Lane formation in a system of dipolar microswimmers
Institute of Theoretical Physics, Secr. EW 7-1, Technical University Berlin - Hardenbergstrasse 36, D-10623 Berlin, Germany
Received: 10 February 2015
Accepted: 26 March 2015
Using Brownian dynamics (BD) simulations we investigate the non-equilibrium structure formation of a two-dimensional (2D) binary system of dipolar colloids propelling in opposite directions. Despite a pronounced tendency for chain formation, the system displays a transition towards a laned state reminiscent of lane formation in systems with isotropic repulsive interactions. However, the anisotropic dipolar interactions induce novel features: First, the lanes have themselves a complex internal structure characterized by chains or clusters. Second, laning occurs only in a window of interaction strengths. We interpret our findings by a phase separation process and simple force balance arguments.
PACS: 05.65.+b – Self-organized systems / 64.75.Xc – Phase separation and segregation in colloidal systems
© EPLA, 2015