Flocking by Turning Away,Physical Review X

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Flocking by Turning Away
Physical Review X ( IF 11.6 ) Pub Date : 2024-07-12 , DOI: 10.1103/physrevx.14.031008
Suchismita Das ₁ , Matteo Ciarchi ₁ , Ziqi Zhou ₂ , Jing Yan _{3,

3} , Jie Zhang _{2,

2} , Ricard Alert _{1,

4,

5,

6}

Affiliation

Flocking, as paradigmatically exemplified by birds, is the coherent collective motion of active agents. As originally conceived, flocking emerges through alignment interactions between the agents. Here, we report that flocking can also emerge through interactions that turn agents away from each other. Combining simulations, kinetic theory, and experiments, we demonstrate this mechanism of flocking in self-propelled Janus colloids with stronger repulsion on the front than on the rear. The polar state is stable because particles achieve a compromise between turning away from left and right neighbors. Unlike for alignment interactions, the emergence of polar order from turn-away interactions requires particle repulsion. At high concentration, repulsion produces flocking Wigner crystals. Whereas repulsion often leads to motility-induced phase separation of active particles, here it combines with turn-away torques to produce flocking. Therefore, our findings bridge the classes of aligning and nonaligning active matter. Our results could help to reconcile the observations that cells can flock despite turning away from each other via contact inhibition of locomotion. Overall, our work shows that flocking is a very robust phenomenon that arises even when the orientational interactions would seem to prevent it.

中文翻译：

转身而聚集

集群，以鸟类为例，是活性剂的连贯集体运动。正如最初设想的那样，集群是通过代理之间的排列相互作用而出现的。在这里，我们报告说，聚集也可以通过使代理人彼此疏远的互动而出现。结合模拟、动力学理论和实验，我们证明了这种自驱动 Janus 胶体的聚集机制，前部的排斥力强于后部。极性态是稳定的，因为粒子在远离左邻居和右邻居之间实现了折衷。与排列相互作用不同，转向相互作用产生的极序需要粒子排斥。在高浓度下，斥力会产生聚集的维格纳晶体。虽然斥力通常会导致运动引起的活性颗粒的相分离，但在这里它与转向扭矩相结合以产生植绒。因此，我们的研究结果弥合了排列和非排列活性物质的类别。我们的结果可能有助于协调这样的观察结果：尽管通过运动的接触抑制而彼此远离，但细胞仍可以聚集。总的来说，我们的工作表明，聚集是一种非常强大的现象，即使方向相互作用似乎阻止了这种现象，这种现象也会出现。

更新日期：2024-07-12

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