Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Active Matter III (joint session DY/BP/CPP)

CPP 27.5: Vortrag

Mittwoch, 20. März 2024, 10:45–11:00, BH-N 334

Collective dynamics and pair-distribution function of active Brownian ellipsoids* — Stephan Bröker¹, •Michael te Vrugt², and Raphael Wittkowski¹ — ¹Institut für Theoretische Physik, Center for Soft Nanoscience, Universität Münster, 48149 Münster, Germany — ²DAMTP, Centre for Mathematical Sciences, University of Cambridge, Cambridge CB3 0WA, United Kingdom

While the collective dynamics of spherical active Brownian particles is relatively well understood by now, the much more complex dynamics of nonspherical active particles still raises interesting open questions. Previous work has shown that the dynamics of rod-like or ellipsoidal active particles can differ significantly from that of spherical ones. In this work [1], we obtain the full state diagram of active Brownian ellipsoids depending on the Péclet number and packing density via computer simulations. The system is found to exhibit a rich state behavior that includes cluster formation, local polar order, polar flocks, and disordered states. Moreover, we obtain numerical results and an analytical representation for the pair-distribution function of active ellipsoids. This function provides useful quantitative insights into the collective behavior of active particles with lower symmetry and has potential applications in the development of predictive theoretical models.

[1] S. Bröker, M. te Vrugt, and R. Wittkowski, arXiv:2307.15535 (2023)

*Funded by the Deutsche Forschungsgemeinschaft (DFG) under Project-IDs 525063330 (MtV) and 283183152 (WI 4170/3) (RW).

Keywords: Active matter; Ellipsoidal particles; Pair-distribution function; Brownian dynamics simulations