门控棘轮中的非正弦电流和电流反转
Non-sinusoidal current and current reversals in a gating ratchet
摘要：
本文研究了布朗粒子在正弦外力作用下的棘轮动力学。当另一个谐波被用来调制粒子运动的空间对称势时，观察到门控棘轮效应。对于小振幅的谐波，它示出的电流（平均速度）的颗粒表现出一个正弦形状作为一个精确的组合的两个谐波的相位的函数。通过增加谐波的幅度超过小限制制度，偏离正弦曲线的行为，也可以诱导电流反转。即使对于粒子的过阻尼动力学，这些电流反转也持续存在。
英文摘要：
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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