Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Active Matter A (joint session DY/CPP)

CPP 6.1: Hauptvortrag

Montag, 1. April 2019, 09:30–10:00, H20

Collective behavior and self-organisation of active granular particles — •Thorsten Pöschel, Michael Engel, Christian Scholz, and Harol Torres — Friedrich-Alexander-Universität Erlangen-Nürnberg

Biological organisms and artificial active particles self-organize into swarms and patterns. Open questions concern the design of emergent phenomena by choosing appropriate forms of activity and particle interactions. A particularly simple and versatile system are 3D-printed robots on a vibrating table that can perform self-propelled and self-spinning motion. Here we study a mixture of minimalistic clockwise and counter-clockwise rotating robots, called rotors. Our experiments show that rotors move collectively and exhibit super-diffusive interfacial motion and phase separate via spinodal decomposition. On long time scales, confinement favors symmetric demixing patterns. By mapping rotor motion on a Langevin equation with a constant driving torque and by comparison with computer simulations, we demonstrate that our macroscopic system is a form of active soft matter.

C. Scholz, T. Pöschel, Phys. Rev. Lett. 118, 198003 (2017)

C. Scholz, M. Engel, T. Pöschel, Nature Comm. 9, 931 (2018)

C. Scholz, S. D'Silva, T. Pöschel, New J. Phys. 18, 123001 (2016)

C. Scholz, T. Pöschel, Revista Cubana de Física 34, 69 (2017)