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Phenomenon of Repeated Current Reversals in the Brownian Ratchet
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| YANG Ming1,3;CAO Li1,2,3;WU Da-Jin1,2,3;LI Xiang-Lian1 |
| 1Department of Physics, Huazhong University of Science and Technology, Wuhan 430074
2CCAST (World Laboratory), PO Box 8730, Beijing 100080
3State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074 |
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| Cite this article: |
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YANG Ming, CAO Li, WU Da-Jin et al 2002 Chin. Phys. Lett. 19 1759-1762 |
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Abstract We study the probability current of the Brownian particles in a tilted periodic piecewise linear “saw-tooth” potential. It is found that the stationary probability current would take on a maximum value at a given additive noise if the intensity of the multiplicative noise is appropriate and at the same time both of the two noises are correlated; and the direction of the stationary probability current is reversed more than once upon some certain correlation intensities between both noises. It is proven that the occurrence of current reversal is only dependent on the relative intensity of the multiplicative and additive noises, but has nothing to do with the absolute intensities of the two noises.
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05.40.+j
66.30.Dn
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Published: 01 December 2002
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