Electron Spin Resonance of the Interacting Spinon Liquid

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.

arXiv commentMain text (6 pages, 2 figures) + Supplemental material (15 pages, 7 figures)

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Cited by in corpus (5)

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• Hydrodynamics of interacting spinons in the magnetized spin-$1/2$ chain with the uniform Dzyaloshinskii-Moriya interaction
• Collective spin oscillations in a magnetized graphene sheet
• One-dimensional magnetism in synthetic Pauflerite, $\beta$-VOSO${}_4$