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DY: Fachverband Dynamik und Statistische Physik

DY 43: Active Matter IV (joint session DY/BP/CPP)

DY 43.2: Vortrag

Donnerstag, 21. März 2024, 10:00–10:15, BH-N 334

Metastability of ordered phase in discretized flocking — •Swarnajit Chatterjee¹, Mintu Karmakar², Matthieu Mangeat¹, Raja Paul², and Heiko Rieger¹ — ¹Center for Biophysics & Department for Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany. — ²School of Mathematical & Computational Sciences, IACS, Kolkata – 700032, India.

Polar flocks are observed in a large class of active matter systems and have been considered robust to fluctuations. However, recent studies have argued that liquid polar flocks are metastable to the presence of small obstacles [1] or to the nucleation of opposite-phase droplets [2]. In this work, we study the stability of the ordered phase in flocking models with q-fold symmetry under the influence of counter- or transversely-propagating droplets. We observe that the liquid phase is more susceptible to a transversely-propagating droplet than a counter-propagating droplet. Also, for droplet counter-propagation, system morphology is dominated by a novel “sandwich state” of the liquid state and the droplet state rather than a reversal of the liquid phase. Here spatial anisotropy plays a crucial role. Metastability of the liquid phase in a discretized Vicsek model shows a strong dependency on the noise strength where the anisotropy parameter q does not significantly affect the reversal dynamics. Our study further investigates the influence of droplet size, density, and other control parameters on liquid stability.

[1] Codina et al., PRL 128, 218001 (2022).

[2] Benvegnen et al., arXiv:2306.01156 (2023).

Keywords: Active Matter; Flocking; Metastability