Variational coupled-cluster study of plasmonlike excitations in quantum antiferromagnets
[摘要] We study plasmonlike excitations in quantum antiferromagnets by the recently proposed variational coupled-cluster method. Within our approximation, we find that these spin-zero excitations have a nonzero energy gap in a cubic lattice and are gapless in a square lattice, similar to the plasmons in quantum electron gases.
[发布日期] 2006-12-01 [发布机构]
[效力级别] [学科分类]
[关键词] LONGITUDINAL SPIN FLUCTUATIONS;SQUARE-LATTICE ANTIFERROMAGNET;HEISENBERG-ANTIFERROMAGNET;EXCITED-STATES;WAVE THEORY;EXTENSION;FORMALISM;SYSTEMS [时效性]
