Uphill anomalous transport in a deterministic system with speed-dependent friction coefficient |
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| Affiliation: | 1. Department of Physics, Kunming University, Kunming 650214, China;2. Department of Physics, Yunnan University, Kunming 650091, China |
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| Abstract: | We investigate the transport of a deterministic Brownian particle theoretically, which moves in simple onedimensional, symmetric periodic potentials under the influence of both a time periodic and a static biasing force. The physical system employed contains a friction coefficient that is speed-dependent. Within the tailored parameter regime, the absolute negative mobility, in which a particle can travel in the direction opposite to a constant applied force, is observed.This behavior is robust and can be maximized at two regimes upon variation of the characteristic factor of friction coefficient. Further analysis reveals that this uphill motion is subdiffusion in terms of localization(diffusion coefficient with the form D(t) ~t~(-1) at long times). We also have observed the non-trivially anomalous subdiffusion which is significantly deviated from the localization; whereas most of the downhill motion evolves chaotically, with the normal diffusion. |
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| Keywords: | speed-dependent friction coefficient anomalous transport anomalous diffusion |
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