Regensburg 2025 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 17: Poster Session II

BP 17.3: Poster

Dienstag, 18. März 2025, 18:00–20:30, P4

Modeling dynamics and density distribution of magnetotactic bacteria in traps — •Theo Richter, Sascha Lambert, and Stefan Klumpp — Institut für Dynamik komplexer Systeme, Universität Göttingen, Göttingen, Germany

Magnetotactic bacteria are microorganisms that navigate using internal magnetosomes, aligning them along magnetic fields. They represent an intriguing model system for studying active Brownian particle dynamics under an external alignment field. Previous studies have analyzed their movement through crowded channels, where the orientation along the magnetic field and their interaction with obstacles prove to be important mechanisms for navigation. In such complex environments, bacteria often find themselves trapped in corners, where the dynamics of how they escape these traps are crucial and remain mostly unexplored.

In this work, we aim to understand the density profiles, escape rate and general dynamics of single active Brownian particles under an alignment field inside trapping geometries. We investigate these quantities via simulations in varying trap geometries, with a focus on triangular traps, characterizing the effects of system parameters such as magnetic field strength and particle-wall interactions. We relate the behavior of the bacteria in these geometries to the sedimentation of active Brownian particles.

Keywords: Active Brownian Particles; Magnetotaxis; Motility; Non-Equilibrium