Pedro J. Martínez, Ricardo Chacón
We show that directed ratchet transport of a driven overdamped Brownian particle subjected to a spatially periodic and symmetric potential can be reliably controlled by tailoring a biharmonic temporal force, in accordance with the degree of symmetry breaking mechanism. We demonstrate that the effect of finite temperature on the purely deterministic ratchet scenario can be understood as an effective noise-induced change of the potential barrier which is in turn controlled by the degree of symmetry breaking mechanism. Additionally, a possible experimental realization of the present ratchet scenario is proposed in the context of a nanoscale ratchet composed of a pinion and a rack coupled via the lateral Casimir force.
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http://arxiv.org/abs/1211.6865
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