Abstract
Transport of Brownian particles in a periodic channel coexisting with an energetic barrier is investigated in the presence of a curl-free force and a divergence-free force. It is found that the phase difference between the energetic barrier and the entropic barrier can determine the direction of transport without pressure-driven flow. The pressure-driven flow induces the negative current. When the four driving factors (the ac driving force, the pressure-driven flow, the energetic barrier, and the entropic barrier) compete with each other, the system exhibits peculiar properties. Remarkably, we can obtain multiple current reversals by suitably tailoring the system parameters.
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