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Author Feng, S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ ANTIFERROMAGNETISM ♦ HEISENBERG MODEL ♦ SPIN WAVES ♦ COLLECTIVE EXCITATIONS ♦ MEAN-FIELD THEORY ♦ ENERGY GAP ♦ GROUND STATES ♦ RANDOM PHASE APPROXIMATION ♦ MAGNETIZATION ♦ SELF-CONSISTENT FIELD
Abstract The ground-state properties and spin excitation spectrum of the Heisenberg model are studied within the framework of the two-dimensional Jordan-Wigner theory. The mean-field state with the lowest energy is the magnetized {pi}-flux state with a gap in the spin excitation spectrum. It is shown that this mean-field gap is decreased significantly by considering amplitude fluctuations in the random-phase approximation (RPA). The RPA ground-state energy and staggered magnetization are {ital E}{sub 0}={minus}0.332{ital J} per bond and {ital M}=0.327, respectively, which are very close to the best numerical estimates. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-05-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 17


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