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Subject Keyword PHYSICS ♦ HIGH-TC SUPERCONDUCTORS ♦ ANTIFERROMAGNETISM ♦ SPIN WAVES ♦ CRYSTAL LATTICES ♦ SQUARE CONFIGURATION ♦ QUANTIZATION ♦ PHOTOEMISSION ♦ MAGNETIC PROPERTIES ♦ ORDER PARAMETERS ♦ HEISENBERG MODEL ♦ MAGNETIC FLUX ♦ SCHWINGER FUNCTIONAL EQUATIONS
Abstract We study the properties of vortices in two-dimensional quantum antiferromagnets with spin magnitude {ital S} on a square lattice within the framework of Schwinger-boson mean-field theory. Based on a continuum description, we show that vortices are stable topological excitations in the disordered state of quantum antiferromagnets. Furthermore, we argue that vortices can be divided into two kinds: the first kind always carries zero angular momentum and are bosons, whereas the second kind carries angular momentum {ital S} under favorable conditions and are fermions if {ital S} is half-integer. A plausible consequence of our results relating to the resonating-valence-bond theories of high-{ital T}{sub {ital c}} superconductors is pointed out.
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-10-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 52
Issue Number 13


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