Evidence for 2k_F Electron-Electron Scattering Processes in Coulomb Drag

Details Evidence for 2k_F Electron-Electron Scattering Processes in Coulomb Drag Evidence for 2k_F Electron-Electron Scattering Processes in Coulomb Drag

2002-06-27

arxiv.org/abs/cond-mat/0206547v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1016/S0038-1098(02)00426-X

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.

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