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Dynamics of thermal effects in the spin-wave theory of quantum antiferromagnets

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Rivas Vargas, Ángel and Martín-Delgado Alcántara, Miguel Ángel (2013) Dynamics of thermal effects in the spin-wave theory of quantum antiferromagnets. Annals of physics, 331 . pp. 9-23. ISSN 0003-4916

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Official URL: http://dx.doi.org/10.1016/j.aop.2012.09.012




Abstract

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.


Item Type:Article
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© 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.

Uncontrolled Keywords:Ferromagnetism; Dependence; La2CuO4; System.
Subjects:Sciences > Physics > Physics-Mathematical models
ID Code:47626
Deposited On:22 May 2018 07:01
Last Modified:22 May 2018 08:25

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