Absolute negative mobility induced by thermal equilibrium fluctuations

Details Absolute negative mobility induced by thermal equilibrium fluctuations Absolute negative mobility induced by thermal equilibrium fluctuations

2006-09-19

arxiv.org/abs/cond-mat/0609452v2

Phys. Rev. Lett. 98, 040601 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures. Phys. Rev. Lett. (in press)

Scientific paper

10.1103/PhysRevLett.98.040601

A novel transport phenomenon is identified that is induced by inertial Brownian particles which move in simple one-dimensional, symmetric periodic potentials under the influence of both a time periodic and a constant, biasing driving force. Within tailored parameter regimes, thermal equilibrium fluctuations induce the phenomenon of absolute negative mobility (ANM), which means that the particle noisily moves {\it backwards} against a small constant bias. When no thermal fluctuations act, the transport vanishes identically in these tailored regimes. There also exist parameter regimes, where ANM can occur in absence of fluctuations on grounds which are rooted solely in the complex, inertial deterministic dynamics. The experimental verification of this new transport scheme is elucidated for the archetype symmetric physical system: a convenient setup consisting of a resistively and capacitively shunted Josephson junction device.

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