Solution of a two-leg spin ladder system

Authors
Links, J Foerster, A
Citation
J. Links et A. Foerster, Solution of a two-leg spin ladder system, PHYS REV B, 62(1), 2000, pp. 65-68
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
1
Year of publication
2000
Pages
65 - 68
Database
ISI
SICI code
0163-1829(20000701)62:1<65:SOATSL>2.0.ZU;2-H
Abstract
A model for a spin-1/2 ladder system with two legs is introduced. It is dem onstrated that this model is solvable via the Bethe ansatz method for arbit rary values of the rung coupling J. This is achieved by a suitable mapping from the Hubbard model with appropriate twisted boundary conditions. We det ermine that a phase transition between gapped and gapless spin excitations occurs at the critical value J(c) = 1/2 of the rung coupling.