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arXiv 1709.04372cond-mat.soft
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活性物质体系中的负微分迁移率与俘获

Negative Differential Mobility and Trapping in Active Matter Systems

C. Reichhardt, C. J. O. Reichhardt

摘要:

使用模拟,我们研究的平均速度作为一个功能的活性物质粒子移动通过一个随机的障碍物阵列施加的漂移力。我们发现,对于低漂移力,有一个初始的流动制度,其中的流动性随驱动器线性增加,而对于较高的漂移力的制度出现的负微分流动性,其中的速度随着驱动器的增加,由于捕获的活性颗粒后面的障碍物而降低。当所有的颗粒被永久地捕获在障碍物后面时,在非常高的漂移力下存在完全堵塞的状态。我们发现,增加活动的整体流动性是非单调的,与增强的流动性小的活动水平和减少流动性大的活动水平。我们展示了这些影响如何演变为磁盘和障碍物密度,有效运行长度,漂移力,和电机力的函数。

英文摘要:

Using simulations, we examine the average velocity as a function of applied drift force for active matter particles moving through a random obstacle array. We find that for low drift force, there is an initial flow regime where the mobility increases linearly with drive, while for higher drift forces a regime of negative differential mobility appears in which the velocity decreases with increasing drive due to the trapping of active particles behind obstacles. A fully clogged regime exists at very high drift forces when all the particles are permanently trapped behind obstacles. We find for increasing activity that the overall mobility is nonmonotonic, with an enhancement of the mobility for small levels of activity and a decrease in mobility for large activity levels. We show how these effects evolve as a function of disk and obstacle density, active run length, drift force, and motor force.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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