Spontaneous segregation of self-propelled particles with different motilities

By Sam McCandlish, A. Baskaran, M. Hagan. 2011

178 citations recorded by the source corpus.

We study mixtures of self-propelled and passive rod-like particles in two dimensions using Brownian dynamics simulations. The simulations demonstrate that the two species spontaneously segregate to generate a rich array of dynamical domain structures whose properties depend on the propulsion velocity, density, and composition. In addition to presenting phase diagrams as a function of the system parameters, we investigate the mechanisms driving segregation. We show that the difference in collision frequencies between self-propelled and passive rods provides a driving force for segregation, which is amplified by the tendency of the self-propelled rods to swarm or cluster. Finally, both self-propelled and passive rods exhibit giant number fluctuations for sufficient propulsion velocities.

Subfields: Condensed Matter Physics, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/b5dabefb0732b76dd351cd7462ed35a25cc88d14

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Citations in the corpus

Tuned, driven, and active soft matter (2015, background): “Laning states were identified [453, 489, 491, 492] that feature parallel stripes or lanes within which all particles propel into the same direction.”
Hydrodynamics of soft active matter (2013, unknown): “Phys., Vol. 85, No. 3, July–September 2013 (McCandlish, Baskaran, and Hagan, 2012).”
Nonequilibrium physics in biology (2019, background): “Similar segregation phenomena have been observed in mixtures of active and passive swimmers (McCandlish et al., 2012) and might also be relevant for the segregation of transcribed and not transcribed DNA in the cell nucleus (Grosberg and Joanny, 2015). c. Length regulation involving molecular…”
Physics of microswimmers—single particle motion and collective behavior: a review (2014, background): “…cluster formation, as well as to various kinds of ordered phases in Brownian Dynamics simulations (Abkenar et al., 2013; Kraikivski et al., 2006; McCandlish et al., 2012; Peruani et al., 2006; Wensink et al., 2012; Wensink and Löwen, 2008; Yang et al., 2010), as well as in theoretical…”
Active Particles in Complex and Crowded Environments (2016, background): “…Angelani et al. (2011a), Kaiser et al. (2012), Kaiser et al. (2013), Yang et al. (2012), Wittkowski and Löwen (2012), Wensink and Löwen (2012), McCandlish et al. (2012), Bialké et al. (2012), Redner et al. (2013b), Reichhardt and Olson-Reichhardt (2013a), Elgeti and Gompper (2013),…”