耦合棘轮中的电流反转与同步
Current Reversals and Synchronization in Coupled Ratchets
摘要：
电流反转是一个有趣的现象，一直是最近的实验和理论研究的基础上的棘轮机制输运的中心。通过考虑两个相互作用的棘轮系统，我们演示了如何耦合可以用来控制逆转。特别是，我们发现，存在于一个单一的驱动棘轮系统中的电流反转，最终可以消除与第二棘轮的存在。对于特定的耦合强度的电流反转自由制度已被检测到。此外，在由耦合阈值$k_{th}$表征的完全同步状态中，找到特定的驱动幅度$a_{opt}$，对于该特定的驱动幅度，传输是最佳的。
英文摘要：
Current reversal is an intriguing phenomenon that has been central to recent experimental and theoretical investigations of transport based on ratchet mechanism. By considering a system of two interacting ratchets, we demonstrate how the coupling can be used to control the reversals. In particular, we find that current reversal that exists in a single driven ratchet system can ultimately be eliminated with the presence of a second ratchet. For specific coupling strengths a current-reversal free regime has been detected. Furthermore, in the fully synchronized state characterized by the coupling threshold $k_{th}$, a specific driving amplitude $a_{opt}$ is found for which the transport is optimum.
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