Micro-flock patterns and macro-clusters in chiral active Brownian disks

Abstract

Chiral active particles (or self-propelled circle swimmers) feature a rich collective behavior, comprising rotating macro-clusters and micro-flock patterns which consist of phase-synchronized rotating clusters with a characteristic self-limited size. These patterns emerge from the competition of alignment interactions and rotations suggesting that they might occur generically in many chiral active matter systems. However, although excluded volume interactions occur naturally among typical circle swimmers, it is not yet clear if macro-clusters and micro-flock patterns survive their presence. The present work shows that both types of pattern do survive but feature strongly enhance fluctuations regarding the size and shape of the individual clusters. Despite these fluctuations, we find that the average micro-flock size still follows the same characteristic scaling law as in the absence of excluded volume interactions, i.e. micro-flock sizes scale linearly with the single-swimmer radius.

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• Chiral active hexatics: Giant number fluctuations, waves and destruction of order
• Hydrodynamic Synchronisation of Chiral Microswimmers
• Bodies in an Interacting Active Fluid: Far-Field Influence of a Single Body and Interaction Between Two Bodies
• Particle-scale statistical theory for hydrodynamically induced polar ordering in microswimmer suspensions
• Active particles in non-inertial frames: how to self-propel on a carousel
• Transport of the moving barrier driven by chiral active particles
• Microscopic field theory for structure formation in systems of self-propelled particles with generic torques
• Dynamical structures in phase-separating non-reciprocal polar active mixtures
• Resonant diffusion of a gravitactic circle swimmer
• Collective Hall current in chiral active fluids: Coupling of phase and mass transport through traveling bands
• Synchronization and exceptional points in nonreciprocal active polar mixtures
• Phase separation of self-propelled disks with ferromagnetic and nematic alignment