Ground state and elicitations of a spin chain with orbital degeneracy

Citation
Yq. Li et al., Ground state and elicitations of a spin chain with orbital degeneracy, PHYS REV B, 60(18), 1999, pp. 12781-12787
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
0163-1829 → ACNP
Volume
60
Issue
18
Year of publication
1999
Pages
12781 - 12787
Database
ISI
SICI code
0163-1829(19991101)60:18<12781:GSAEOA>2.0.ZU;2-7
Abstract
The one-dimensional Heisenberg model in the presence of orbital degeneracy is studied at the SU(4) symmetric point by means of Bethe ansatz. Following Sutherland's previous work on an equivalent model, we discuss the ground s tate and the low-lying excitations more extensively in connection to the sp in systems with orbital degeneracy. We show explicitly that the ground stat e is a SU(4) singlet. We study the degeneracies of the elementary excitatio ns and the spectra of the generalized magnons consisting of these excitatio ns. We also discuss the complex 2-strings in the context of the Bethe ansat z solutions. [S0163-1829(99)00238-6].