Subbands and Landau levels in the two-dimensional hole gas at the GaAs-AlxGa1-xAs interface.

Ekenberg U., Altarelli M.

The hole subbands and Landau levels in the inversion layer at the interface between GaAs and p-type AlxGa1-xAs are calculated self-consistently in the Hartree approximation. The degenerate valence-band structure and the matching of the wave function at the interface are taken into account. Without magnetic field the authors calculate the subband dispersion parallel to the interface. The subbands are found to be strongly nonparabolic and spin split. The calculated classical cyclotron effective masses do not agree very well with those found in cyclotron resonance experiments. They have therefore included the magnetic field in the calculation. The B dependence of the Landau levels is found to be strongly nonlinear. The calculated transition energies are partly in very good agreement with experiment. The dependence of the results on areal hole density, doping concentrations, valence-band discontinuity, etc., is also investigated.

Physical Review B, 32 3712-22, 1985.

Max-Planck Institut für Festkörperforschung;
Postfach 80 06 65   D-70506 Stuttgart