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

TY - JOUR

T1 - Coulomb Drag as a Probe of Coupled Plasmon Modes in Parallel Quantum Wells

AU - Flensberg, Karsten

AU - Yu-Kuang Hu, Ben

PY - 1994/12/26

Y1 - 1994/12/26

N2 - 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.

AB - 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.

KW - cond-mat

U2 - 10.1103/PhysRevLett.73.3572

DO - 10.1103/PhysRevLett.73.3572

M3 - Tidsskriftartikel

C2 - 10057417

SN - 0031-9007

VL - 73

SP - 3572

EP - 3575

JO - Physical Review Letters

JF - Physical Review Letters

IS - 26

ER -