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

Abstract

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 $T\approx 0.2T_F$. 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.

10 pages, RevTeX 3.0, MIC-TH-2

References in corpus (3)

• Coulomb drag between two-dimensional electron systems
• Coulomb drag between disordered two-dimensional electron gas layers
• The Quantum Hall Effect in Drag: Inter-layer Friction in Strong Magnetic Fields

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