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DY: Fachverband Dynamik und Statistische Physik

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

DY 24.1: Hauptvortrag

Mittwoch, 19. März 2025, 15:00–15:30, H43

Dynamics of odd and chiral active systems — •Hartmut Löwen — Heinrich-Heine-Universität Düsseldorf

After a brief introduction into "odd" systems characterized by odd viscosity, odd elasticity or odd diffusivity, we focus on odd diffusive dynamics. For normal diffusive systems, repulsive interactions typically reduce the dynamics as signalled by a reduction of the long-time self-diffusion coefficient. Contrarily, in odd-diffusive systems, collisions can enhance the self-diffusion due to a mutual rolling effect. We further address active chiral particles which break the discrete left-right symmetry in their motion. Examples include spinners, circle swimmers and particles moving on helical trajectories. We explore phase separation, glassy dynamics as well as crystallization and polymerisation in these chiral systems. New phenomena absent for achiral objects are observed including active surfactants, rotating crystallites, self-wrapping of chiral polymers and a hammering effect in supercooled fluids. Also the realization of such odd systems in granular or colloidal experiments is discussed.

Keywords: odd diffusivity; active matter; colloids; chiral dynamics; granular matter