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An Exactly Solvable Model of Generalized Spin Ladder

S. Albeverio·S. M. Fei·Y. P. Wang
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Abstract

A detailed study of an $S={1\over2}$ spin ladder model is given. The ladder consists of plaquettes formed by nearest neighbor rungs with all possible SU(2)-invariant interactions. For properly chosen coupling constants, the model is shown to be integrable in the sense that the quantum Yang-Baxter equation holds and one has an infinite number of conserved quantities. The R-matrix and L-operator associated with the model Hamiltonian are given in a limiting case. It is shown that after a simple transformation, the model can be solved via a Bethe ansatz. The phase diagram of the ground state is exactly derived using the Bethe ansatz equation.

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S. Albeverio, S. M. Fei, Y. P. Wang. 1999-08-18. An Exactly Solvable Model of Generalized Spin Ladder. https://doi.org/10.1209/epl%2Fi1999-00397-8

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