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 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.
Original languageUndefined/Unknown
JournalPhysical Review Letters
Issue number26
Pages (from-to)3572-3575
Publication statusPublished - 26 Dec 1994

    Research areas

  • cond-mat

ID: 41038213