Motility versus fluctuations in mixtures of self-propelled and passive agents

Abstract

Many biological systems consist of self-motile and passive agents both of which contribute to overall functionality. However, there are very few studies of the properties of such mixtures. Here we formulate a model for mixtures of self-motile and passive agents and show that the model gives rise to three different dynamical phases: a disordered mesoturbulent phase, a polar flocking phase, and a vortical phase characterized by large-scale counterrotating vortices. We use numerical simulations to construct a phase diagram and compare the statistical properties of the different phases of the model with self-motile bacterial suspensions. Our findings afford specific insights regarding the interaction of microorganisms and passive particles and provide novel strategic guidance for efficient technological realizations of artificial active matter.

5 pages, 3 figures

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Cited by in corpus (2)

• Activity-induced phase separation and self-assembly in mixtures of active and passive particles
• Effect of Confinement and Topology: 2-TIPS vs MIPS