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research article
Field-induced decay dynamics in square-lattice antiferromagnets
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.
Type
research article
Web of Science ID
WOS:000282359000003
Authors
Publication date
2010
Published in
Volume
82
Issue
14
Article Number
144402
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
December 2, 2010
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