BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 12: Posters DY - Fluid Physics, Active Matter, Complex Fluids, Soft Matter and Glasses (joint session DY/BP)
DY 12.12: Poster
Montag, 22. März 2021, 14:00–16:30, DYp
Unjamming of Active Rotators — •Linda Ravazzano1, Silvia Bonfanti1, Maria C. Lionetti1, Maria R. Fumagalli1, Roberto Guerra1, Oleksandr Chepizhko2, Caterina A. M. La Porta1, and Stefano Zapperi1 — 1Center for Complexity and Biosystems, University of Milan, Italy — 2Leopold-Franzens-Universität Innsbruck, Austria
Active particles assemblies are of peculiar interest thanks to the richness of dynamical phases they can undergo varying internal parameters such as density, adhesion strength or self-propulsion. Most theoretical studies of active matter consider self-propelled particles driven by active forces. The observation of the motion of Chlamydomonas reinhardtii algae, in which the active particles have also the ability to self-rotate, suggests, however, that active torques may also play an important role. Inspired by this example, we simulate the dynamics of a system of interacting active 2D disks endowed with active torques and self-propulsive forces. We studied this model system of active rotators in different conditions: at low packing fractions, where adhesion causes the formation of small rotating clusters, at higher densities, where our simulations show a jamming to unjamming transition promoted by active torques and hindered by adhesion, and in presence of both self-propulsion and self-rotation, studying the interplay between those quantities and deriving a phase diagram. Our results yield a comprehensive picture of the dynamics of active rotators, highlighting the importance of the internal degrees of freedom of active particles in determining the collective behavior of the system.