Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2005-04-16
Physics
Condensed Matter
Statistical Mechanics
19 pages, 2 figures, to appear in Physics Letters A. Revised form
Scientific paper
The problem of Brownian motion in a periodic potential, under the influence of external forcing, which is either random or periodic in time, is studied in this paper. Multiscale techniques are used to derive general formulae for the steady state particle current and the effective diffusion tensor. These formulae are then applied to calculate the effective diffusion coefficient for a Brownian particle in a periodic potential driven simultaneously by additive Gaussian white and colored noise. Our theoretical findings are supported by numerical simulations.
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