Dynamical Properties of a Haldane Gap Antiferromagnet

Details Dynamical Properties of a Haldane Gap Antiferromagnet Dynamical Properties of a Haldane Gap Antiferromagnet

1992-12-09

arxiv.org/abs/cond-mat/9212014v1

J.Phys.Condens.Matter 5 (1993) 1399-1410

Physics

Condensed Matter

14 pages, SphT/92-135 plain tex with Postscript figures included. Postscipt file available by anonymous ftp at amoco.saclay.ce

Scientific paper

10.1088/0953-8984/5/9/024

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 Lancz\H os 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.

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