Directed transport of an asymmetric particle pair induced by non-equilibrium 
conditions

Porto, M.

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Directed transport of an asymmetric particle pair induced by non-equilibrium conditions

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Porto, M.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Porto, M. (2002). Directed transport of an asymmetric particle pair induced by non-equilibrium conditions. European Physical Journal B, 25(3), 345-350. Retrieved from http://link.springer.de/link/service/journals/10051/bibs/2025003/20250345.htm.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-382E-1

Abstract

The hopping motion of a classical bounded pair of two particles along a chain is investigated. It is shown that in the asymmetric case of the system dynamics including excited states which differ from the respective ground states by the barrier to be overcome by one of the two particles, the over- and underpopulation of these excited states leads to a directed motion of the particle pair. Thereby, overpopulation results in one direction of motion, whereas underpopulation results in the opposite direction, and the mean velocity is determined by the amount of over-resp. underpopulation. For small deviations from equilibrium, the system exhibits linear response well known from other ratchet-type models. Possible generalizations and applications are discussed.