Reversibility, Pattern Formation and Edge Transport in Active Chiral and Passive Disk Mixtures

Abstract

We numerically examine mixtures of circularly moving and passive disks as a function of density and active orbit radius. For low or intermediate densities and/or small orbit radii, the system can organize into a reversible partially phase separated labyrinth state in which there are no collisions between disks, with the degree of phase separation increasing as the orbit radius increases. As a function of orbit radius, we find a divergence in the number of cycles required to reach a collision-free steady state at a critical radius, while above this radius the system remains in a fluctuating liquid state. For high densities, the system can organize into a fully phase separated state that is mostly reversible, but collisions at the boundaries between the phases lead to a net transport of disks along the boundary edges in a direction determined by the chirality of the active disk orbits. We map the dynamic phases as a function of density and orbit radii, and discuss the results in terms of the reversible-irreversible transition found in other periodically driven non-thermal systems. We also consider mixtures of circularly driven disks and ac driven disks where the ac drive is either in or out of phase with the circular motion, and find a rich variety of pattern forming and reentrant disordered phases.

14 pages, 20 figures

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• Simultaneous Phase Separation and Pattern Formation in Chiral Active Mixtures
• Active Microrheology, Hall Effect, and Jamming in Chiral Fluids
• Analytical approach to chiral active systems: suppressed phase separation of interacting Brownian circle swimmers
• Perspective on Reversible to Irreversible Transitions in Periodic Driven Many Body Systems and Future Directions For Classical and Quantum Systems
• Chiral active matter in external potentials
• Dynamics of Magnus Dominated Particle Clusters, Collisions, Pinning and Ratchets
• Field-Theory of Active Chiral Hard Disks: A First-Principles Approach to Steric Interactions
• Shapiro Steps and Nonlinear Skyrmion Hall Angles For dc and ac Driven Skyrmions on a Two Dimensional Periodic Substrate
• Shear Banding, Intermittency, Jamming and Dynamic Phases for Skyrmions in Inhomogeneous Pinning Arrays
• Rectification in a mixture of active and passive particles subject to a ratchet potential
• Future Directions for Active Matter on Ordered Substrates
• Chiral Edge Currents for ac Driven Skyrmions in Confined Pinning Geometries
• From Flocking to Condensation: Collective Dynamics in Binary Chiral Active Matter
• Chiral Active Matter