" Journal of Physics and Chemistry of Solids. 58. 2057-2064 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.Kobori and T.Ohyama: "Variational Calculation of Energy Levels associated with 1s,2p and 3d States of Hydrogenic Donors for Semiconductors in Arbitrary Magnetic Field" Journal of Physics and Chemistry of Solids. 58. 2064-2068 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Okashita, H.Kobori and T.Ohyama: "Far-Intrared induced Resonant-Photoelectromagnetic Effects in Compound Semiconductors" 16th Electronic Materials Symposium. C12. 33-36 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Okashita, H.Kobori and T.Ohyama: "Resonant-Photoelectromagnetic Effects in Far-Infrared Regions for Compound Semiconductors" Journal of Physical Society of Japan. 67. 252-255 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.Kobori,M.Inoue and T Ohyama: "Far-Infrared Probing of Nonmetal-Metal Transition for n-GaAs in Magnetic Fields" Proceeding of 23th International Conference on Physics of Semiconductors. Vol.1. 149-152 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2020-05-15  

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