论文标题
活跃粒子的集体运动，表现出非转录定向相互作用
Collective motion of active particles exhibiting non-reciprocal orientational interactions
论文作者
论文摘要
我们介绍了布朗动力学研究，该研究通过通常的空间相互作用，以及通过非重生回避定向相互作用，相互相互作用的2D浴场相互作用。我们激发了他们的激励，即藻类衣原体的两个鞭毛与附近的表面在空间上相互作用，使得扭矩在藻类上作用。正如预期的那样，在大多数情况下，这种相互作用破坏了活动浴中运动诱导的粒子聚类。然而，令人惊讶的是，如果非互联网相互作用的范围接近空间相互作用的范围，我们发现活性颗粒可以自组织为集体移动的羊群。我们观察到，蜂群运动可以通过多种结构形式表现出来，从单一密集带到多个中等密度的条纹，这些形式具有高度动态。发现羊群参数仅弱取决于基础羊群结构。加上局部密度分布的方差，可以清楚地将羊群运动分为两个单独的频带和动态缠绕状态。
We present a Brownian dynamics study of a 2d bath of active particles interacting among each other through usual steric interactions and, additionally, via non-reciprocal avoidant orientational interactions. We motivate them by the fact that the two flagella of the alga Chlamydomonas interact sterically with nearby surfaces such that a torque acts on the alga. As expected, in most cases such interactions disrupt the motility-induced particle clustering in active baths. Surprisingly, however, we find that the active particles can self-organize into collectively moving flocks if the range of non-reciprocal interactions is close to that of steric interactions. We observe that the flocking motion can manifest itself through a variety of structural forms, spanning from single dense bands to multiple moderately-dense stripes, which are highly dynamic. The flocking order parameter is found to be only weakly dependent on the underlying flock structure. Together with the variance of the local-density distribution, one can clearly group the flocking motion into the two separate band and dynamic-stripes states.
