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Field-induced dynamical properties of the $XXZ$ model on a honeycomb lattice
- Source :
- Physical Review B, vol 93, iss 1, Maksimov, PA; & Chernyshev, AL. (2016). Field-induced dynamical properties of the XXZ model on a honeycomb lattice. Physical Review B, 93(1), 014418. doi: 10.1103/PhysRevB.93.014418. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/07t3z5hk
- Publication Year :
- 2015
- Publisher :
- arXiv, 2015.
-
Abstract
- We present a comprehensive $1/S$ study of the field-induced dynamical properties of the nearest-neighbor $XXZ$ antiferromagnet on a honeycomb lattice using the formalism of the nonlinear spin-wave theory developed for this model. The external magnetic field controls spin frustration in the system and induces non-collinearity 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.<br />Comment: 19 pages, 17 figures
- Subjects :
- media_common.quotation_subject
Fluids & Plasmas
Frustration
FOS: Physical sciences
02 engineering and technology
Spin structure
01 natural sciences
Condensed Matter - Strongly Correlated Electrons
Engineering
Quantum mechanics
0103 physical sciences
Antiferromagnetism
010306 general physics
media_common
Physics
Condensed matter physics
Strongly Correlated Electrons (cond-mat.str-el)
Magnon
021001 nanoscience & nanotechnology
Brillouin zone
Physical Sciences
Chemical Sciences
Quasiparticle
Condensed Matter::Strongly Correlated Electrons
cond-mat.str-el
0210 nano-technology
Structure factor
Excitation
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Physical Review B, vol 93, iss 1, Maksimov, PA; & Chernyshev, AL. (2016). Field-induced dynamical properties of the XXZ model on a honeycomb lattice. Physical Review B, 93(1), 014418. doi: 10.1103/PhysRevB.93.014418. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/07t3z5hk
- Accession number :
- edsair.doi.dedup.....ac260ce64d1aab1c0b600641e4f19cd0
- Full Text :
- https://doi.org/10.48550/arxiv.1510.04275