Evidence for 2k_F Electron-Electron Scattering Processes in Coulomb Drag
arXiv:cond-mat/0206547 · doi:10.1016/S0038-1098(02)00426-X
Abstract
Measurements and calculations of Coulomb drag between two low density, closely spaced, two-dimensional electron systems are reported. The experimentally measured drag exceeds that calculated in the random phase approximation by a significant, and density dependent, factor. Studies of the dependence of the measured drag on the difference in density between the two layers clearly demonstrate that previously ignored q=2k_F scattering processes can be very important to the drag at low densities and small layer separations.
5 pages, 5 figures