Abstract
The dynamical structure factor of electrons in disordered systems is found to consist of two parts: One part is a disorder-induced elastic contribution with some form factor ${S}_{e}(\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}})$; the other one is related to the density relaxation spectrum. We evaluate ${S}_{e}(\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}})$ in perturbation theory and the density relaxation within the self-consistent current relaxation theory for two- and three-dimensional systems. For short-range potential fluctuations we find a peak in the static structure factor $S(\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}})$ at $q\ensuremath{\cong}2{k}_{F}$.
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