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Tight-binding approach to overdamped Brownian motion on a multidimensional tilted periodic potential
Phys. Rev. E 87, 052102 – Published 6 May, 2013
DOI: https://doi.org/10.1103/PhysRevE.87.052102
Abstract
We present a theoretical treatment of overdamped Brownian motion on a multidimensional tilted periodic potential that is analogous to the tight-binding model of quantum mechanics. In our approach, we expand the continuous Smoluchowski equation in the localized Wannier states of the periodic potential to derive a discrete master equation. This master equation can be interpreted in terms of hopping within and between Bloch bands, and for weak tilting and long times we show that a single-band description is valid. In the limit of deep potential wells, we derive a simple functional dependence of the hopping rates and the lowest band eigenvalues on the tilt. We also derive formal expressions for the drift and diffusion in terms of the lowest band eigenvalues.
Article Text
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