The spin- XXZ torus is characterized by the Hamiltonian. Due to the twisted boundary condition, the U 1 -symmetry is broken, making it very different from the periodic XXZ chain. For examples, because the inhomogeneous BAEs can reduce to the conventional ones when the model parameters taking some special values, then one can use the results at the degenerate points to get the actual values [ 20 ]. Thus the Bethe roots form a single string [ 15 ]. In this case, the Ising-like spin coupling in Hamiltonian 2. By means of the separation of variables, the BA-like equations and form factors are obtained [ 4 ]. In the case of , the model degenerates to a Ising-like model.
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