Behavior-dependent critical dynamics in collective states of active particles
Author(s)
Löffler, Robert C; Bäuerle, Tobias; Kardar, Mehran; Rohwer, Christian M; Bechinger, Clemens
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<jats:title>Abstract</jats:title>
<jats:p>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, <jats:italic>i.e.</jats:italic>, 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.</jats:p>
Date issued
2021Department
Massachusetts Institute of Technology. Department of PhysicsJournal
EPL (Europhysics Letters)
Publisher
IOP Publishing
Citation
Löffler, Robert C, Bäuerle, Tobias, Kardar, Mehran, Rohwer, Christian M and Bechinger, Clemens. 2021. "Behavior-dependent critical dynamics in collective states of active particles." EPL (Europhysics Letters), 134 (6).
Version: Final published version