Otro
Integrable anisotropic spin-ladder model
Registro en:
Physical Review B. College Pk: American Physical Soc, v. 64, n. 5, 5 p., 2001.
0163-1829
10.1103/PhysRevB.64.054420
WOS:000170267000056
WOS000170267000056.pdf
Autor
Tonel, A. P.
Foerster, A.
Links, J.
Malvezzi, André Luiz
Resumen
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.