Integrable anisotropic spin-ladder model
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We present an integrable spin-ladder model, which possesses a free parameter besides the rung coupling J. Wang's system based on the SU(4) symmetry can be obtained as a special case. The model is exactly solvable by means of the Bethe ansatz method. We determine the dependence on the anisotropy parameter of the phase transition between gapped and gapless spin excitations and present the phase diagram. Finally, we show that the model is a special case of a more general Hamiltonian with three free parameters.
How to cite this document
Tonel, Arlei Prestes et al. Integrable anisotropic spin-ladder model. Physical Review B - Condensed Matter and Materials Physics, v. 64, n. 5, p. 0544201-0544205, 2001. Available at: <http://hdl.handle.net/11449/224221>.