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A Brownian pump of particles in an asymmetric finite tube is investigated inthe presence of an unbiased external force. The pumping system is bounded bytwo particle reservoirs. It is found that the particles can be pumped throughthe tube from a reservoir at low concentration to one at the same or higherconcentration. There exists an optimized value of temperature (or the amplitudeof the external force) at which the pumping capacity takes its maximum value.The pumping capacity decreases with increasing the radius at the bottleneck ofthe tube.

A channel Brownian pump powered by an unbiased external force