Behavior-dependent critical dynamics in collective states of active particles
Behavior-dependent critical dynamics in collective states of active particles
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DOI：
10.1209/0295-5075/ac0c68
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发表时间：
2021-06-01
期刊：
影响因子：
1.8
通讯作者：
Bechinger, Clemens
中科院分区：
文献类型：
--
作者：
Loeffler, Robert C.;Baeuerle, Tobias;Bechinger, Clemens
我们通过实验证明了活性胶体粒子（APs）系统中的临界集体行为，通过使用反馈控制的相互作用的变化来实现。在群和旋流之间的过渡中，我们观察到旋转序参量的显式分岔动力学和临界慢化，即弛豫时间增长了近一个数量级。临界动力学的附加特征，包括对称性破坏粒子相互作用时的滞后，以及磁化率的最大值，都是根据纯粹基于序参数的时间反转对称性的理论模型来测量和表征的。作者根据知识共享署名4.0国际许可（CC by）的条款，由EPLA出版。
We experimentally demonstrate critical collective behavior in a system of active colloidal particles (APs), achieved through variations of their mutual interactions using feedback control. At the transition between a swarm and a swirl we observe an explicit bifurcation dynamics of the rotational order parameter and a critical slowing down, i.e., a growth of the relaxation time by almost one order of magnitude. Additional signatures of critical dynamics, including hysteresis in presence of symmetry-breaking particle interactions, and a maximum of the susceptibility, are measured and characterized in terms of a theoretical model which is based purely on the time-reversal symmetry of the order parameter. Copyright (C) 2021 The author(s) Published by the EPLA under the terms of the Creative Commons Attribution 4.0 International License (CC BY).