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Transportation of Two Coupled Particles in an Asymmetric Saw-Tooth Potential |
| Ling-Wei Kong1,2, Rong-Zheng Wan1**, Hai-Ping Fang1 |
1Division of Interfacial Water, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800
2University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Ling-Wei Kong, Rong-Zheng Wan, Hai-Ping Fang 2016 Chin. Phys. Lett. 33 020501 |
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Abstract Based on a simple model, we theoretically show the transport behaviors of two harmonically coupled Brownian particles in an asymmetric saw-tooth potential with two slopes. The coupled particles are subject to stochastic fluctuations. It is found that when the equilibrium distance of the coupled particles is between the two slopes of the potential, the transport direction of the coupled particles will be reversed with a certain harmonic coupling strength. This current reversal can be easily understood with the near rigid approximation, where the two coupled particles can be regarded as a single particle in an effective potential. Compared with the original saw-tooth potential, the asymmetry of the effective potential could be reversed when the equilibrium distance is between the two slopes of the original potential, which results in the current reversal.
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Received: 19 November 2015
Published: 26 February 2016
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| PACS: |
05.10.Gg
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(Stochastic analysis methods)
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05.40.-a
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(Fluctuation phenomena, random processes, noise, and Brownian motion)
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05.60.Cd
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(Classical transport)
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