Publikation: Behavior-dependent critical dynamics in collective states of active particles
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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.
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LÖFFLER, Robert C., Tobias BÄUERLE, Mehran KARDAR, Christian M. ROHWER, Clemens BECHINGER, 2021. Behavior-dependent critical dynamics in collective states of active particles. In: EPL (Europhysics Letters). Institute of Physics Publishing (IOP). 2021, 134(6), 64001. ISSN 0295-5075. eISSN 1286-4854. Available under: doi: 10.1209/0295-5075/ac0c68BibTex
@article{Loffler2021Behav-55208, year={2021}, doi={10.1209/0295-5075/ac0c68}, title={Behavior-dependent critical dynamics in collective states of active particles}, number={6}, volume={134}, issn={0295-5075}, journal={EPL (Europhysics Letters)}, author={Löffler, Robert C. and Bäuerle, Tobias and Kardar, Mehran and Rohwer, Christian M. and Bechinger, Clemens}, note={Article Number: 64001} }
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