Emergent Collective Phenomena in a Mixture of Hard Shapes through Active Rotation

Condensed Matter journal club

Emergent Collective Phenomena in a Mixture of Hard Shapes through Active Rotation

  • Event time: 11:30am
  • Event date: 16th May 2014
  • Speaker: Joakim Stenhammar (Formerly School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details

Abstract

We investigate collective phenomena with rotationally driven spinners of concave shape. Each spinner experiences a constant internal torque in either a clockwise or counterclockwise direction. Although the spinners are modeled as hard, otherwise noninteracting rigid bodies, their active motion induces an effective interaction that favors rotation in the same direction. With increasing density and activity, phase separation occurs via spinodal decomposition, as well as self-organization into rotating crystals. We observe the emergence of cooperative, superdiffusive motion along interfaces, which can transport inactive test particles. Our results demonstrate novel phase behavior of actively rotated particles that is not possible with linear propulsion or in nondriven, equilibrium systems of identical hard particles.
PRL 112 article 075701 (2014)
pdf version

Authors

Nguyen H. P. Nguyen, Daphne Klotsa, Michael Engel, Sharon C. Glotzer