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DY: Fachverband Dynamik und Statistische Physik
DY 15: Active Matter II (joint session BP/CPP/DY)
DY 15.13: Vortrag
Dienstag, 19. März 2024, 12:45–13:00, H 1028
Self-Organization in Quorum-Sensing Active Matter: The Interplay between Nonreciprocity and Motility — •Yu Duan1, Jaime Agudo-Canalejo1, Ramin Golestanian1,2, and Benoît Mahault1 — 1Max Planck Institute for Dynamics and Self-Organization (MPI-DS), 37077 Göttingen, Germany — 2Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
Over the past years, the generation of interactions breaking action-reaction symmetry has emerged as new paradigm for active matter. The generalization of the Cahn-Hilliard theory of phase separation to nonreciprocal mixtures predicts the emergence of traveling states that break time reversal symmetry when intra-species attraction leads to demixing while chasing inter-species interactions are present. Here, we study a minimal model of active phase separation involving two species of particles regulating their self-propulsion speed via quorum-sensing rules, and identify a mechanism for dynamical pattern formation that does not rely on the standard route of intra-species effective attractive interactions. Instead, our results reveal a highly dynamical phase of chasing bands induced only by the combined effects of self-propulsion and nonreciprocity in the inter-species couplings. Turning on self-attraction, we find that the system may phase separate into a macroscopic domain of such chaotic chasing bands coexisting with a dilute gas. We show that the chaotic dynamics of bands at the interfaces of this phase-separated phase results in anomalously slow coarsening.
Keywords: active matter; nonreciprocity; quorum sensing; phase separation; pattern formation