6533b823fe1ef96bd127eba1
RESEARCH PRODUCT
From scalar to polar active matter: Connecting simulations with mean-field theory
Ashreya JayaramAndreas FischerThomas Specksubject
PhysicsStatistical Mechanics (cond-mat.stat-mech)Cluster stateFOS: Physical sciencesCondensed Matter - Soft Condensed MatterPolarization (waves)01 natural sciencesRod010305 fluids & plasmasActive matterClassical mechanicsMean field theoryPhase (matter)0103 physical sciencesPolarSoft Condensed Matter (cond-mat.soft)010306 general physicsBrownian motionCondensed Matter - Statistical Mechanicsdescription
We study numerically the phase behavior of self-propelled elliptical particles interacting through the ``hard'' repulsive Gay-Berne potential at infinite P\'eclet number. Changing a single parameter, the aspect ratio, allows us to continuously go from discoid active Brownian particles to elongated polar rods. Discoids show phase separation, which changes to a cluster state of polar domains, which then form polar bands as the aspect ratio is increased. From the simulations, we identify and extract the two effective parameters entering the mean-field description: the force imbalance coefficient and the effective coupling to the local polarization. These two coefficients are sufficient to obtain a complete and consistent picture, unifying the paradigms of scalar and polar active matter.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-10-13 |