Dresden 2017 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 41: Active Matter I (Joint Session DY/BP/CPP)

BP 41.7: Vortrag

Mittwoch, 22. März 2017, 16:45–17:00, HÜL 186

Determination of the phase behavior and the critical point in systems of active particles in depletants — •Jonathan Tammo Siebert1, Benjamin Trefz1,2, Thomas Speck1, Kurt Binder1, and Peter Virnau11Department of Physics, Johannes Gutenberg University of Mainz, D-55128 Mainz, Germany — 2Graduate School Materials Science in Mainz, D-55128 Mainz, Germany

We study a modified, active variant of the well-known Asakura-Oosawa model for colloid-polymer mixtures. Activity is introduced as Vicsek-like self-propulsion. This system already undergoes phase separation in case of zero propulsion. In the driven case, the binodal lines are shifted towards lower densities.

Building on earlier results for the binodal line, we completed the phase diagram by determination of the critical point, using a subsystem-block-density distribution analysis. In addition to understanding critical phenomena in this specific system far from equilibrium, the proposed method can serve as a recipe to find critical points and the associated exponents for other types of active particles.

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