Coulomb drag between disordered two-dimensional electron-gas layers

摘要: We derive and evaluate expressions for the frictional Coulomb drag between disordered two-dimensional electron-gas layers. Our derivation is based on memory-function formalism expression reduces to previously known results in ballistic limit. find that appreciably enhanced by disorder at low temperatures when mean free path within a layer comparable or shorter than separation. In high-mobility systems, where has been studied experimentally, effect of negligible attainable temperatures. predict an enhancement due crossover temperature dependence layer-separation will be observable moderate- low-mobility samples.