Analytical approach to chiral active systems: Suppressed phase separation of interacting Brownian circle swimmers

We consider chirality in active systems by exemplarily studying the phase behavior of planar systems of interacting Brownian circle swimmers with a spherical shape. For this purpose, we derive a predictive field theory that is able to describe the collective dynamics of circle swimmers. The theory y...

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Bibliographic Details
Published in:The Journal of chemical physics 2022-05, Vol.156 (19), p.194904-194904
Main Authors: Bickmann, Jens, Bröker, Stephan, Jeggle, Julian, Wittkowski, Raphael
Format: Article
Language:English
Subjects:
Brownian motion
Chirality
Circles (geometry)
Critical point
Field theory
Mathematical analysis
Motility
Phase separation
Simulation
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Summary:We consider chirality in active systems by exemplarily studying the phase behavior of planar systems of interacting Brownian circle swimmers with a spherical shape. For this purpose, we derive a predictive field theory that is able to describe the collective dynamics of circle swimmers. The theory yields a mapping between circle swimmers and noncircling active Brownian particles and predicts that the angular propulsion of the particles leads to a suppression of their motility-induced phase separation, being in line with recent simulation results. In addition, the theory provides analytical expressions for the spinodal corresponding to the onset of motility-induced phase separation and the associated critical point as well as for their dependence on the angular propulsion of the circle swimmers. We confirm our findings by Brownian dynamics simulations. Agreement between results from theory and simulations is found to be good.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0085122