Trapping mechanism in overdamped ratchets with quenched noise

Details Trapping mechanism in overdamped ratchets with quenched noise Trapping mechanism in overdamped ratchets with quenched noise

2007-04-28

arxiv.org/abs/0704.3817v1

Phys. Rev. E 75, 051101 (2007)

Physics

Condensed Matter

Statistical Mechanics

21 pages, 6 figures, to appear in PRE

Scientific paper

10.1103/PhysRevE.75.051101

A trapping mechanism is observed and proposed as the origin of the anomalous behavior recently discovered in transport properties of overdamped ratchets subject to external oscillatory drive in the presence of quenched noise. In particular, this mechanism is shown to appear whenever the quenched disorder strength is greater than a threshold value. The minimum disorder strength required for the existence of traps is determined by studying the trap structure in a disorder configuration space. An approximation to the trapping probability density function in a disordered region of finite length included in an otherwise perfect ratchet lattice is obtained. The mean velocity of the particles and the diffusion coefficient are found to have a non-monotonic dependence on the quenched noise strength due to the presence of the traps.

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