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Fictitious fluxes in doped antiferromagnets

Journal article
Authors Stellan Östlund
Published in Physical Review B
Volume 65
Pages 094408
ISSN 1098-0121
Publication year 2002
Published at Department of Physics (GU)
Pages 094408
Language en
Subject categories Physical Sciences, Condensed Matter Physics, Superconductivity

Abstract

In a tight binding model of charged spin-12 electrons on a square lattice, a fully polarized ferromagnetic spin con^Lguration generates an apparent U(1) ux given by 2^Y times the skyrmion charge density of the ferromagnetic order parameter. We show here that for an antiferromagnet, there are two \^Lctitious" magnetic ^Lelds, one staggered and one unstaggered. The staggered topological ux per unit cell can be varied with a negligible change in the value of the e^Kective nearest neighbor coupling constant whereas the magnitude of the unstaggered ux is strongly coupled to the magnitude of the e^Kective coupling.

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