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Behavior-dependent critical dynamics in collective states of active particles

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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/ac0c68

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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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ISO 690LÖFFLER, 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/ac0c68
BibTex
@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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