Effective spin-wave action for ordered Heisenberg antiferromagnets in a magnetic field

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dc.creatorHasselmann, Nils
dc.creatorSchuetz, Florian
dc.creatorSpremo, Ivan
dc.creatorKopietz, Peter
dc.date2005-11-29
dc.date.accessioned2026-07-07T07:54:00Z
dc.date.available2026-07-07T07:54:00Z
dc.descriptionWe derive the effective long-wavelength Euclidean action for the antiferromagnetic spin-waves of ordered quantum antiferromagnets subject to a uniform magnetic field. We point out that the magnetic field dependence of the spin-wave dispersion predicted by the usual O(3)-quantum nonlinear sigma model disagrees with spin-wave theory. We argue that the nonlinear sigma model does not take into account all relevant spin-wave interactions and derive a modified effective action for the long-wavelength spin-waves which contains an additional quartic interaction. At zero temperature the corresponding vertex is relevant in the renormalization group sense below three dimensions.
dc.description4 pages, 1 eps figure; proceedings of the symposium on "Spin- and charge-correlations in molecule-based materials", October 2005, Koenigstein (Taunus), Germany
dc.identifierhttps://arxiv.org/abs/cond-mat/0511706
dc.identifierhttp://arxiv.org/abs/cond-mat/0511706
dc.identifierComptes Rendus Chimie 10, 60 (2007)
dc.identifierdoi:10.1016/j.crci.2006.06.008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/126438
dc.subjectStrongly Correlated Electrons
dc.titleEffective spin-wave action for ordered Heisenberg antiferromagnets in a magnetic field
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