Noise-induced quantum transport

TL;DR

This paper investigates how external correlated noise influences quantum transport in nonlinear systems, revealing quantum effects that enhance current at low temperatures and suggesting experimental setups in superionic conductors.

Contribution

It introduces a detailed analysis of quantum transport under correlated noise, highlighting quantum contributions and potential experimental realizations.

Findings

Quantum effects enhance classical current at low temperatures.

Differences between quantum and classical transport diminish at higher temperatures.

Quantum diffusion and potential corrections depend on temperature, noise correlation, and system asymmetry.

Abstract

We analyze the problem of directed quantum transport induced by external exponentially correlated telegraphic noise. In addition to quantum nature of the heat bath, nonlinearity of the periodic system potential brings in quantum contribution. We observe that quantization, in general, enhances classical current at low temperature, while the differences become insignificant at higher temperature. Interplay of quantum diffusion and quantum correction to system potential is analyzed for various ranges of temperature, correlation time and strength of external noise and asymmetry parameters. A possible experimental realization of the observed quantum effects in a superionic conductor placed in a random asymmetric dichotomous electric field has been suggested.