SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 26: Focus Session: From Inter-individual Variability to Heterogeneous Group Dynamics and Disorder in Active Matter (joint session DY/BP/CPP)

DY 26.8: Vortrag

Mittwoch, 29. März 2023, 12:15–12:30, ZEU 160

Active Brownian Particles in a disordered motility environment — Gianni Jacucci¹, •Davide Breoni², Sandrine Heijnen³, Hartmut Löwen², Giorgio Volpe³, and Sylvain Gigan¹ — ¹Laboratoire Kastler-Brossel, Paris, France — ²HHU Universität, Düsseldorf, Germany — ³University College London, London, United Kingdom

The study of active matter, i.e. matter that consumes energy to perform actions, is fundamental to deepen the knowledge of living systems, as for example bacterial colonies or flocks of birds, and their collective behaviors. Complex environments, like the internal structure of a cell or a blood vessel, are of particular relevance in this field, as they provide a better description of the real-life settings typical of living matter.

In this work we study the effects of a disordered motility field on active Brownian particles, both in experiments and simulations. Experimentally, the motility field is generated by applying a speckle light field to thermophoretic Janus particles, in our case silica colloids half-coated with a carbon layer, suspended in a critical mixture of water and 2,6-lutidine. We focus on the differences between the effects of respectively a homogeneous and a disordered motility field on the dynamics of the particles.