Weak disorder strongly improves the selective enhancement of diffusion in a tilted periodic potential

Weak disorder strongly improves the selective enhancement of diffusion in a tilted periodic potential

The diffusion of an overdamped Brownian particle in a tilted periodic potential is known to exhibit a pronounced enhancement over the free thermal diffusion within a small interval of tilt values. Here we show that weak disorder in the form of small, time-independent deviations from a strictly spati...

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Veröffentlicht in:Physical review letters 2008-10, Vol.101 (18), p.180601-180601, Article 180601
Hauptverfasser: Reimann, Peter, Eichhorn, Ralf
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container_title Physical review letters
container_volume 101
creator Reimann, Peter
Eichhorn, Ralf
description The diffusion of an overdamped Brownian particle in a tilted periodic potential is known to exhibit a pronounced enhancement over the free thermal diffusion within a small interval of tilt values. Here we show that weak disorder in the form of small, time-independent deviations from a strictly spatially periodic potential may further boost this diffusion peak by orders of magnitude. Our general theoretical predictions are in excellent agreement with experimental observations.
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title Weak disorder strongly improves the selective enhancement of diffusion in a tilted periodic potential
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