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首页> 外文期刊>Physica, B. Condensed Matter >Asymmetric step-like characteristics in a tilted rocking ratchet potential
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Asymmetric step-like characteristics in a tilted rocking ratchet potential

机译：倾斜的棘轮电位中的不对称阶梯状特征

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The overdamped Langevin dynamics has been employed to study the directional transport of particles driven in a tilted rocking ratchet potential. The system subjected to a constant direct force undergoes an asymmetrical dynamic transition from a static state to a sliding state at two different critical forces that are consistent with the predicted values. When an additional alternating force is applied to the system, the time-averaged velocity shows several steps of equal height as the direct force increases. These steps are similar to the Shapiro steps in an rf-driven Josephson junction, and appear whenever the systems natural frequency given by the direct force matches an integer multiple of the applied frequency. When the alternating force exceeds a certain critical value which can be also estimated for a slow rocking, a directional motion known as the rectification effect occurs even at zero direct force.
机译：过度阻尼的兰格文动力学已被用于研究在倾斜的摇摆棘轮势中驱动的粒子的定向传输。受到恒定直接力的系统会在与预测值一致的两个不同临界力下经历从静态到滑动态的不对称动态过渡。当附加的交变力施加到系统时，随时间的平均速度会随着直接力的增加而显示出数个相等高度的台阶。这些步骤类似于射频驱动的约瑟夫森结中的Shapiro步骤，并且在由直接力给定的系统固有频率与所施加频率的整数倍匹配时出现。当交变力超过某个临界值（也可以针对慢速摇摆进行估算）时，即使在零直流力下也发生称为整流作用的定向运动。

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