Babak K. Deceleration of charged particles in two-dimensional conductors with impurity electron state

The probing of solids bodies by beams of charged particles is used for studying of one-particle and collective excitations in two-dimensional conductors with impurity by atoms. The localization of electrons on impurities is taken into account. The losses of energies of particles in conductors stipulated by one-particle excitations and plasma waves are calculated. It is shown, that the localization of electrons leads to decrease of frequency of two-dimensional plasmons. As a result the maximum of differential cross section of scattering of particles by two-dimensional electron gas shifts to region of small energy transfers. These effects were observed experimentally. It is made clear, how localization of electrons influences deceleration capability of two-dimensional electronic gas. The losses energy stipulated by a radiation plasmons, begin with a boundary velocity, which depends on a density of electrons