Magneto-Optical Study of Miniband Dispersion and Excitonic Effects in GaAs/GaAlAs Superlattices

  • B. Deveaud
  • A. Chomette
  • F. Clérot
  • A. Regreny
  • R. Romestain
  • J. C. Maan
  • G. Bastard
  • Hanyou Chu
  • Yia Chung Chang
Part of the NATO ASI Series book series (NSSB, volume 206)


The luminescence excitation spectra of GaAs/GaAlAs superlattices show new structures when their period is such that the miniband width for electrons is of the order of 10 meV. The experimental spectra are remarkably reproduced by theoretical calculations, and we are then able to give an assignement to these structures. In particular, new excitonic transitions are observed which might be the equivalent of saddle-point excitons. We have performed excitation studies under magnetic field in both Faraday and Voigt configurations in order to check the different attributions. Confirmation of the excitonic character of the new peaks is obtained. When the superlattice period decreases, the exciton binding energy is observed to decrease and the miniband width to increase.


Landau Level Exciton Binding Energy Luminescence Excitation Spectrum Excitonic Line Superlattice Period 
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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • B. Deveaud
    • 1
  • A. Chomette
    • 1
  • F. Clérot
    • 1
  • A. Regreny
    • 1
  • R. Romestain
    • 2
  • J. C. Maan
    • 3
  • G. Bastard
    • 4
  • Hanyou Chu
    • 5
  • Yia Chung Chang
    • 5
  1. 1.LAB/OCMC.N.E.T.LannionFrance
  2. 2.Laboratoire de Spectrométrie PhysiqueUSMGGrennobleFrance
  3. 3.Max Planck Inst.GrenobleFrance
  4. 4.E.N.S.ParisFrance
  5. 5.University of IllinoisUrbanaUSA

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