Journal
NEW JOURNAL OF PHYSICS
Volume 24, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac9cc3
Keywords
non-reciprocity; chiral active particles; motility-induced phase separation; flocking; hydrodynamic field equations
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [163436311-SFB 910]
- Open Access Publication Fund of TU Berlin
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This study investigates the impact of non-reciprocity on the collective behavior of a system of chiral active matter. The research suggests that non-reciprocity can change the stability and instability of the system and affect the relative orientation of flocks, highlighting the significance of non-reciprocity in understanding the emergent collective dynamics of chiral active matter systems.
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 on the emergent collective dynamics of chiral active matter systems, with potentially far-reaching biological implications.
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