Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-11-02
J. Phys. A: Math. Theor. 40, 14715 (2007)
Physics
Condensed Matter
Statistical Mechanics
10 pages, 2 figures, iopart.cls included
Scientific paper
10.1088/1751-8113/40/49/007
Based on the system heat bath approach where the bath is nonlinearly modulated by an external Gaussian random force, we propose a new microscopic model to study directed motion in the overdamped limit for a nonequilibrium open system. Making use of the coupling between the heat bath and the external modulation as a small perturbation we construct a Langevin equation with multiplicative noise and space dependent dissipation and the corresponding Fokker-Planck-Smoluchowski equation in the overdamped limit. We examine the thermodynamic consistency condition and explore the possibility of observing a phase induced current as a consequence of state dependent diffusion and, necessarily, nonlinear driving of the heat bath by the external noise.
Banik Suman Kumar
Barik Debashis
Chaudhuri Jyotipratim Ray
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