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.

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

References in corpus (6)

• Exact edge singularities and dynamical correlations in spin-1/2 chains
• Spin-orbital effects in magnetized quantum wires and spin chains
• Dynamically dominant excitations of string solutions in the spin-1/2 antiferromagnetic Heisenberg chain in magnetic fields
• Quantum spin chains with frustration due to Dzyaloshinskii-Moriya interactions
• Spinon magnetic resonance of quantum spin liquids
• Ising order in a magnetized Heisenberg chain subject to a uniform Dzyaloshinskii-Moriya interaction

Cited by in corpus (5)

• Photon echo and fractional excitation lensing of $S=1/2$ XY spin chain
• Dimensional reduction and incommensurate dynamic correlations in the $S=\frac{1}{2}$ triangular-lattice antiferromagnet Ca${}_3$ReO${}_5$Cl${}_2$
• 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${}_4$