Inhomogeneous friction leading to current in periodic system

被引：7

作者：

Bao, JD ^{[1
]}

Abe, Y

Zhuo, YZ

机构：

[1] Beijing Meteorol Coll, Beijing 100081, Peoples R China

[2] China Ctr Adv Sci & Technol, World Lab, Beijing 100080, Peoples R China

[3] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 606, Japan

[4] Inst Atom Energy, Beijing 102413, Peoples R China

来源：

PHYSICA A | 1999年 / 265卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

directed motion; inertia ratchet; space-dependent friction; Langevin simulation;

D O I：

10.1016/S0378-4371(98)00480-4

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the diffusion process of a Brownian particle moving in a one-dimensional ratchet with space-dependent friction that is subjected to an external source. The equation of motion for a particle involves a multiplicative fluctuation, a nonlinear friction and an external driving force or a Gaussian white noise. The average position of the particle is simulated numerically in terms of the Langevin Monte Carlo method and discussed by means of the adiabatic approximation and the effective potential. The influence of coordinate-dependent friction on the average position and the direction of current of the particle is investigated. The results show that a net drift can be produced in the presence of both a coordinate-dependent friction and an external fluctuation, even when the ratchet potential and the temporal force are completely symmetrical. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：111 / 118

页数：8

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