Frictional Drag Between Coupled 2D Hole Gases in GaAs/AlGaAs Heterostructures

Details Frictional Drag Between Coupled 2D Hole Gases in GaAs/AlGaAs Heterostructures Frictional Drag Between Coupled 2D Hole Gases in GaAs/AlGaAs Heterostructures

1999-04-15

arxiv.org/abs/cond-mat/9904214v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures

Scientific paper

10.1016/S1386-9477(99)00125-3

We report on the first measurements of the drag effect between coupled 2D-hole gases. We investigate the coupling by changing the carrier densities in the quantum wells, the widths of the barriers between the gases and the perpendicular magnetic field. From the data we are able to attribute the frictional drag to phonon coupling, because the non-parabolicity allows to tune the Fermi wavevector and the Fermi velocity separately and, thereby, to distinguish between phonon- and plasmon-dominated coupling.

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