Exceptional dynamics of interacting spin liquids

Abstract

We show that interactions in quantum spin liquids can result in non-Hermitian phenomenology that differs qualitatively from mean-field expectations. We demonstrate this in two prominent cases through the effects of phonons and disorder on a Kitaev honeycomb model. Using analytic and numerical calculations, we show the generic appearance of exceptional points and rings depending on the symmetry of the system. Their existence is reflected in dynamical observables including the dynamic structure function measured in neutron scattering. The results point to new phenomenological features in realizable spin liquids that must be incorporated into the analysis of experimental data and also indicate that spin liquids could be generically stable to wider classes of perturbations.

arXiv comment6+10 pages, 3+4 figure, MIT-CTP/5402

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Cited by in corpus (9)

• Homotopy, Symmetry, and Non-Hermitian Band Topology
• Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet
• Enhanced eigenvector sensitivity and algebraic classification of sublattice-symmetric exceptional points
• Entanglement transitions in a periodically driven non-Hermitian Ising chain
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• Dissipative Yao-Lee Spin-Orbital Model: Exact Solvability and $\mathcal{P}\mathcal{T}$ Symmetry Breaking
• Magnetic field effects on the Kitaev model coupled to environment