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Updated: Sep 22, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Electron Spin Resonance of the Interacting Spinon Liquid
Kirill Yu Povarov1, Timofei A Soldatov2, Ren-Bo Wang3
1Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland.
Abstract:
We report experimental verification of the recently predicted collective modes of spinons, stabilized by backscattering interaction, in a model quantum spin chain material. We exploit the unique geometry of uniform Dzyaloshinskii-Moriya interactions in K_{2}CuSO_{4}Br_{2} to measure the interaction-induced splitting between the two components of the electron spin resonance (ESR) response doublet. From that we directly determine the magnitude of the "marginally irrelevant" backscattering interaction between spinons for the first time.
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