Dresden 2020 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 14: Microswimmers (joint session DY/CPP)

DY 14.4: Vortrag

Montag, 16. März 2020, 16:00–16:15, ZEU 160

Percolation transition of pusher-type microswimmers — •Fabian Jan Schwarzendahl1,2 and Marco G. Mazza2,31Department of Physics, University of California, Merced,5200 N. Lake Road, Merced, California 95343, USA — 2Max Planck Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077 Göttingen, Germany — 3Interdisciplinary Centre for Mathematical Modelling and Department of Mathematical Sciences,Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom

In this talk I will present the presence of a continuum percolation transition in model suspensions of pusher-type microswimmers. The clusters dynamically aggregate and disaggregate resulting from a competition of attractive and repulsive hydrodynamic and steric interactions. As the microswimmers' filling fraction increases, the cluster size distribution approaches a scale-free form and there emerge large clusters spanning the entire system. We characterize this microswimmer percolation transition via the critical exponents, analytical arguments, and scaling relations known from percolation theory. This finding opens new vistas on microswimmers' congregative processes.

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