Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 34: Focus Session: Fluids with Broken Time-Reversal Symmetry – Odd/Hall Viscosity Between Active Matter and Electron Flows

Wednesday, March 11, 2026, 09:30–12:30, ZEU/0160

Viscosity is a fundamental property of fluids and an important physical quantity characterizing resistance to flow and energy dissipation. While time-reversal symmetry holds in conventional fluids, its violation can lead to striking phenomena, one of which is the emergence of a dissipationless transport coefficient called odd viscosity. Odd viscosity, also known as Hall viscosity, was originally proposed by Avron et al., as a quantized observable in electron fluids with a magnetic field. Since this seminal work, odd viscosity has been studied in various systems, such as 2D electron fluids, fractional Hall fluids, and ionic crystals. Although odd viscosity was also known in plasma physics, it was largely overlooked in fluid dynamics, mainly due to the technical challenges involved in its experimental realization. In recent years, however experiments in driven colloidal systems led to a surge of interest in odd viscosity in the active matter community. In parallel, our understanding of odd phenomena was advanced by continuum theories with many novel exact solutions. Major open questions in the field include the microscopic mechanisms that lead to odd viscosity, its experimental manifestations, the transition from two- to three-dimensional systems, and the effect of odd viscosity on hydrodynamic phenomena at different length scales, ranging from microrheology to turbulent flows. This Focus Session will connect the wider condensed matter and active matter physics communities with recent theoretical advances in odd viscosity. It is organized along with a Symposium on the same topic.

Organized by Yuto Hosaka (Göttingen) and Ewelina M. Hankiewicz (Würzburg)

	09:30	DY 34.1	Invited Talk: Active turbulence and odd viscosity in a colloidal chiral active system in bulk and in patterned environments — Joscha Mecke, Yongxiang Gao, and •Marisol Ripoll
	10:00	DY 34.2	From Gels to Rotors: Tunable Chiral Phases in Odd Colloidal Fluids — •Dennis Schorn, Stijn van der Ham, Suvendu Mandal, Benno Liebchen, and Hanumantha Rao Vutukuri
	10:15	DY 34.3	Odd Droplets: Fluids with Odd Viscosity and Highly Deformable Interfaces — •Hugo França and Maziyar Jalaal
	10:30	DY 34.4	The notion of dissipation in three-dimensional fluids with odd viscosity — •Jeffrey Everts, Laura Meissner-Oszer, and Bogdan Cichocki
	10:45	DY 34.5	Exact flow patterns in systems with odd viscosity — •Laura Meissner-Oszer, Bogdan Cichocki, and Jeffrey Everts
	11:00		15 min. break
	11:15	DY 34.6	Resonances in Odd Viscoelastic Materials — •Julius Kiln and Alexander Mietke
	11:30	DY 34.7	Edge currents shape condensates in chiral active matter — •Boyi Wang, Patrick Pietzonka, and Frank Jülicher
	11:45	DY 34.8	A mobility based approach to self diffusion in odd-mobile systems — •Filippo Faedi and Abhinav Sharma
	12:00	DY 34.9	Exceptional points, chirality and entropy production in nonreciprocal polar active matter — Kim L. Kreienkamp and •Sabine H. L. Klapp
	12:15	DY 34.10	The chiral random walk: A model for odd transport on the lattice — Jan Wójcik and •Erik Kalz