Regensburg 2004 – scientific programme

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DY: Dynamik und Statistische Physik

DY 12: Dynamical Phenomena

DY 12.2: Talk

Monday, March 8, 2004, 11:45–12:00, H2

Paradoxical non-linear response of a Brownian particle — •Ralf Eichhorn and Peter Reimann — Universität Bielefeld, Fakultät für Physik, D-33615 Bielefeld

We consider a single, classical Brownian particle in a periodic potential landscape far from thermal equilibrium, that shows the following remarkable response behavior to an external static force: Though the system is far from equilibrium, its linear response is exactly the same as in the equilibrium case; in particular, the particle motion follows the direction of the external static force. However, upon increasing the static force to the non-linear response regime, the particle suddenly starts to move in the direction opposite to the static bias. These astonishing properties of our system are investigated analytically and numerically.