Current reversal and mass separation of inertial Brownian motors in a two-noise ratchet

Chunhua Zeng, Ailing Gong and Yafang Tian

Physica A: Statistical Mechanics and its Applications, 2010, vol. 389, issue 10, 1971-1977

Abstract: Transport of an inertial Brownian motor moving in an asymmetric periodic potential driven by an external force and correlated noises is investigated. Using the numerical algorithm, the asymptotic mean velocity (AMV) for characterizing directed transport is obtained. The effects of the external driving force f and the correlation λ between the two noises on the AMV are discussed. The results manifest: (1) the external driving force and the correlation between the two noises can lead to the phenomena like current reversal. (2) The competitions among the external driving force and the correlation between the two noises are necessary for current reversal, i.e., fλ>0. (3) Different directions of transport are found for different masses of the Brownian particles under the condition fλ>0. Therefore a theoretical study is suggested for separating Brownian particles according to their different masses in the ratchet system.

Keywords: Brownian motor; Asymptotic mean velocity; Current reversal (search for similar items in EconPapers)
Date: 2010
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:389:y:2010:i:10:p:1971-1977

DOI: 10.1016/j.physa.2009.12.059

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