Efficiency optimization in a correlation ratchet with asymmetric unbiased fluctuations.
Efficiency optimization in a correlation ratchet with asymmetric unbiased fluctuations.
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DOI：
10.1103/physreve.68.061105
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发表时间：
2003-07
期刊：
影响因子：
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通讯作者：
B. Ai;Xian-ju Wang;Guo-tao Liu;Dehua Wen;Hui-zhang Xie;Wei Chen;Liang-gang Liu
中科院分区：
文献类型：
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作者：
B. Ai;Xian-ju Wang;Guo-tao Liu;Dehua Wen;Hui-zhang Xie;Wei Chen;Liang-gang Liu
研究了存在非对称无偏涨落时，布朗粒子在周期势场中运动的效率。我们发现，即使在准静态极限上，也存在效率可以是温度的峰值函数的区域，这证明了热涨落促进了能量转换的效率，这与早期的发现相矛盾[H.Kamegawa等人，Phys.莱特牧师。80,5251(1998)]。研究还发现，在有限温度下，时间非对称性和空间非对称性之间的相互作用可能导致效率的最优化。当棘轮提供最大电流时，它的效率不是最高。
The efficiency of a Brownian particle moving in a periodic potential in the presence of asymmetric unbiased fluctuations is investigated. We found that even on the quasistatic limit there is a regime where the efficiency can be a peaked function of temperature, which proves that thermal fluctuations facilitate the efficiency of energy transformation, contradicting the earlier findings [H. Kamegawa et al., Phys. Rev. Lett. 80, 5251 (1998)]. It is also found that the mutual interplay between temporal asymmetry and spatial asymmetry may induce optimized efficiency at finite temperatures. The ratchet is not most efficient when it gives maximum current.