Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Correlated Magnetism – Spin Liquids

TT 33.3: Talk

Wednesday, March 19, 2025, 15:30–15:45, H33

Raman Circular Dichroism of Chiral Quantum Spin Liquids — •Eduard Koller^1,2,3, Valentin Leeb^1,3, Natalia Perkins⁴, and Johannes Knolle^1,3,5 — ¹Technical University of Munich, Germany — ²Institute for Advanced Study, TUM, Germany — ³Munich Center for Quantum Science and Technology, Germany — ⁴School of Physics and Astronomy, University of Minnesota, USA — ⁵Blackett Laboratory, Imperial College London, United Kingdom

We investigate the Raman circular dichroism (RCD) of chiral Quantum spin liquids as a probe of the topological properties of fractionalised spin excitations. Starting from the Loudon Fleury formalism we show that the scattering Intensity is directly related to the light matter coupling formalism of spinon bands. We reveal that the RCD signal arises as a result of the Berry curvature and Quantum geometry contributions. We show application to different model quantum spin liquids.

Keywords: Quantum Geometric Tensor; Raman Scattering; Raman Circular Dichroism; Chiral Quantum spin liquids