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arXiv · 2606.18513

Magnon-dislon hybridization in magnetic insulators

Carlos Saji·Nicolas Vidal-Silva·Roberto E. Troncoso
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Abstract

Spin dynamics in ordered magnets with topological lattice defects is investigated. Using fracton--elasticity duality, we develop an effective field theory of magnons coupled to quantized lattice dislocations (dislons) in magnetic insulators. Within this framework, an elastic gauge field mediates a nonlocal interaction between dislocations and magnetization gradients. The resulting magnetoelastic coupling gives rise to coherent magnon-dislon hybridization whose properties are dictated by dislocation topology. Screw dislocations exhibit helicity-selective hybridization and symmetry-protected dark dislon sectors, while edge dislocations generate anisotropic hybrid excitations with finite spin-precession ellipticity through the glide constraint. Our results establish dislocations as dynamical topological defects with directly observable polarization fingerprints in magnon spectra, and reveal magnon-dislon hybridization as a new route to control spin dynamics.

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Carlos Saji, Nicolas Vidal-Silva, Roberto E. Troncoso. 2026-06-16. Magnon-dislon hybridization in magnetic insulators. https://arxiv.org/abs/2606.18513

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