Exactly solvable quantum spin tubes and ladders
arXiv:cond-mat/9907134 · doi:10.1088/0305-4470/32/33/102
Abstract
We find families of integrable n-leg spin-1/2 ladders and tubes with general isotropic exchange interactions between spins. These models are equivalent to su(N) spin chains with N=2^n. Arbitrary rung interactions in the spin tubes and ladders induce chemical potentials in the equivalent spin chains. The potentials are n-dependent and differ for the tube and ladder models. The models are solvable by means of nested Bethe Ansatz.
6 pages, Latex, 1 eps fig, to appear in J. Phys. A