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DY: Fachverband Dynamik und Statistische Physik
DY 32: Poster: Active Matter, Soft Matter, Fluids
DY 32.7: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster C
Consequence of anisotropy on flocking: the truly discretized Vicsek model — •Mintu Karmakar1, Swarnajit Chatterjee2, Raja Paul1, and Heiko Rieger2,3 — 1School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Kolkata – 700032, India. — 2Center for Biophysics & Department for Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany. — 3INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany.
We numerically study a “true” discretization of the Vicsek model (TDVM) on an off-lattice two-dimensional domain to probe the transition of collective motion as the system switches its symmetry from discrete to continuous. The TDVM consists of particles able to execute motion on a plane in q discrete angular directions like the active clock model (ACM) and follows dynamical rules of particle alignment and movement inspired by the prototypical Vicsek model (VM). We find a novel cluster phase for small q and noise and observe the formation of microphase and cross-sea in the phase coexistence region as q is increased and the system approaches the VM. We find that although the giant number fluctuations for large q corroborate with the nature of phase separation in the coexistence region, the large length-scale behavior of the direction of the global order and correlations does not correspond with it. We also investigate the stability of the ordered liquid phase and find it metastable to the nucleation of droplets of different polarization.
Keywords: Active matter; Collective motion; Phase separation; Vicsek dynamics; flocking