Integrable S=1/2 Quantum Spin Chains with Short-Range Exchange
The ID lattice spin chains, being the simplest quantum many-body systems, are still considered as objects for intensive study due to their relations to more realistic models in quantum statistics. As a rule, even for these systems the spectral problem is overcomplicated. The rare cases of its reduction are associated with the quantum integrability. Most of them concern the famous situation of nearest- neighbor or “local” interaction considered first by Bethe  and have the solution in the form of the Bethe ansatz [1–4].
Unable to display preview. Download preview PDF.