Emergence of self-organized multivortex states in flocks of active rollers
Emergence of self-organized multivortex states in flocks of active rollers
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DOI：
10.1073/pnas.2000061117
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发表时间：
2020-05-05
影响因子：
11.1
通讯作者：
Snezhko, Alexey
中科院分区：
文献类型：
--
作者：
Han, Koohee;Kokot, Gasper;Snezhko, Alexey
活性物质，无论是合成的还是生物的，都表现出复杂的时空自组织和集体行为的出现。涡旋相是一种连贯的旋转运动，因为它能够很好地组织自推进粒子在大距离上的运动，因此引起了人们的极大兴趣。然而，在没有几何限制的情况下，它的产生一直是一个挑战。在这里，我们通过实验和计算模拟表明，在无约束环境中，集中磁辊自组织成多涡旋态。我们发现，相邻的涡旋更有可能以相反的旋转感发生。我们的研究从微观尺度的旋转和单个活动元素的平移之间的耦合对宏观尺度上产生相干集体运动的机制提供了洞察力。这些结果可能会激发自组装动态材料和微型机器人的设计策略。
Active matter, both synthetic and biological, demonstrates complex spatiotemporal self-organization and the emergence of collective behavior. A coherent rotational motion, the vortex phase, is of great interest because of its ability to orchestrate well-organized motion of self-propelled particles over large distances. However, its generation without geometrical confinement has been a challenge. Here, we show by experiments and computational modeling that concentrated magnetic rollers self-organize into multivortex states in an unconfined environment. We find that the neighboring vortices more likely occur with the opposite sense of rotation. Our studies provide insights into the mechanism for the emergence of coherent collective motion on the macroscale from the coupling between microscale rotation and translation of individual active elements. These results may stimulate design strategies for self-assembled dynamic materials and microrobotics.