MAGNETOPLASMA WAVES IN INVERSION-LAYERS WITH LOCAL ELECTRON-STATES

The spectrum and damping factor of plasma and magnetoplasma waves in a two-dimensional electron gas at low temperatures are calculated, taki ng into account local electron states at impurity atoms. It is shown t hat localization of electrons decreases the frequency of long-wave pla smons and rearranges the magnetoplasma spectrum in the vicinity of res onant frequencies of electron transitions between the Landau levels an d local levels. As a result, the plasma absorption peak is displaced t owards low frequencies, and the magnetoplasma peak splits. The charact eristics of plasmons and magnetoplasmons are calculated for parameters of the inversion layer at the boundary between silicon and silicon di oxide. (C) 1997 American Institute of Physics. [S1063-777X(97)01111-0] .