Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2004-11-15
Nonlinear Sciences
Exactly Solvable and Integrable Systems
62 pages
Scientific paper
10.1016/j.nuclphysb.2004.12.008
We consider the algebraic Bethe ansatz solution of the integrable and isotropic XXX-S Heisenberg chain with non-diagonal open boundaries. We show that the corresponding K-matrices are similar to diagonal matrices with the help of suitable transformations independent of the spectral parameter. When the boundary parameters satisfy certain constraints we are able to formulate the diagonalization of the associated double-row transfer matrix by means of the quantum inverse scattering method. This allows us to derive explicit expressions for the eigenvalues and the corresponding Bethe ansatz equations. We also present evidences that the eigenvectors can be build up in terms of multiparticle states for arbitrary S.
Martins Marcio J.
Melo C. S.
Ribeiro G. A. P.
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