Mesoscopic fluctuations of the Coulomb drag

Details Mesoscopic fluctuations of the Coulomb drag Mesoscopic fluctuations of the Coulomb drag

1999-09-09

arxiv.org/abs/cond-mat/9909133v1

Physics

Condensed Matter

4 pages, 4 eps figures

Scientific paper

10.1103/PhysRevLett.84.5383

We consider mesoscopic fluctuations of the Coulomb drag coefficient $\rho_D$
in the system of two separated two-dimensional electron gases. It is shown that
at low temperatures sample to sample fluctuations of $\rho_D$ exceed its
ensemble average. It means that in such a regime the sign of $\rho_D$ is random
and the temperature dependence almost saturates $\rho_D \sim 1/\sqrt{T}$.

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