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arXiv 1709.06121cond-mat.softcond-mat.stat-mech
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非均匀介质中活性物质的雪崩动力学

Avalanche Dynamics for Active Matter in Heterogeneous Media

C. J. O. Reichhardt, C. Reichhardt

备注：
11 pages, 7 figures
发表信息：
New J. Phys. 20, 025002 (2018)
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摘要：

利用数值模拟，我们研究了活性物质运行和翻滚磁盘在无序排列的障碍物移动的动力学。作为一个功能的增加活动磁盘密度和活动，我们发现一个过渡从一个完全堵塞的状态到一个连续的流动阶段，并在大的活动限制，我们观察到一个间歇性的状态，在那里的运动发生在雪崩的幂律分布的大小与指数$β= 1.46$。相反，在热或低活动极限，我们发现的运动爆发的大小分布不广泛。我们认为，在高度活跃的制度，该系统达到了自干扰状态，由于活动引起的自聚簇，和间歇性的动力学是类似的发现在生产的非晶态固体。我们的研究结果表明，活动是另一种途径，通过它颗粒系统可以调整到一个非平衡临界状态。

英文摘要：

Using numerical simulations, we examine the dynamics of active matter run-and-tumble disks moving in a disordered array of obstacles. As a function of increasing active disk density and activity, we find a transition from a completely clogged state to a continuous flowing phase, and in the large activity limit, we observe an intermittent state where the motion occurs in avalanches that are power law distributed in size with an exponent of $β= 1.46$. In contrast, in the thermal or low activity limit we find bursts of motion that are not broadly distributed in size. We argue that in the highly active regime, the system reaches a self-jamming state due to the activity-induced self-clustering, and that the intermittent dynamics is similar to that found in the yielding of amorphous solids. Our results show that activity is another route by which particulate systems can be tuned to a nonequilibrium critical state.

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