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Motivated by field-theoretic predictions we investigate the stable excitations that exist in two characteristic gapped phases of a spin-1 model with Ising-like and single-ion anisotropies. The sine-Gordon theory indicates a region close to the phase boundary where a stable breather exists besides the stable particles, that form the Haldane triplet at the Heisenberg isotropic point. The numerical data, obtained by means of the Density Matrix Renormalization Group, confirm this picture in the so-called large-D phase for which we ...
EDP sciences
Publication date: 
1 Sep 2006

L Campos Venuti, C Degli Esposti Boschi, Elisa Ercolessi, Giuseppe Morandi, Fabio Ortolani, Stefano Pasini, Marco Roncaglia

Biblio References: 
Volume: 53 Issue: 1 Pages: 11-18
The European Physical Journal B-Condensed Matter and Complex Systems