Brownian pump in nonlinear diffusive media

Details Brownian pump in nonlinear diffusive media Brownian pump in nonlinear diffusive media

2010-03-19

arxiv.org/abs/1003.3728v2

Journal of Physical Chemistry B 112(2008)9540-9545

Physics

Condensed Matter

Statistical Mechanics

15 pages, 9 figures

Scientific paper

A Brownian pump in nonlinear diffusive media is investigated in the presence of an unbiased external force. The pumping system is embedded in a finite region and bounded by two particle reservoirs. In the adiabatic limit, we obtain the analytical expressions of the current and the pumping capacity as a function of temperature for normal diffusion, subdiffusion and superdiffusion. It is found that important anomalies are detected in comparison to the normal diffusion case. The superdiffusive regime, compared with the normal one, exhibits an opposite current for low temperatures. In subdiffusive regime, the current may become forbidden for low temperatures and negative for high temperatures.

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