Berlin 2015 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 16: Microswimmers - Part I (joint session DY/ BP/ CPP)

DY 16.11: Talk

Tuesday, March 17, 2015, 12:15–12:30, BH-N 128

Complex lane formation in asystem of dipolar mircroswimmers — •Florian Kogler and Sabine H. L. Klapp — Institute of Theoretical Physics, Secr. EW 7-1, Technical University Berlin, Hardenbergstrasse 36, D-10623 Berlin, Germany

We investigate the non-equilibrium structure formation of an experimentally motivated [1] two-dimensional (2D) binary system of dipolar colloids propelling in opposite directions. Using Brownian Dynamics simulations we find a transition towards a laned state, reminiscent of the laning transition in colloidal systems with isotropic repulsive inter actions. However, the strongly anisotropic dipolar interactions induce two novel features: First, lanes are characterized by a complex internal structure. Second, the laning transition displays reentrance with respect to the interaction strength. We interprete our findings by simple theoretical arguments relating the observed behaviour to general equilibrium properties of phase-separating fluids [2].

[1] S. Gangwal and O. J. Cayre and M. Z. Bazant and O. D. Velev, PRL 100 (2008) 058302.

[2] F. Kogler and S. H. L. Klapp, preprint