Electron Spin Resonance of the Interacting Spinon Liquid
Kirill Yu. Povarov, Timofei A. Soldatov, Ren-Bo Wang, Andrey Zheludev,, Alexander I. Smirnov, Oleg A. Starykh
TL;DR
This paper experimentally verifies the collective modes of spinons in a quantum spin chain, measuring the backscattering interaction that stabilizes these modes using electron spin resonance in a specific material.
Contribution
It provides the first direct measurement of the backscattering interaction between spinons in a quantum spin chain.
Findings
Measured the ESR doublet splitting in K₂CuSO₄Br₂
Quantified the backscattering interaction magnitude
Confirmed the existence of interaction-stabilized spinon modes
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 KCuSOBr 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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