Volume 48, Number 5, December 1999
|Page(s)||491 - 497|
|Published online||01 September 2002|
Threshold diffusion in a tilted washboard potential
Istituto Nazionale di Fisica della Materia, Università di Camerino, I-62032 Camerino (Macerata), Italy
Accepted: 30 September 1999
We characterize the locked-to-running transition of a Brownian particle in a tilted washboard potential by looking at its transport properties in the vicinity of the transition threshold. At low temperatures the (normal) spatial diffusion of the particle is enhanced as a consequence of the unlocking mechanism; in the overdamped regime an analytic expression is obtained that relates the particle diffusion constant to its mobility; in the underdamped regime an unusually large diffusion constant is revealed through numerical simulation. The latter regime is analyzed in terms of multiple jump statistics.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 02.50.Ey – Stochastic processes / 05.60.-k – Transport processes
© EDP Sciences, 1999
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