Exactly solvable quantum spin tubes and ladders

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

References in corpus (3)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Exact solution of a spin-ladder model
• Integrable su(2)-invariant spin chains and the Haldane conjecture

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