二维波纹通道中自推进颗粒的整流与扩散
Rectification and diffusion of self-propelled particles in a two-dimensional corrugated channel
摘要：
数值研究了二维波纹通道中自推进粒子的整流扩散过程。通过数值模拟，得到了各层的平均速度和有效扩散系数。研究发现，自推进颗粒可以通过自推进速度进行整流。存在最佳值的参数（自推进速度，平移扩散常数，和电位的高度），在平均速度采取其最大值。存在一个最佳平移扩散，在该扩散处有效扩散常数最大。自推进速度会强烈地增加有效扩散，而大的旋转扩散速率会强烈地抑制有效扩散。
英文摘要：
Rectification and diffusion of non-interacting self-propelled particles is numerically investigated in a two-dimensional corrugated channel. From numerical simulations, we obtain the average velocity and the effective diffusion coefficient. It is found that the self-propelled particles can be rectified by the self-propelled velocity. There exist optimal values of the parameters (the self-propelled velocity, the translational diffusion constant, and the height of the potential) at which the average velocity takes its maximal value. There exists an optimal translational diffusion at which the effective diffusion constant is maximal. The self-propelled velocity can strongly increase the effective diffusion, while the large rotational diffusion rate can strongly suppress the effective diffusion.
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