Directed transport driven by Lévy flights coexisting with subdiffusion

Details Directed transport driven by Lévy flights coexisting with subdiffusion Directed transport driven by Lévy flights coexisting with subdiffusion

2010-03-19

arxiv.org/abs/1003.3709v1

Journal of Chemical physics 132(2010)094504

Physics

Condensed Matter

Statistical Mechanics

6 figures

Scientific paper

10.1063/1.3327842

Transport of the Brownian particles driven by L\'evy flights coexisting with subdiffusion in asymmetric periodic potentials is investigated in the absence of any external driving forces. Using the Langevin-type dynamics with subordination techniques, we obtain the group velocity which can measure the transport. It is found that the group velocity increases monotonically with the subdiffusive index and there exists an optimal value of the L\'evy index at which the group velocity takes its maximal value. There is a threshold value of the subdiffusive index below which the ratchet effects will disappear. The nonthermal character of the L\'evy flights and the asymmetry of the potential are necessary to obtain the directed transport. Some peculiar phenomena induced by the competition between L\'evy flights and subdiffusion are also observed. The pseudonormal diffusion will appear on the level of the median.

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