Vortices in Schwinger-Boson mean-field theory of two-dimensional quantum antiferromagnets

Journal Article · Sun Oct 01 00:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.9491· OSTI ID:249431

Ng, T ^[1]

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1. Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay Road, Kowloon (Hong Kong)

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.

• OSTI ID: 249431
• Journal Information: Physical Review, B: Condensed Matter, Vol. 52, Issue 13; Other Information: PBD: 1 Oct 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HIGH-TC SUPERCONDUCTORS
ANTIFERROMAGNETISM
SPIN WAVES
CRYSTAL LATTICES
SQUARE CONFIGURATION
QUANTIZATION
PHOTOEMISSION
MAGNETIC PROPERTIES
ORDER PARAMETERS
HEISENBERG MODEL
MAGNETIC FLUX
SCHWINGER FUNCTIONAL EQUATIONS