Dynamics of Thermal Effects in the Spin-Wave Theory of Quantum Antiferromagnets

Details Dynamics of Thermal Effects in the Spin-Wave Theory of Quantum Antiferromagnets Dynamics of Thermal Effects in the Spin-Wave Theory of Quantum Antiferromagnets

2011-12-14

arxiv.org/abs/1112.3158v2

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex4 file, color figures. Updated version with typos corrected. A new appendix added with more explanations and calculation

Scientific paper

We derive a master equation which 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 spoilt even if the coupling is fully isotropic.

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