Clustering and flocking of repulsive chiral active particles with non-reciprocal couplings

Abstract

Recently, non-reciprocal systems have become a focus of growing interest. Examples occur in soft and active matter, but also in engineered quantum materials and neural (brain) networks. Here, we investigate the impact of non-reciprocity on the collective behavior of a system of (dry) chiral active matter. Specifically, we consider a mixture of "circle swimmers" with steric interactions and non-reciprocal alignment couplings. Based on hydrodynamic equations which we derive from a set of Langevin equations, we explore the interplay of non-reciprocity, finite size, and chirality. We first consider, as a reference, one-species systems with reciprocal couplings. Based on a linear stability analysis and numerical simulations, we here observe three different types of collective behavior, that is, flocking, motility-induced phase separation, and a combination of both. Turning then to a non-reciprocal system, we find that non-reciprocity can turn otherwise stationary instabilities into oscillatory ones, affect the relative orientation of flocks, and, crucially, change the general type of instability. This illustrates the drastic impact of non-reciprocity and chirality on the emergent collective dynamics of active matter systems, with potentially far-reaching biological implications.

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Cited by in corpus (28)

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• Dynamical phase transitions in the nonreciprocal Ising model
• Field-Theory of Active Chiral Hard Disks: A First-Principles Approach to Steric Interactions
• Nonreciprocity induces resonances in two-field Cahn-Hilliard model
• Robustness of travelling states in generic non-reciprocal mixtures
• Swirling due to misaligned perception-dependent motility
• Dynamical structures in phase-separating non-reciprocal polar active mixtures
• Condensation and Synchronization in Aligning Chiral Active Matter
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• Synchronization and exceptional points in nonreciprocal active polar mixtures
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• Simple mathematical model for a pairing-induced motion of active and passive particles
• Thermodynamic nature of irreversibility in active matter
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• Spiral folding of a flexible chain of chiral active particles
• Collective dynamics and elasto-chemical cluster waves in communicating colloids with explicit size response
• A Dean-Kawasaki equation for reaction diffusion systems driven by Poisson noise
• Stochastic Thermodynamics of Non-reciprocally Interacting Particles and Fields
• Entropy production in non-reciprocal polar active mixtures
• A minimal model with stochastically broken reciprocity
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• Kinetic Theory of Chiral Active Disks: Odd Transport and Torque Density