Directed Current Induced by an Symmetrically ac Force Coexisting with a Time-Delayed Feedback |
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Authors: | YI Shu-Ting SONG Hui OU Zhi-E AI Bao-Quan XIONG Jian-Wen |
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Affiliation: | Laboratory of Quantum Information Technology, Institute for Condensed Matter Physics and School of Physics and Telecommunication Engineering,;South China Normal University, Guangzhou 510006, China |
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Abstract: | 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. |
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Keywords: | Brownian particle ratchet time delayed feedback |
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