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

Driving Particle Current through Narrow Channels Using a Classical Pump