Directed Current Induced by an Symmetrically ac Force Coexisting with a Time-Delayed Feedback
Directed Current Induced by an Symmetrically ac Force Coexisting with a Time-Delayed Feedback
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DOI：
10.1088/0253-6102/57/2/11
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发表时间：
2012-02
影响因子：
3.1
通讯作者：
S. Yi;Hui Song;Zhi-e Ou;B. Ai;J. Xiong
中科院分区：
文献类型：
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作者：
S. Yi;Hui Song;Zhi-e Ou;B. Ai;J. Xiong
研究了在非对称交流驱动力和时滞反馈作用下，过阻尼布朗粒子在对称周期势场中的输运问题。研究发现，在低频时，改变驱动振幅可以使平均速度为负值，在高频时，存在一个最佳驱动振幅，在该振幅处平均速度最大。此外，存在驱动振幅的阈值，低于该阈值，对于高频不能获得定向传输。对于大的延迟时间，平均速度与延迟时间无关。
We study the transport of overdamped Brownian particles in a symmetrically periodic potential in the presence of an asymmetrically ac driving force and a time-delayed feedback. It is found that for low frequencies, the average velocity can be negative by changing the driving amplitude, for high frequencies, there exists an optimized driving amplitude at which the average velocity takes its maximum value. Additionally, there is a threshold value of driving amplitude below which no directed transport can be obtained for high frequencies. For the large value of the delay time, the average velocity is independent of the delay time.