Abstract
The density of states of a quasi two dimensional electron gas in magnetic fields up to 25 T is determined directly from photoluminescence measurements and can be described by Gaussian broadened Landau levels superimposed on a constant background. A model for electron - acoustic phonon scattering is presented to explain the observed filling factor (ν) dependence of the width of the partially filled first Landau level Γ 1, while it is suggested that the ν dependence of the width of the completely filled zeroth Landau level Γ 0 can be attributed to long range impurity scattering. Finally, the background is found to be independent of ν and is assumed to have the same origin as Γ 0 because of the resemblance in their dependence on electron temperature.
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