Publication: Dynamics of thermal effects in the spin-wave theory of quantum antiferromagnets
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We derive a master equation that allows us to study non-equilibrium dynamics of a quantum antiferromagnet. By resorting to spin-wave theory, we obtain a closed analytic form for the magnon decay rates. These turn out to be closely related to form factors, which are experimentally accessible by means of neutron and Raman scattering. Furthermore, we compute the time evolution of the staggered magnetization showing that, for moderate temperatures, the magnetic order is not spoiled even if the coupling is fully isotropic.
© 2012 Elsevier Inc. We thank the Spanish MICINN grant FIS2009-10061, CAM research consortium QUITEMAD S2009-ESP1594, European Commission PICC: FP7 2007-2013, Grant No. 249958, UCM-BS grant GICC-910758.