Mesoscopic fluctuations of Coulomb drag between quasi-ballistic 1D-wires

Details Mesoscopic fluctuations of Coulomb drag between quasi-ballistic 1D-wires Mesoscopic fluctuations of Coulomb drag between quasi-ballistic 1D-wires

2001-08-16

arxiv.org/abs/cond-mat/0108263v2

Phys. Rev. B 65, 085317 (2002) .

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages including 7 figures. Minor changes according to referee report. Accepted for PRB

Scientific paper

10.1103/PhysRevB.65.085317

Quasiballistic 1D quantum wires are known to have a conductance of the order of 2e^2/h, with small sample-to-sample fluctuations. We present a study of the transconductance G_12 of two Coulomb-coupled quasiballistic wires, i.e., we consider the Coulomb drag geometry. We show that the fluctuations in G_12 differ dramatically from those of the diagonal conductance G_ii: the fluctuations are large, and can even exceed the mean value, thus implying a possible reversal of the induced drag current. We report extensive numerical simulations elucidating the fluctuations, both for correlated and uncorrelated disorder. We also present analytic arguments, which fully account for the trends observed numerically.

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