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Field-induced decay dynamics in square-lattice antiferromagnets
- Source :
- Physical Review B. 82
- Publication Year :
- 2010
- Publisher :
- American Physical Society (APS), 2010.
-
Abstract
- Dynamical properties of the square-lattice Heisenberg antiferromagnet in applied magnetic field are studied for arbitrary value S of the spin. Above the threshold field for two-particle decays, the standard spin-wave theory yields singular corrections to the excitation spectrum with logarithmic divergences for certain momenta. We develop a self-consistent approximation applicable for S >= 1, which avoids such singularities and provides regularized magnon decay rates. Results for the dynamical structure factor obtained in this approach are presented for S = 1 and S = 5/2.<br />12 pages, 11 figures, final version
- Subjects :
- Physics
Strongly Correlated Electrons (cond-mat.str-el)
Field (physics)
Magnon
FOS: Physical sciences
Condensed Matter Physics
Square lattice
Electronic, Optical and Magnetic Materials
Magnetic field
Condensed Matter - Strongly Correlated Electrons
Spin wave
Quantum electrodynamics
Quantum mechanics
Condensed Matter::Strongly Correlated Electrons
Structure factor
Excitation
Spin-½
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 82
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....77925e67fa7852a18792d5e9dece2f3a