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DY: Fachverband Dynamik und Statistische Physik

DY 7: Stochastic processes, brownian motion, and transport

DY 7.1: Topical Talk

Dienstag, 23. März 2010, 09:30–10:00, H46

Directing Brownian motion: Negative mobility and beyond — •Ralf Eichhorn — Nordic Institute for Theoretical Physics (Nordita), Stockholm, Sweden

The movement of a Brownian particle in a symmetric, periodic potential landscape under the influence of external driving forces is considered, and the response to a small static perturbation is studied. We show that quite unusual transport properties may arise. Specifically, average particle motion opposite to the static force (negative mobility) is observed. An intuitive explanation of the underlying physical mechanism, experimental realizations, and generalizations of this effect are presented.