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DY: Fachverband Dynamik und Statistische Physik
DY 17: Active Matter II (joint session DY/BP/CPP)
DY 17.7: Vortrag
Montag, 9. März 2026, 16:30–16:45, ZEU/0160
Flocking transitions in dense mixtures of active self-aligning and passive particles — •Weizhen Tang1, Amir Shee2, Zhangang Han1, Pawel Romanczuk3,4, Yating Zheng3,4, and Cristián Huepe1, 5, 6 — 1School of Systems Science, Beijing Normal University, Beijing, China — 2Department of Physics, University of Vermont, USA — 3Department of Biology, Humboldt Universität zu Berlin, Unter den Linden 6, Berlin, Germany — 4Research Cluster of Excellence ’Science of Intelligence’, Berlin, Germany — 5Northwestern Institute on Complex Systems and ESAM, Northwestern University, Evanston, USA — 6CHuepe Labs, 2713 West Augusta Blvd #1, Chicago, USA
We investigate the passivity-driven flocking transition in a dense mixture of self-aligning active particles and passive particles, using a minimal model of active polar disks. We show that anisotropic damping leads to a discontinuous flocking transition as a function of the fraction of passive components, whereas isotropic damping produces a smooth transition where the final ordered state can display sustained oscillations and remain trapped in a metastable state, depending on the exact spatial arrangement of the passive particles. We also explore in detail the emergence of metastable oscillatory ordered states and their relation to the spatial distribution of passive particles and interstitial voids. Our findings demonstrate that heterogeneous activity and mobility anisotropy can result in a rich variety of self-organized states in various biological systems, synthetic active materials, and robotic swarms.
Keywords: Heterogeneous active systems; flocking transition; collective motion; active matter