论文标题
活动拓扑缺陷阻碍活性椭圆形液体中的动态停滞
Motile topological defects hinder dynamical arrest in dense liquids of active ellipsoids
论文作者
论文摘要
最近的数值研究已将主动运动的持久性时间确定为密集的活性物质中玻璃动力学的关键参数。在这里，我们研究了具有可调持续性和速度的颗粒活性椭圆形液体的动力学。我们表明，增加中等过冷时的持久性时间等同于增加平衡液体中吸引力的强度，并导致重新进入动力学不仅在自由度的转化程度下，而且在方向方向上也是如此。然而，在高密度，运动拓扑缺陷，特有的伸长颗粒的活性液体，阻碍了动态停滞。最值得注意的是，对于最高的活动，我们观察到由于这些缺陷的障碍而导致的间歇性动力学。
Recent numerical studies have identified the persistence time of active motion as a critical parameter governing glassy dynamics in dense active matter. Here we studied dynamics in liquids of granular active ellipsoids with tunable persistence and velocity. We show that increasing the persistence time at moderate supercooling is equivalent to increasing the strength of attraction in equilibrium liquids and results in reentrant dynamics not just in the translational degrees of freedom, as anticipated, but also in the orientational ones. However, at high densities, motile topological defects, unique to active liquids of elongated particles, hindered dynamical arrest. Most remarkably, for the highest activity, we observed intermittent dynamics due to the jamming-unjamming of these defects for the first time.
