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- W2213144834 abstract "We present a comprehensive $1/S$ study of the field-induced dynamical properties of the nearest-neighbor $mathit{XXZ}$ antiferromagnet on a honeycomb lattice using the formalism of nonlinear spin-wave theory developed for this model. The external magnetic field controls spin frustration in the system and induces noncollinearity of the spin structure, which is essential for the two-magnon decay processes. Our results include an intriguing field-evolution of the regions of the Brillouin zone wherein decays of spin excitations are prominent, a detailed classification of the decay channels involving magnons from both excitation branches, and a thorough analysis of the singularities in the magnon spectra due to coupling to the two-magnon continuum, all of which are illustrated for several field and anisotropy values. We highlight a number of features related to either the non-Bravais nature of the lattice or the existence of the Dirac-like points in the spectrum. In addition, the asymptotic behavior of the decay rates near high-symmetry points is analyzed in detail. The inelastic neutron-scattering spin-spin structure factor is obtained in the leading $1/S$ order and is shown to exhibit qualitatively distinct fingerprints of the decay-induced magnon dynamics such as quasiparticle peaks broadened by decays and strong spectral weight redistribution." @default.
- W2213144834 created "2016-06-24" @default.
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- W2213144834 date "2016-01-13" @default.
- W2213144834 modified "2023-09-30" @default.
- W2213144834 title "Field-induced dynamical properties of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi mathvariant=italic>XXZ</mml:mi></mml:math>model on a honeycomb lattice" @default.
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- W2213144834 doi "https://doi.org/10.1103/physrevb.93.014418" @default.
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