Geodesic
Structure of quantum L operators for the R matrix of the XXZ model
Teoretičeskaâ i matematičeskaâ fizika, Tome 61 (1984) no. 2, pp. 163-173 
V. O. Tarasov. Structure of quantum L operators for the R matrix of the XXZ model. Teoretičeskaâ i matematičeskaâ fizika, Tome 61 (1984) no. 2, pp. 163-173. http://geodesic.mathdoc.fr/item/TMF_1984_61_2_a0/
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     author = {V. O. Tarasov},
     title = {Structure of quantum {L} operators for the {R} matrix of the {XXZ} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {163--173},
     year = {1984},
     volume = {61},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_61_2_a0/}
}
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For the R matrices of the XXX and XXZ models, a study is made of the L operators, i.e., the monodromy matrices with vacuum and finite-dimensional single-particle subspace. All possible vacuum eigenvalues of the diagonal matrix elements are found for such monodromy matrices. In the case of the R matrix of the XXZ model, the ratio of the vacuum eigenvalues is shown to be $\pi$-periodic with respect to the spectral parameter. All monodromy matrices with one-dimensional single-particle subspace are found.

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