We determine the excitations and S matrix of an integrable isotropic antiferromagnetic quantum spin chain of alternating spin 1/2 and spin 1. There are two types of gapless one-particle excitations: the usual spin 1/2 (``spinor'') kink, and a new spin 0 (``scalar'') kink. Remarkably, the scalar-spinor scattering is nontrivial, yet the spinor-spinor scattering is the same as if the scalar kinks were absent. Moreover, there is no scalar-scalar scattering.
@article{arxiv.hep-th/9402053,
title = {Scalar Kinks},
author = {H. J. de Vega and Luca Mezincescu and Rafael I. Nepomechie},
journal= {arXiv preprint arXiv:hep-th/9402053},
year = {2015}
}
Comments
17 pages, no figures, plain TEX, LPTHE-PAR 94-04, UMTG-174