Hydrodynamic relation in 2D Heisenberg antiferromagnet in a field

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The spin-stiffness ρ_s of a 2D Heisenberg antiferromagnet depends non-analytically on external magnetic field. We demonstrate that the hydrodynamic relation between ρ_s, the uniform susceptibility χ, and the spin-wave velocity $c$ is not violated by such a behavior because similar non-analytic terms from all three quantities mutually cancel out. In this work, explicit expressions for the field-dependent spin stiffness and for the magnon velocity of the 2D square lattice antiferromagnet are obtained by direct calculation to order 1/S and in the whole range of magnetic fields.
5*(1-ε) pages, 5 figures

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/229019

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0902.4455
 http://arxiv.org/abs/0902.4455
 Phys. Rev. B 79, 174402 (2009); another winner of the PRB beauty contest.
 doi:10.1103/PhysRevB.79.174402

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arXiv