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

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

1994-06-13

arxiv.org/abs/cond-mat/9406052v1

Phys. Rev. Lett. 73, 3572 (1994).

Physics

Condensed Matter

10 pages, RevTeX 3.0, MIC-TH-2

Scientific paper

10.1103/PhysRevLett.73.3572

We show theoretically that the Coulomb drag rate between two parallel quasi-two-dimensional electron gases is substantially enhanced by the coupled acoustic and optic plasmon modes of the system at temperatures $T \gtrsim 0.2T_F$ (where $T_F$ is the Fermi temperature) for experimentally relevant parameters. The acoustic mode causes a sharp upturn in the scaled drag rate as a function of temperature at $T \approx 0.2 T_F$. Other experimental signatures of plasmon-dominated drag are a $d^{-3}$ dependence on the well separation $d$, and a peak in the drag rate as a function of relative carrier densities at matched Fermi velocities.

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