Weak disorder strongly improves the selective enhancement of diffusion in a tilted periodic potential |
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Authors: | Reimann Peter Eichhorn Ralf |
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Affiliation: | Universit?t Bielefeld, Fakult?t für Physik, 33615 Bielefeld, Germany. |
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Abstract: | 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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