Brownian motors driven by noise intensity fluctuation

Details Brownian motors driven by noise intensity fluctuation Brownian motors driven by noise intensity fluctuation

2011-12-22

arxiv.org/abs/1112.5287v1

Physics

Condensed Matter

Statistical Mechanics

21 pages, 9 figures

Scientific paper

We study Brownian motors in the presence of noise-intensity fluctuations both in overdamped and underdamped regimes, and investigate effects of model parameters on the current of the motors. In the overdamped case, calculations using a matrix continued fraction method (MCFM) and Monte Carlo (MC) show that the current achieves maximum as a function of the squared variation coefficient of the noise intensity process, especially for large noise-intensity case. In the underdamped case, MC shows that the current also exhibits the maximum in a large relaxation rate case, which results in enhancement of a mass separation capability as a function of the squared variation coefficient. The relation between our result and a resonant activation effect is discussed.

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