Current in a two-dimensional ratchet with an asymmetric unbiased external force

Current in a two-dimensional ratchet with an asymmetric unbiased external force
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具有不对称无偏外力的二维棘轮中的电流

DOI:
10.1088/1751-8113/40/23/004
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发表时间:
2007-05
影响因子:
2.1
通讯作者:
Liu, Liang-gang
Liu, Liang-gang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Ai, Bao-quan;Li, Feng-guo;Liu, Liang-gang

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研究了在非对称无偏外力作用下过阻尼布朗粒子在非对称二维周期势中的输运。基于有效势法,将二维系统简化为一维系统。在准稳态极限下,得到了净电流的表达式。势之间的不对称参数、势的耦合参数和外力的时间不对称参数之间的竞争导致电流反转。当电流达到极值时,可能有三个最佳的温度值。
We study the transport of an overdamped Brownian particle moving in an asymmetric two-dimensional periodic potential in the presence of an asymmetric unbiased external force. Based on the effective potential approach, the two-dimensional system is simplified to the one-dimensional system. The expression of the net current is obtained at a quasi-steady-state limit. The competitions among the asymmetric parameter between the potentials, the coupling parameter of the potential and the temporally asymmetric parameter of the external force lead to current reversals. There may be three optimized values of temperature at which the current takes its extremum value.
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