Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: Active Matter I (joint session DY/CPP/BP)
CPP 9.3: Talk
Monday, March 12, 2018, 10:30–10:45, BH-N 243
Collective rotations of active particles interacting with obstacles — •Zahra Mokhtari1, Timo Aspelmeier2, and Annette Zippelius1 — 1Institut für Theoretische Physik, Georg-August-Universität Göttingen, Germany — 2Institut für Mathematische Stochastik, Georg-August-Universität Göttingen, Germany
We study the motion of active particles in the presence of static obstacles. We observe accumulation and crystallization of active particles around the obstacles which serve as nucleation sites, a phenomenon that is expected due to the known absorption of active particles at solid boundaries. In the limit of high activity, the crystals start to rotate spontaneously around the obstacle, resembling a rotating rigid body. We explain the occurrence of such rotations through the enhanced attraction of particles to the cluster whose orientation points along its rotational velocity as compared to those whose orientation points in the opposite direction.