Abstract
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The high-frequency conductivity/resistivity of a two-dimensional quantum plasma embedded in a random distribution of impurities is calculated with the use of a semiclassical kinetic description. The plasma is drifting at speed vD relative to the impurities and the system is under the influence of an electromagnetic radiation of wave number q and frequency w. It is shown that the collisional damping rate exhibits some anomalous oscillatory behavior due to the electron fluctuations which disturb the system from thermodynamic equilibrium when vD - Fermi velocity VF. As a consequence, there exists a frequency-dependent critical velocity vc(��), above which the system behaves like a negative resistive medium. �� 1993 IOP Publishing Ltd.