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)


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.


Carrier Density Landau Level High Excitation Exciton Binding Energy Luminescence Peak 
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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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