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DY: Fachverband Dynamik und Statistische Physik

DY 53: Posters - Active Matter

DY 53.8: Poster

Thursday, March 23, 2017, 17:00–19:30, P1A

Phase behaviour of active Brownian particles — •Andreas Fischer and Thomas Speck — Institut für Physik, Johannes-Gutenberg-Universität Mainz, Germany

At sufficiently high densities and propulsion speeds, solutions of self-propelled colloidal particles can undergo a phase separation into large clusters and a dilute gas phase even without attractive interactions [1]. The same qualitative behaviour has been observed in simulations of ’active Brownian particles’ - a minimal model capturing the main physical ingredients volume exclusion and persistence of motion. This motility induced phase separation is caused by a dynamical instability due to self-trapping of the particles and can be mapped onto that of passive fluids with attractive interactions via an effective free energy [2]. We extend this model to more general interactions and explore the phase behaviour combining analytic theory and numerical simulations.

I. Buttinoni, J. Bialké, F. Kümmel, H. Löwen, C. Bechinger, and T. Speck, Phys. Rev. Lett. 110, 238301 (2013)
T. Speck, A.M. Menzel, J. Bialké, and H. Löwen, J. Chem. Phys. 142, 224109 (2015)