Evidence for 2kF Electron-Electron Scattering Processes in Coulomb Drag
M. Kellogg, J. P. Eisenstein, L. N. Pfeiffer, K. W. West
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=2kF scattering processes can be very important to the drag at low densities and small layer separations.
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