Current in a three-dimensional periodic tube with unbiased forces.
Current in a three-dimensional periodic tube with unbiased forces.
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DOI：
10.1103/physreve.74.051114
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发表时间：
2006-11
期刊：
影响因子：
--
通讯作者：
B. Ai;Liang-gang Liu
中科院分区：
文献类型：
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作者：
B. Ai;Liang-gang Liu
研究了在存在不对称无偏力的情况下沿三维不对称周期管的轴移动的布朗粒子的输运。坐标的减少不仅涉及熵势垒的出现，还涉及有效扩散系数。研究发现，在存在熵势垒的情况下，管形状的不对称性和无偏力的不对称性是感应净电流的两种方式。电流是温度的峰值函数，这表明即使存在熵势垒，热噪声也可以促进传输。优化半径存在于电流达到最大值的瓶颈处。两个相反的驱动因素之间的竞争可能会导致电流逆转。
Transport of a Brownian particle moving along the axis of a three-dimensional asymmetric periodic tube is investigated in the presence of asymmetric unbiased forces. The reduction of the coordinates may involve not only the appearance of entropic barrier but also the effective diffusion coefficient. It is found that in the presence of entropic barrier, the asymmetry of the tube shape and the asymmetry of the unbiased forces are the two ways of inducing a net current. The current is a peaked function of temperature which indicates that the thermal noise may facilitate the transport even in the presence of entropic barrier. An optimized radius exists at the bottleneck at which the current takes its maximum value. Competition between the two opposite driving factors may induce current reversal.