Title:	Particle current in a symmetric exclusion process with time-dependent hopping rates
Authors:	Marathe, Rahul Jain, Kavita Dhar, Abhishek
Keywords:	driven diffusive systems (theory) stochastic particle dynamics (theory)
Issue Date:	14-Nov-2008
Publisher:	IOP Publishing Ltd.
Citation:	Journal of Statistical Mechanics: Theory and Experiment, 2008, p11014
Abstract:	In a recent study (Jain et al 2007 Phys. Rev. Lett. 99 190601), a symmetric exclusion process with time-dependent hopping rates was introduced. Using simulations and a perturbation theory, it was shown that if the hopping rates at two neighboring sites of a closed ring vary periodically in time and have a relative phase difference, there is a net DC current which decreases in inverse proportion with the system size. In this work, we simplify and generalize our earlier treatment. We study a model where hopping rates at all sites vary periodically in time, and show that for certain choices of relative phases, a DC current of order unity can be obtained. Our results are obtained using a perturbation theory in the amplitude of the time-dependent part of the hopping rate. We also present results obtained in a sudden approximation that assumes large modulation frequency.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/3751
ISSN:	1742-5468 (Online)
Alternative Location:	http://arxiv.org/abs/0809.2468 http://dx.doi.org/10.1088/1742-5468/2008/11/P11014
Copyright:	2008 IOP Publishing Ltd.
Appears in Collections:	Research Papers (TP)

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