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  • Title: Ratchet universality in the presence of thermal noise.
    Author: Martínez PJ, Chacón R.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2013 Jun; 87(6):062114. PubMed ID: 23848634.
    Abstract:
    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 coherence 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. Remarkably, we find that the same universal scenario holds for any symmetric periodic potential, while optimal directed ratchet transport occurs when the impulse transmitted (spatial integral over a half period) by the symmetric spatial force is maximum.
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