Demon-free quantum Brownian motors
Other Condensed Matter
2007-05-23 v1 Soft Condensed Matter
Statistical Mechanics
Abstract
A quantum Smoluchowski equation is put forward that consistently describes thermal quantum states. In particular, it notably does not induce a violation of the second law of thermodynamics. This so modified kinetic equation is applied to study {\it analytically} directed quantum transport at strong friction in arbitrarily shaped ratchet potentials that are driven by nonthermal two-state noise. Depending on the mutual interplay of quantum tunneling and quantum reflection these quantum corrections can induce both, either a sizable enhancement or a suppression of transport. Moreover, the threshold for current reversals becomes markedly shifted due to such quantum fluctuations.
Keywords
Cite
@article{arxiv.cond-mat/0402116,
title = {Demon-free quantum Brownian motors},
author = {L. Machura and M. Kostur and P. Hänggi and P. Talkner and J. L uczka},
journal= {arXiv preprint arXiv:cond-mat/0402116},
year = {2007}
}
Comments
4 pages 3 figures