Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/53069
Type: Artigo de periódico
Title: Magnon anomalous interactions from SU(2) gauge symmetry: Are magnons 'charged' under spin?
Author: Dartora, CA
Cabrera, GG
Abstract: The Pauli-Schrodinger non-relativistic theory of spin-1/2 charged fermions requires invariance under the U(1) x SU(2) gauge group. The U(1) symmetry responds for the usual coupling of a charged particle to the electromagnetic gauge potentials A(mu), while the spin interactions with the electromagnetic fields are obtained by changing the status of the global SU(2) rotational invariance of the Pauli-Schrodinger Lagrangian density to a local SU(2) gauge symmetry, for which the electric and magnetic fields E and B play the role of gauge potentials. Assuming that local gauge invariance under rotations can be applied to an arbitrary spin-S quantum field we extend the SU(2) gauge symmetry to the magnon field theory of Heisenberg ferromagnets. It is shown that the magnon field couples to the corresponding gauge fields, E and B, yielding 'anomalous' interactions of magnons with the electric component of the electromagnetic field, as in the case of charged excitations. (C) 2009 Elsevier B.V. All rights reserved.
Subject: Magnons
Gauge field theory
Pauli-Schroedinger non-relativistic theory
SU(2) gauge symmetry
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.physb.2009.11.027
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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