Cyclotron Resonance Observation of Heavy and Light Spin Subbands in an Ultra-High Mobility 2D Hole Gas in GaAs/(Al,Ga)As: Evidence for Coupled Magnetoplasmons and Many Body Effects

  • B. E. Cole
  • S. O. Hill
  • A. Polisskii
  • Y. Imanaka
  • Y. Shimamoto
  • J. Singleton
  • J. M. Chamberlain
  • N. Miuri
  • M. Henini
  • T. Cheng
  • P. Goy

Abstract

Many-body effects may be conveniently studied in the two dimensional hole system (2DHS) formed in a GaAs/(Al,Ga)As heterostructure. This 2DHS exhibits extreme valence subband non-parabolicity and a large zero-field splitting of the dispersion relationships of the two spin projections1. In consequence, a complex cyclotron resonance (CR) spectrum might be expected2. However, the experimental study of CR in this Communication shows that such a complex spectrum is in fact absent in most cases. This absence is discussed in terms of a collective cyclotron motion due to Coulomb interactions between holes. Additional evidence for such a collective motion effect is provided by the observation of a very strong temperature dependence of the apparent CR position.

Keywords

GaAs 

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Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • B. E. Cole
    • 1
  • S. O. Hill
    • 2
  • A. Polisskii
    • 2
  • Y. Imanaka
    • 3
  • Y. Shimamoto
    • 3
  • J. Singleton
    • 2
  • J. M. Chamberlain
    • 1
  • N. Miuri
    • 3
  • M. Henini
    • 1
  • T. Cheng
    • 1
  • P. Goy
    • 4
  1. 1.Department of PhysicsUniversity of NottinghamNottinghamUK
  2. 2.Department of PhysicsUniversity of Oxford, The Clarendon LaboratoryOxfordUK
  3. 3.Institute for Solid State PhyicsUniversity of TokyoTokyoJapan
  4. 4.Laboratoire de Physique de l’École Normale SupérieureParis Cédex 05France

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