Regensburg 2025 – wissenschaftliches Programm
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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: Vortrag
Mittwoch, 19. März 2025, 16:30–16:45, H43
Odd mobility in interacting particle systems — •Erik Kalz1, Shashank Ravichandir2, Johannes Birkenmeier1, Ralf Metzler1, and Abhinav Sharma2,3 — 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