Nonsinusoidal current and current reversals in a gating ratchet

被引：9
|
作者：
Dinis, Luis [1 ,2 ]
Quintero, Niurka R. [3 ,4 ]
机构：
[1] Univ Complutense Madrid, Dept Fis Atom Mol & Nucl, E-28040 Madrid, Spain
[2] Grp Interdisciplinar Sistemas Complejos, Madrid, Spain
[3] Univ Seville, Inst Matemat, Seville, Spain
[4] Univ Seville, EPS, Dept Fis Aplicada 1, Seville 41011, Spain
来源：
PHYSICAL REVIEW E | 2015年 / 91卷 / 03期
关键词：
BROWNIAN MOTORS; TRANSPORT; MOTION;
D O I：
10.1103/PhysRevE.91.032920
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
In this work, the ratchet dynamics of Brownian particles driven by an external sinusoidal (harmonic) force is investigated. The gating ratchet effect is observed when another harmonic is used to modulate the spatially symmetric potential in which the particles move. For small amplitudes of the harmonics, it is shown that the current (average velocity) of particles exhibits a sinusoidal shape as a function of a precise combination of the phases of both harmonics. By increasing the amplitudes of the harmonics beyond the small-limit regime, departures from the sinusoidal behavior are observed and current reversals can also be induced. These current reversals persist even for the overdamped dynamics of the particles.
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页数：6
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