Eur. Phys. J. B (2014) 87: 281
https://doi.org/10.1140/epjb/e2014-50568-3

Regular Article

Quantum transport in a driven disordered potential: onset of directed current and noise-induced current reversal

Laboratory of Nonlinear Dynamical Systems, V.I.Il’ichev Pacific Oceanological Institute of the Far-Eastern Branch of the Russian Academy of Sciences, 43 Baltiyskaya St., 690041 Vladivostok, Russia

^a e-mail: makarov@poi.dvo.ru

Received: 21 August 2014
Received in final form: 16 October 2014
Published online: 1 December 2014

Abstract

We study motion of a quantum wavepacket in a one-dimensional potential with correlated disorder. Presence of long-range potential correlations allows for existence of both localized and extended states. Weak time-dependent perturbation in the form of a fluctuating plane wave is superimposed onto the potential. This model can be realized in experiments with optically trapped cold atoms. Time-dependent perturbation causes transitions between localized and extended states. Owing to violation of space-time symmetries, there arises atomic current which is codirectional with the wave-like perturbation. However, it is shown that the perturbation can drag atoms only within some limited time interval, and then the current changes its direction. Increasing of the perturbation bandwidth and/or amplitude results in decreasing of the time of current reversal. We argue that onset of the current reversal is associated with inhomogeneity of diffusion in the momentum space.