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DY: Fachverband Dynamik und Statistische Physik
DY 34: Focus Session: Fluids with Broken Time-Reversal Symmetry – Odd/Hall Viscosity Between Active Matter and Electron Flows
DY 34.2: Vortrag
Mittwoch, 11. März 2026, 10:00–10:15, ZEU/0160
From Gels to Rotors: Tunable Chiral Phases in Odd Colloidal Fluids — •Dennis Schorn1, Stijn van der Ham2, Suvendu Mandal1, Benno Liebchen1, and Hanumantha Rao Vutukuri2 — 1Institute for Condensed Matter Physics, Technische 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 reveal a phase in which the passive particles form a gel-like network, with significant holes filled with self-organized, rotating chiral clusters composed of spinners. This phase can be reversed by changing the system’s composition and magnetic field strength, resulting in a spanning spinner phase with embedded counter-rotating chiral clusters made of passive colloids. Both phases exhibit odd viscosity and diffusivity, whose magnitudes depend sensitively on spinner fraction and magnetic field strength. 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