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arXiv 0710.0883cond-mat.stat-mech
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利维航班存在时波动驱动的定向运输

Fluctuation-driven directed transport in the presence of Levy flights

D. del-Castillo-Negrete, V. Yu. Gonchar, A. V. Chechkin

摘要:

数值证据的对称Levy噪声驱动的定向输运在时间无关的棘轮势在没有一个外部倾斜力。数值求解了周期势场中的分数阶Fokker-Planck方程和相应的带Levy噪声的Langevin方程。Levy噪声驱动系统脱离热力学平衡,并产生上坡净电流。对于较小的噪声强度值,存在产生最大电流的Levy噪声指数的最佳值。电流的方向和大小可以通过改变Levy噪声不对称性和电势不对称性来控制。

英文摘要:

Numerical evidence of directed transport driven by symmetric Levy noise in time-independent ratchet potentials in the absence of an external tilting force is presented. The results are based on the numerical solution of the fractional Fokker-Planck equation in a periodic potential and the corresponding Langevin equation with Levy noise. The Levy noise drives the system out of thermodynamic equilibrium and an up-hill net current is generated. For small values of the noise intensity there is an optimal value of the Levy noise index yielding the maximum current. The direction and magnitude of the current can be manipulated by changing the Levy noise asymmetry and the potential asymmetry.

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