Volume 124, Number 3, November 2018
|Number of page(s)||7|
|Published online||05 December 2018|
Velocity alignment promotes motility-induced phase separation
1 CECAM Centre Européen de Calcul Atomique et Moléculaire, École Polytechnique Fédérale de Lausanne, Batochimie - Avenue Forel 2, 1015 Lausanne, Switzerland
2 Departament de Física de la Matèria Condensada, Universitat de Barcelona - Martí i Franqués 1, E-08028 Barcelona, Spain
3 UBICS University of Barcelona Institute of Complex Systems - Martí i Franquès 1, E-08028 Barcelona, Spain
Received: 10 July 2018
Accepted: 2 November 2018
We study the phase behavior of polar active Brownian particles moving in two-spatial dimensions and interacting through volume exclusion and velocity alignment. We combine particle-based simulations of the microscopic model with a simple mean-field kinetic model to understand the impact of velocity alignment on the motility-induced phase separation of self-propelled disks. We show that, as the alignment strength is increased, approaching the onset of collective motion from below, orientational correlations grow, rendering the diffusive reorientation dynamics slower. As a consequence, the tendency of particles to aggregate into isotropic clusters is enhanced, favoring the complete de-mixing of the system into a low and high-density phase.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 64.75.Xc – Phase separation and segregation in colloidal systems / 87.10.Mn – Stochastic modeling
© EPLA, 2018
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