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DY: Fachverband Dynamik und Statistische Physik

DY 59: Microswimmers II (joint session DY/CPP/BP)

DY 59.4: Vortrag

Donnerstag, 15. März 2018, 10:45–11:00, BH-N 243

Cluster formation of microswimmers with individually controlled motility — •Tobias Bäuerle¹, Andreas Fischer², Thomas Speck², and Clemens Bechinger¹ — ¹Universität Konstanz, Germany — ²Johannes Gutenberg Universität Mainz, Germany

One of the most interesting aspects of microswimmers is their ability to form dynamical clusters even in the absence of long-ranged interactions. Previous experiments and simulations have demonstrated the occurrence of phase separation into large clusters and a dilute gas phase when the density and motility of the particles is sufficiently high. In contrast to previous studies, where the particle motility was kept constant in space and time, in our experiments we are able to control the motility of each single microswimmer depending on its surrounding, e.g. the local density and configuration of microswimmers. Using a light-activated system, such individual motility control is achieved by a feed-back system consisting of a rapidly scanned laser beam and a real-time particle detection algorithm. By introducing appropriate interaction-rules we demonstrate that formation of clusters can occur already at very small particle densities and that their shape and density can be modified by small variations in the interaction rules.