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Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 17: Poster I

DY 17.18: Poster

Dienstag, 26. Februar 2008, 16:00–18:00, Poster C

Absolute negative mobility of an inertial Brownian particle — •David Speer1, Joachim Nagel2, Tobias Gaber2, Ralf Eichhorn1, Peter Reimann1, Reinhold Kleiner2, and Dieter Koelle21Universität Bielefeld, Fakultät für Physik, 33615 Bielefeld, Germany — 2Universität Tübingen, Physikalisches Institut - Experimentalpysik II, 72076 Tübingen, Germany

We consider a single inertial Brownian particle in a symmetric periodic potential. Recently [1,2], it was shown that such a system is likely to exhibit absolute negative mobility (ANM), once thermal equilibrium is broken by a time-periodic force. E.g. the particle climbs uphill against a static tilt of the potential. The effect is due to noisy chaos in the model. We give an intuitive explanation, explain related effects, explore the the parameter region associated with ANM and consider generalizations of the model. Recent experiments [3] with Josephson Junctions show very good agreement with our predictions.

[1] L. Machura et al., Phys. Rev. Lett. 98, 040601 (2007).

[2] D. Speer et al., Europhys. Lett. 79, 10005 (2007), D. Speer et al., Phys. Rev. E 76, 051110 (2007).

[3] J. Nagel et al., in preparation.

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