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Coulomb Drag as a Probe of Coupled Plasmon Modes in Parallel Quantum Wells

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We show theoretically that the Coulomb drag rate between two parallel quasi-two-dimensional electron gases with equal Fermi velocities is substantially enhanced by the coupled acoustic and optic plasmon modes at temperatures T≳0.2TF (where TF is the Fermi temperature) for experimentally relevant parameters. The acoustic mode causes a sharp upturn in the scaled drag rate with increasing temperature at T≈0.2TF. Other experimental signatures of the plasmon-dominated drag rate are a d−3 dependence on the well separation d and a peak as a function of relative densities at matched Fermi velocities.
TidsskriftPhysical Review Letters
Udgave nummer26
Sider (fra-til)3572-3575
StatusUdgivet - 26 dec. 1994

ID: 41038213