Emergent vortices and phase separation in systems of chiral active particles with dipolar interactions

Abstract

Using Brownian dynamics (BD) simulations we investigate the self-organization of a monolayer of chiral active particles with dipolar interactions. Each particle is driven by both, translational and rotational self-propulsion, and carries a permanent point dipole moment at its center. The direction of the translational propulsion for each particle is chosen to be parallel to its dipole moment. Simulations are performed at high dipolar coupling strength and a density below that related to motility-induced phase separation in simple active Brownian particles. Despite this restriction, we observe a wealth of phenomena including formation of two types of vortices, phase separation, and flocking transitions. To understand the appearance and disappearance of vortices in the many-particle system, we further investigate the dynamics of simple ring structures under the impact of self-propulsion.

14 pages and 12 figures

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• Geometry-Induced Dynamics of Confined Chiral Active Matter
• Long-range translational order and hyperuniformity in two-dimensional chiral active crystal
• Chiral active systems near a substrate: Emergent damping length controlled by fluid friction
• Singular density correlations in chiral active fluids in three dimensions
• Thermodynamic nature of irreversibility in active matter
• Circular motion subject to external alignment under active driving: nonlinear dynamics and the circle map
• Chiral Active Matter