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Magnetic field-induced saddle point in GaAs/AlGaAs short period superlattices

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
86
Issue
11
Identifiers
DOI: 10.1016/0038-1098(93)90175-m
Disciplines
  • Physics

Abstract

Abstract We have measured interband magneto-absorption spectra of (GaAs) 6/ ( Al 0.51 Ga 0.49 As) 6 = (6,6) and ( GaAs) 14/( AlAs) 6 = (14,6) under pulsed high magnetic fields up to 150T. In sample (6,6), drastic broadening of the exciton peak due to a magnetic field-induced saddle point was observed when high magnetic fields were applied in the direction parallel to the layer planes and the cyclotron radius became smaller than the superlattice period. The line shape of the broadened exciton resonance was qualitatively understood as an effect of the Coulomb interaction between electrons and holes. The exciton binding energy of sample (6,6) was estimated as 7.0meV using the perturbational theory, which reflects an intermediate nature of the superlattice between bulk crystals and two-dimensional quantum wells.

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