Driving particle current through narrow channels using a classical pump |
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Authors: | Jain Kavita Marathe Rahul Chaudhuri Abhishek Dhar Abhishek |
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Affiliation: | Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot, Israel. |
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Abstract: | 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 time-dependent modulation of the local chemical potential. The two special sites act as a classical pump by generating an oscillatory current with a nonzero 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 dc current via a novel perturbative treatment. |
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