Regensburg 2016 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 39: Active Matter (Joint Session with DY)

BP 39.4: Vortrag

Mittwoch, 9. März 2016, 10:30–10:45, H46

Phase Behavior of Active Particles — •Jonathan Tammo Siebert¹, Janina Carmen Letz^{1, 2}, and Peter Virnau¹ — ¹Johannes Gutenberg University Mainz, Department of Physics, Staudingerweg 7, 55128 Mainz, Germany — ²University of Utah, Department of Mathematics, Salt Lake City, UT 84112-0090, USA

We have studied the phase behavior of active colloidal particles. Such systems undergo phase separation into a dense liquid-like and a dilute gas-like phase due to self trapping when a certain critical activity is exceeded both in experiment and simulation (Buttinoni et al., Phys. Rev. Lett., 110 (2013)). Starting point of our studies are the well known two dimensional active brownian particles. Further investigations were done on three dimensional as well as systems of active dimers. For all systems the phase diagrams were computed by extensive brownian dynamics simulations. Employing methods from equilibrium statistical physics we have aimed for an accurate estimate of the binodal line in a bulk system. Starting from a simple model system has allowed us to separate the influence of dimensionality and bonding of particles. In agreement with earlier studies we have found that active velocities needed for phase separation are much larger in the three dimensional system. Also active dimers only phase separate at higher activities than active disks.