Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 65: Granular Matter / Contact Dynamics (joint session DY/CPP)

CPP 65.2: Talk

Thursday, March 15, 2018, 10:15–10:30, BH-N 333

Rotator crystals in a granular monolayer — •Simeon Völkel and Kai Huang — Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany

The collective behaviour of vertically vibrated hexagonal disks confined in a horizontal monolayer is investigated experimentally. The disks tend to rotate upon sufficiently strong driving. Additionally, they can arrange in a hexagonal structure, reminiscent of a rotator crystal in equilibrium systems. We investigate the transitions into and out of this non-equilibrium steady state and their dependence on the presence of a wetting liquid. Furthermore we characterize the rotator crystal state using the bond orientational order parameter, parameters coupled with set voronoi diagrams, as well as the distribution of particle orientations. Finally we explore the influence of the disk's shape by varying the number of corners systematically.