Mesoscopic fluctuations of the Coulomb drag
classification
❄️ cond-mat
keywords
fluctuationscoulombdragmesoscopicsamplealmostaveragecoefficient
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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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