Dresden 2026 – wissenschaftliches Programm

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SYQF: Symposium Interacting Degrees of Freedom in Ultrathin Quantum Films

SYQF 1: Interacting Degrees of Freedom in Ultrathin Quantum Films

SYQF 1.3: Hauptvortrag

Freitag, 13. März 2026, 10:30–11:00, HSZ/AUDI

Magnetism, light and matter - Role of excitons in two-dimensional magnets — •Florian Dirnberger — Zentrum für QuantumEngineering (ZQE), Technical University of Munich, Garching, Germany — Department of Physics, TUM School of Natural Sciences, Technical University of Munich, Munich, Germany

Studies on van der Waals magnetic materials have recently unveiled a rare type of optical quasiparticle formed by spin-polarized electronic states in magnets. With properties that have no analogue among excitons in conventional semiconductors, these so-called magnetic excitons offer a compelling playground to explore the interplay between magnetism, light and matter.

In this talk, I will review the magneto-optical properties of excitonic van der Waals magnets, with a particular focus on recent work on the antiferromagnetic insulator CrSBr. This archetypal layered magnet provides key insights into how magnetic order alters excitonic responses, and how excitons in turn influence magnetic dynamics. It further enables experiments to probe magnetic excitons in the regime of strong light-matter coupling, bringing concepts from photonics into the picture. Optical spectroscopy reveals pronounced exciton responses to applied magnetic fields, dynamic coupling between excitons and both coherent and incoherent magnons, and magnon-induced excitonic correlations. Together, these results open new directions for magneto-optics and highlight opportunities to control magnetically correlated quantum materials through strong light-matter interactions.