Spontaneous segregation of self-propelled particles with different motilities

Condensed Matter journal club

Spontaneous segregation of self-propelled particles with different motilities

  • Event time: 11:30am
  • Event date: 13th April 2012
  • Speaker: Mike Cates (Formerly School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details

Abstract

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.
Soft Matter 8 Pages 2527-2534 (2012)
pdf version of paper

Authors

Samuel R. McCandlish, Aparna Baskaran and Michael F. Hagan