On the Sz=0 excited states of an anisotropic Heisenberg chain
- 1 September 1982
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 15 (9) , 2985-2996
- https://doi.org/10.1088/0305-4470/15/9/044
Abstract
The Sz=0 excited states of the anisotropic antiferromagnetic Heisenberg Hamiltonian H= Sigma j=1N(SjxSj+1x+SjySj+1y+ rho SjzSj+1z) are studied when 0<or= rho <or=1. The original set of secular equations is reduced to a simpler one, which contains the parameters of excitations only. The energy-momentum dispersion is also found. It is shown that the typical low-lying excitations are either two-strings or not of string form. The simplest excitations are described in more detail.Keywords
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