Density of states of a two-dimensional electron gas in a strong magnetic field

Abstract

The authors have measured the density of states in the tails of the Landau levels of GaAs-Al_xGa_1-xAs heterostructures by analysing the variation of the Fermi level position as a function of the magnetic field. The experimental data are best described by a gaussian-like density of states superimposed on a constant background density of states.