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

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

References in corpus (3)

• Observation of a Linearly Dispersing Collective Mode in a Quantum Hall Ferromagnet
• Observation of Quantized Hall Drag in a Strongly Correlated Bilayer Electron System
• Frictional Drag between Two Dilute Two-Dimensional Hole Layers

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• Switching between attractive and repulsive Coulomb-interaction-mediated drag in an ambipolar GaAs/AlGaAs bilayer device
• In-plane magnetodrag in dilute bilayer two-dimensional systems: a Fermi liquid theory
• Hall Coulomb drag induced by electron-electron skew scattering
• The role of the exchange-Coulomb potential in two-dimensional electron transport
• Exchange and correlation effects on drag in low density electron bilayers: Coulomb and virtual-optical-phonon-mediated electron-electron interaction