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Polaron Coupling in GaAs-GaAlAs Heterostructures Observed by Cyclotron and Magnetophonon Resonance

  • R. J. Nicholas
  • D. J. Barnes
  • D. R. Leadley
  • C. J. G. M. Langerak
  • J. Singleton
  • P. J. van der Wel
  • J. A. A. J. Perenboom
  • J. J. Harris
  • C. T. Foxon
Part of the NATO ASI Series book series (NSSB, volume 206)

Abstract

Cyclotron resonance has been studied for 2-D electrons in GaAs-GaAlAs heterojunctions as a function of energy and electron concentration. The strength of the resonant polaron coupling is a strong function of the 2-D carrier density indicating the importance of screening and Landau level occupancy. For low density coupling is seen to the L.O. phonons which is slightly stronger than found in bulk GaAs, and mass enhancements as large as 10% have been observed. At high carrier concentrations the resonant coupling is almost totally suppressed by the exclusion principle, when the lowest Landau level approaches full occupancy at the polaron resonance condition. At higher temperatures the polaron coupling has different temperature variations depending on the energy and carrier concentration. For high concentrations second harmonic polaron coupling could be seen.

Keywords

Carrier Concentration Effective Mass Cyclotron Resonance Optic Phonon Landau Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • R. J. Nicholas
    • 1
  • D. J. Barnes
    • 1
  • D. R. Leadley
    • 1
  • C. J. G. M. Langerak
    • 2
  • J. Singleton
    • 2
  • P. J. van der Wel
    • 2
  • J. A. A. J. Perenboom
    • 2
  • J. J. Harris
    • 3
  • C. T. Foxon
    • 3
  1. 1.Clarendon LaboratoryOxfordUK
  2. 2.High Field Magnet LaboratoryNijmegen UniversityNijmegenThe Netherlands
  3. 3.Philips Research LaboratoryRedhill, SurreyUK

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