Geodesic
Reduction of $XXZ$ Model with Generalized Periodic Boundary Conditions
Teoretičeskaâ i matematičeskaâ fizika, Tome 129 (2001) no. 2, pp. 207-218

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We examine the $XXZ$ model with generalized periodic boundary conditions and identify conditions for the truncation of the functional relations of the transfer-matrix fusion. After the truncation, the fusion relations become a closed system of functional equations. The energy spectrum can be obtained by solving these equations. We obtain the explicit form of the Hamiltonian eigenvalues for the special case where the anisotropy parameter $q^4=-1$. 
@article{TMF_2001_129_2_a2,
     author = {A. A. Belavin and S. Yu. Gubanov},
     title = {Reduction of $XXZ$ {Model} with {Generalized} {Periodic} {Boundary} {Conditions}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {207--218},
     publisher = {mathdoc},
     volume = {129},
     number = {2},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_129_2_a2/}
}
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A. A. Belavin; S. Yu. Gubanov. Reduction of $XXZ$ Model with Generalized Periodic Boundary Conditions. Teoretičeskaâ i matematičeskaâ fizika, Tome 129 (2001) no. 2, pp. 207-218. http://geodesic.mathdoc.fr/item/TMF_2001_129_2_a2/