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

Karsten Flensberg and Ben Yu-Kuang Hu
Phys. Rev. Lett. 73, 3572 – Published 26 December 1994
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Abstract

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 T0.2TF (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 T0.2TF. Other experimental signatures of the plasmon-dominated drag rate are a d3 dependence on the well separation d and a peak as a function of relative densities at matched Fermi velocities.

  • Received 10 June 1994

DOI:https://doi.org/10.1103/PhysRevLett.73.3572

©1994 American Physical Society

Authors & Affiliations

Karsten Flensberg and Ben Yu-Kuang Hu

  • Mikroelektronik Centret, Danmarks Tekniske Universitet, Bygning 345ø, DK-2800 Lyngby, Denmark

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Vol. 73, Iss. 26 — 26 December 1994

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