Ratchet motion and current reversal of coupled Brownian motors in pulsating symmetric potentials

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• 作者：Chen-Pu Li ; Hong-Bin Chen ; Zhi-Gang Zheng
• 关键词：coupled Brownian motors ; ratchet ; effective potential ; symmetric periodic potential ; noise
• 刊名：Frontiers of Physics
• 出版年：2017
• 出版时间：August 2017
• 年：2017
• 卷：12
• 期：4
• 全文大小：846 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-0470
• 卷排序：12

文摘

In this study, we investigate the collective directed transport of coupled Brownian particles in spatially symmetric periodic potentials under time-periodic pulsating modulations. We find that the coupling between two particles can induce symmetry breaking and consequently collective directed motion. Moreover, the direction of motion can be reversed under certain conditions. The dependence of directed current on various parameters is systematically studied. reverse motion can be achieved by modulating the coupling free length and the phase shift of the pulsating potential. The dynamical mechanism of these transport properties is understood in terms of the effective-potential theory and the space-time transformation invariance. The directed transport of coupled Brownian motors can be manipulated and optimized by adjusting the coupling strength, pulsating frequency, or noise intensity.