Exact trimer ground states on a spin-1 chain
Research Institute for Solid State Physics and Optics
H-1525 Budapest, P.O. Box 49, Hungary
2 Institut für Theoretische Physik, Universität zu Köln Zülpicherstr. 77, 50937 Köln, Germany
Accepted: 28 February 2000
We construct for the first time a spin-1 model on a chain, which has an exactly solvable threefold degenerate ground state. The ground-state wave function breaks translational symmetry, thus we have trimerization. Excited states cannot be obtained exactly, but we determine a few low-lying ones by using trial states, among them solitons.
PACS: 75.10.Jm – Quantized spin models
© EDP Sciences, 2000