Gardi Gaurav, Sitti Metin
Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany.
Department of Physics, University of Stuttgart, 70569 Stuttgart, Germany.
Phys Rev Lett. 2023 Aug 4;131(5):058301. doi: 10.1103/PhysRevLett.131.058301.
Coupled physical interactions induce emergent collective behaviors of many interacting objects. Nonreciprocity in the interactions generates unexpected behaviors. There is a lack of experimental model system that switches between the reciprocal and nonreciprocal regime on demand. Here, we study a system of magnetic microdisks that breaks action-reaction reciprocity via fluid-mediated hydrodynamic interactions, on demand. Via experiments and simulations, we demonstrate that nonreciprocal interactions generate self-propulsion-like behaviors of a pair of disks; group separation in collective of magnetically nonidentical disks; and decouples a part of the group from the rest. Our results could help in developing controllable microrobot collectives. Our approach highlights the effect of global stimuli in generating nonreciprocal interactions.
耦合的物理相互作用会引发许多相互作用物体的涌现集体行为。相互作用中的非互易性会产生意想不到的行为。目前缺乏一种能按需在互易和非互易状态之间切换的实验模型系统。在此，我们研究了一个磁性微盘系统，该系统可按需通过流体介导的流体动力相互作用打破作用 - 反作用的互易性。通过实验和模拟，我们证明非互易相互作用会产生一对圆盘的类似自推进的行为；在磁性不同的圆盘集合中产生群体分离；并使群体的一部分与其余部分解耦。我们的结果有助于开发可控的微型机器人集群。我们的方法突出了全局刺激在产生非互易相互作用中的作用。
