Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/81287
Type: Artigo de periódico
Title: LOCALIZED-VERSUS-EXTENDED SPIN FLUCTUATIONS IN QUANTUM ANTIFERROMAGNETS
Author: CABRERA, GG
Abstract: A recently devised trial wave function for the Heisenberg-Ising model is tested against linear spin waves in the whole anisotropic region. The above wave function is asymptotically exact in the limit of high anisotropy, and is constructed using localized spin fluctuations over Neel states. The structure of this trial state is compared with the one presented by the zero-point state of the linear-spin-wave theory. Striking similarities are found between both, despite that spin waves represent fluctuations that encompass the whole system. A crossover between both approaches near the isotropic point is attributed to a delocalization of spin fluctuations. We present results for one and two dimensions, and compare with exact results or numerical simulations.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.43.13476
Date Issue: 1991
Appears in Collections:Unicamp - Artigos e Outros Documentos

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