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Direct Evidence for Fermi Statistics from Proximity to the Kitaev Spin Liquid in RuCl3
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A key characteristic of quantum spin liquids(QSL) is the presence of fractional excitations related to their entanglement properties, yet experimental verification of their statistics is missing. For example, in the potential Kitaev spin liquid, RuCl3 experiments uncovered signs of fractional particles, though not their Fermi statistics. Here we employ Raman scattering to reveal the true nature of the magnetic excitations, using improved experimental methods and analysis to remove the influence of laser heating and thermal fluctuations. Via the energy loss and gain spectra, we extract the energy and temperature dependence of the Raman susceptibility to prove RuCl3's magnetic response is given by pair creation of fermionic excitations. Furthermore, by comparing with quantum Monte Carlo (QMC) results for the exact Kitaev limit, we are able to discern the energy and temperature range where additional interaction terms are important. Our results open new directions in QSL research by providing a new way to investigate fractional excitations and the importance of terms causing spinon confinement.
Forward citations
Cited by 3 Pith papers
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High-Field Quantum Disordered State in $\alpha$-RuCl3: Spin Flips, Bound States, and a Multi-Particle Continuum
The high-field phase of α-RuCl3 is a partially polarized quantum disordered state with a single spin-flip mode, a two-particle bound state, and a gapped continuum.
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Polarization-resolved Raman spectroscopy of {\alpha}-RuCl3 and evidence of room temperature two-dimensional magnetic scattering
Raman polarization data resolve the full phonon spectrum of α-RuCl3 and show that the magnetic continuum is two-dimensional and persists to room temperature, consistent with Kitaev spin-liquid physics.
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Hunting Majorana Fermions in Kitaev Magnets
A review of theoretical and experimental evidence that Kitaev magnets exhibit thermal fractionalization into Majorana fermions and Z2 fluxes, with the half-quantized thermal Hall effect as the strongest proposed signature.
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