1993/04/01 by Lian Zheng, A. H. MacDonald · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevb.48.8203
17 pages, revtex, iucm93-004
arxiv created 1993/04/01 · arxiv updated 2009/11/30
We derive and evaluate expressions for the frictional Coulomb drag between disordered two-dimensional electron gas layers. Our derivation is based on the memory-function formalism and the expression for the drag reduces to previously known results in the ballistic limit. We find that Coulomb drag is appreciably enhanced by disorder at low temperatures when the mean-free-path within a layer is comparable to or shorter than the layer separation. In high mobility two-dimensional electron gas systems, where the drag has been studied experimentally, the effect of disorder on the drag is negligible at attainable temperatures. We predict that an enhancement due to disorder and a crossover in the temperature-dependence and layer-separation dependence will be observable at low temperatures in moderate and low mobility samples.