Berlin 2005 – scientific programme

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DY: Dynamik und Statistische Physik

DY 52: Statistical Physics far from Thermal Equilibrium

DY 52.5: Talk

Wednesday, March 9, 2005, 13:30–13:45, TU H3010

Paradoxical directed diffusion due to temperature anisotropies — •Ralf Eichhorn and Peter Reimann — Universität Bielefeld, Fakultät für Physik, D-33615 Bielefeld

An analytically tractable, but still experimentally realistic model dynamics is investigated, describing the Brownian motion of a particle in a “meandering” periodic potential landscape under the simultaneous influence of two different heat baths. The main characteristics of the resulting far from equilibrium environment is an anisotropy of the ambient temperature. When an external static force F is applied, the particle moves in the direction opposite to that force (absolute negative mobility), and this even for arbitrarily large forces |F|. Moreover, even when the “meandering” potential exhibits a broken spatial symmetry, no preferential direction of motion arises for F=0.