Field-induced decay dynamics in square-lattice antiferromagnet

Details Field-induced decay dynamics in square-lattice antiferromagnet Field-induced decay dynamics in square-lattice antiferromagnet

2010-06-24

arxiv.org/abs/1006.4838v2

Phys. Rev. B, 82, 144402 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 11 figures, final version

Scientific paper

10.1103/PhysRevB.82.144402

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.

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