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Dynamical Properties of a Haldane Gap Antiferromagnet | | O. Golinelli
; Th. Jolicoeur
; R. Lacaze
; | | Date: |
9 Dec 1992 | | Journal: | J.Phys.Condens.Matter 5 (1993) 1399-1410 | | Subject: | cond-mat hep-lat | | Abstract: | We study the dynamic spin correlation function of a spin one antiferromagnetic chain with easy-plane single-ion anisotropy. We use exact diagonalization by the Lanczos method for chains of lengths up to N=16 spins. We show that a single-mode approximation is an excellent description of the dynamical properties. A variational calculation allows us to clarify the nature of the excitations. The existence of a two-particle continuum near zero wavevector is clearly seen both in finite-size effects and in the dynamical structure factor. The recent neutron scattering experiments on the quasi-one-dimensional antiferromagnet NENP are fully explained by our results. | | Source: | arXiv, cond-mat/9212014 | | Services: | Forum | Review | PDF | Favorites | |
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