Scalar Kinks

Abstract

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.

17 pages, no figures, plain TEX, LPTHE-PAR 94-04, UMTG-174

References in corpus (1)

• Thermodynamics of Integrable Chains with Alternating Spins

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