Abstract
Cyclotron-resonance transmission experiments were performed on an ${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As/GaAs heterostructure and compared with self-consistent calculations of the dynamical conductivity of the two-dimensional electron gas (2D EG). It is found that the dominant scatterers for filling factor \ensuremath{\nu}2 are the ionized impurities in the vicinity range of the 2D EG. A sharp step accompanied by a strong decrease of linewidth for \ensuremath{\nu}\ensuremath{\le}1 was observed for T=1.2 K and is attributed to an inhomogeneous distribution of the electrons over the sample. This is modeled in the calculations by an effective density of scatterers. The temperature-dependent measurements are explained with the basic assumption of a spatial separation between repulsive scatterers and the electrons.
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