Efficiency and current reversals in spatially inhomogeneous ratchets

Details Efficiency and current reversals in spatially inhomogeneous ratchets Efficiency and current reversals in spatially inhomogeneous ratchets

1999-11-29

arxiv.org/abs/cond-mat/9911469v1

Int. J. Mod. Phys. B 14, 1585 (2000)

Physics

Condensed Matter

Soft Condensed Matter

14 pages, including 5 figures

Scientific paper

10.1142/S0217979200001291

Efficiency of generation of net unidirectional current in an adiabatically driven symmetric periodic potential system is studied. The efficiency shows a maximum, in the case of an inhomogeneous system with spatially varying periodic friction coefficient, as a function of temperature. The ratchet is not most efficient when it gives maximum current. The direction of current may also be reversed as a function of noise strength when, instead, an asymmetric periodic potential is considered.

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