Driving particle current through narrow channels using classical pump

Details Driving particle current through narrow channels using classical pump Driving particle current through narrow channels using classical pump

2007-03-13

arxiv.org/abs/cond-mat/0703335v2

Phys. Rev. Lett. 99, 190601 (2007)

Physics

Condensed Matter

Statistical Mechanics

Revised version

Scientific paper

10.1103/PhysRevLett.99.190601

We study a symmetric exclusion process in which the hopping rates at two chosen adjacent sites vary periodically in time and have a relative phase difference. This mimics a colloidal suspension subjected to external space and time dependent modulation of the diffusion constant. The two special sites act as a classical pump by generating an oscillatory current with a nonzero ${\cal DC}$ value whose direction depends on the applied phase difference. We analyze various features in this model through simulations and obtain an expression for the $\cal{DC}$ current via a novel perturbative treatment.

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