Plasmons in disordered, two-component, quasi-two-dimensional electron systems

Abstract

The authors investigate the effect of elastic scattering of electrons on the properties of plasmons in a disordered, two-component, quasi-two-dimensional electron gas. Numerical results are given for dispersion relations and lifetimes of optical and acoustical plasmons, and for the dynamical structure factor. Acoustical plasmons are destroyed at long wavelength and exist only above a critical wave number qc, which depends strongly on electron-impurity scattering rates