Regensburg 2025 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 2: Active Matter I (joint session DY/BP/CPP)
BP 2.1: Vortrag
Montag, 17. März 2025, 09:30–09:45, H37
Odd dynamics and pattern formation in mixtures of magnetic spinners and passive colloids — •Dennis Schorn1, Stijn van der Ham2, Hanumantha Rao Vutukuri2, and Benno Liebchen1 — 1Technische Universität Darmstadt, 64289 Darmstadt, Germany — 2MESA+ Institute, University of Twente, 7500 AE Enschede, The Netherlands
Starfish embryos aggregate into chiral crystals exhibiting odd elasticity (Tan et al. Nature 607, 287 (2022)). Similar structures have been recently observed in externally driven magnetic colloids. In this talk, I present experiments and simulations of binary mixtures of magnetic spinners and passive colloids. We develop a model to predict the phase diagram of the system, which comprises four distinct phases that can be systematically reproduced in experiments. In particular, our simulations and experiments show a phase where the passive particles form a gel-like network featuring significant holes filled with self-organized rotating chiral clusters made of spinners. This phase can be reversed by changing the system’s composition and magnetic field strength, featuring a system spanning spinner phase with embedded counter-rotating chiral clusters made of passive colloids. Our system may open the route towards a new type of viscoelastic active chiral matter involving nonreciprocal interactions between both species.
Keywords: Chiral Active Matter; Odd Dynamics; Soft Matter