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DY: Fachverband Dynamik und Statistische Physik
DY 32: Poster: Active Matter, Soft Matter, Fluids
DY 32.13: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster C
Flocking of two unfriendly species — •Matthieu Mangeat1, Swarnajit Chatterjee1, Chul-Ung Woo2, Jae Dong Noh2, and Heiko Rieger1 — 1Saarland University, Saarbrücken, Germany — 2University of Seoul, Seoul, Korea
Complex systems are typically heterogeneous as individuals vary in their properties, their response to the external environment and to each other. In particular, many biological systems that show flocking involve self-propelled particles with heterogeneous interactions, which motivates the study of populations with multiple species. In this work, we consider the two-species variant of the Vicsek model (TSVM) and the active Ising model (TSAIM), consisting of two kinds of self-propelled particles that tend to align with particles from the same species and to antialign with the other. These two-species models show a flocking transition that is reminiscent of the original one-species model, as a liquid-gas phase transition, and display phase-separation in the coexistence region where dense liquid bands of each species propagate in a gaseous background. The interesting feature of these models is the appearance of two dynamical states in the coexistence region: the PF (parallel flocking) state in which all bands of the two species propagate in the same direction, and the APF (antiparallel flocking) state in which the bands of two different species move in opposite directions. PF and APF states perform stochastic transitions from one to the other only in TSVM, and the APF liquid phase of the TSVM is replaced by a high density PF state in the TSAIM. We also study the impact of particle switching from one species to another.
Keywords: flocking; multispecies flocking; Vicsek model; active Ising model