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Properties of a Dense Quasi Two Dimensional Electron-Hole GAS at High Magnetic Fields

  • J. C. Maan
  • M. Potemski
  • K. Ploog
  • G. Weimann
Part of the NATO ASI Series book series (NSSB, volume 206)

Abstract

Luminescence spectra in GaAs/Gal−XAlX As quantum wells in magnetic fields show the recombination from several Landau levels, filled with optically excited electrons and holes. A comparison of this luminescence with low power absorption spectra (involving empty states) shows in detail the changes of the optical properties with electron and hole density. For densities > 1012cm−2, a decrease of the bandgap of twice the exciton binding energy, and which is independent on density is observed. Furthermore an excitonic behaviour of the ground state and a 20% enhancement of the effective mass is observed.

Keywords

Carrier Density Landau Level High Excitation Exciton Binding Energy Luminescence Peak 
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

  • J. C. Maan
    • 1
  • M. Potemski
    • 1
  • K. Ploog
    • 2
  • G. Weimann
    • 3
  1. 1.HMLMax Planck Institut für FestkörperforschungGrenoble CedexFrance
  2. 2.Max Planck Institut für FestkórperforschungStuttgart 80Germany
  3. 3.Walter Schottky InstitutTU MünchenGarchingGermany

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