Am. Ermolaev et B. Haghighi, Deceleration of charged particles in a two-dimensional electron gas with impurity states of electrons, LOW TEMP PH, 25(6), 1999, pp. 446-452
Differential cross-section of inelastic scattering and loss function of fas
t charged particles in a two-dimensional electron gas are calculated at low
temperatures, taking into account the localization of electrons at impurit
y atoms. The contribution of one-particle and collective excitations of the
electron gas to the scattering cross-section and loss function is consider
ed. One-particle excitations are manifested in the existence of a threshold
of scattering cross-section and loss function, associated with a transitio
n of localized electrons to the conduction band. Localization of electrons
leads to a decrease in the frequency of two-dimensional plasmons. Consequen
tly, the plasma loss lines in the energy spectrum of electrons passing thro
ugh a two-dimensional electron gas are displaced towards lower frequencies
and are broadened. Numerical estimates are obtained for the inversion layer
at the boundary between silicon and silicon dioxide. (C) 1999 American Ins
titute of Physics. [S1063-777X(99)01006-3].