Regensburg 2025 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 24: Focus Session: Broken Symmetries in Statistical Physics - Dynamics of Odd Systems

DY 24.6: Talk

Wednesday, March 19, 2025, 16:30–16:45, H43

Odd mobility in interacting particle systems — •Erik Kalz¹, Shashank Ravichandir², Johannes Birkenmeier¹, Ralf Metzler¹, and Abhinav Sharma^2,3 — ¹University of Potsdam — ²IPF, Dresden — ³University of Augsburg

Colloidal mobility characterises the response of an overdamped particle to an external drift. We present a many-body theory where the diffusion of particles is modelled in the presence of interactions with other colloids. A tracer particle therefore can respond to its own applied force as well as to the external drift of the host particles, an effect transferred via particle-particle interactions. We examine these direct and transferred mobilities in the context of odd systems and show that they display qualitatively different behaviours. Odd systems are characterized by a transverse --- Hall-like response which occurs in addition to the ordinary, parallel response. We show that both components, the parallel and transverse are drastically altered by particle-particle interactions up to a complete reversal for each component. Our findings are validated by Brownian dynamics simulations.

Keywords: odd mobility; overdamped Hall effect; many-body system; Fokker-Planck equation