Mesoscopic fluctuations of the coulomb drag
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) approximately 1/sqrt[T].
Narozhny
BN
Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794 and Theoretische Physik III, Ruhr-Universitat Bochum, 44780 Bochum, Germany.
Aleiner
IL