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SYBS: Symposium Fluids with Broken Time-Reversal Symmetry: Odd/Hall Viscosity between Active Matter and Electron Flows

SYBS 1: Fluids with broken time-reversal symmetry: Odd/Hall viscosity between active matter and electron flows

SYBS 1.3: Hauptvortrag

Dienstag, 10. März 2026, 10:30–11:00, HSZ/AUDI

Odd slip on chiral active surfaces — •Andrej Vilfan¹ and Yuto Hosaka² — ¹Jožef Stefan Institute, Ljubljana, Slovenia — ²Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany

Chiral active surfaces are characterized by persistent energy input with a defined sense of chirality, for example by a carpet of symmetrically rotating biological or artificial cilia. We demonstrate that when subjected to a shear flow, such a surface can lead to an effective odd slip velocity, in addition to classical Navier slip. Odd Navier slip represents a novel category of odd responses beyond the established concepts of odd viscosity and elasticity, which occur in bulk fluids or solids, and odd diffusivity of point particles. We show that a suspension of particles with odd slip can exhibit odd viscosity, providing a new mechanism for its emergence.

Keywords: odd viscosity; active matter; low Reynolds number hydrodynamics