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arXiv:1405.2692 · Journal of High Energy Physics

Exact spectrum of the spin-s Heisenberg chain with generic non-diagonal boundaries

Junpeng Cao, Shuai Cui, Wen‐Li Yang, Kangjie Shi, Yupeng Wang

Published Feb 1, 2015• 20 citations
arXivHTMLPDF

Abstract

The off-diagonal Bethe ansatz method is generalized to the high spin integrable systems associated with the su(2) algebra by employing the spin-s isotropic Heisenberg chain model with generic integrable boundaries as an example. With the fusion techniques, certain closed operator identities for constructing the functional T − Q relations and the Bethe ansatz equations are derived. It is found that a variety of inhomogeneous T − Q relations obeying the operator product identities can be constructed. Numerical results for two-site s = 1 case indicate that an arbitrary choice of the derived T − Q relations is enough to give the complete spectrum of the transfer matrix.

DOI
10.1007/jhep02(2015)036

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