Transverse rectification of disorder-induced fluctuations in a driven system

Details Transverse rectification of disorder-induced fluctuations in a driven system Transverse rectification of disorder-induced fluctuations in a driven system

2006-10-23

arxiv.org/abs/cond-mat/0610618v1

Phys. Rev. B 75, 020201(R) (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4.5 pages, 3 figs

Scientific paper

10.1103/PhysRevB.75.020201

We study numerically the overdamped motion of particles driven in a two dimensional ratchet potential. In the proposed design, of the so-called geometrical-ratchet type, the mean velocity of a single particle in response to a constant force has a transverse component that can be induced by the presence of thermal or other unbiased fluctuations. We find that additional quenched disorder can strongly enhance the transverse drift at low temperatures, in spite of reducing the transverse mobility. We show that, under general conditions, the rectified transverse velocity of a driven particle fluid is equivalent to the response of a one dimensional flashing ratchet working at a drive-dependent effective temperature, defined through generalized Einstein relations.

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