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Journal Article

Vertex models and spin chains in formulas and pictures


Razumov,  Alexander V.
Max Planck Institute for Mathematics, Max Planck Society;

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Nirov, K. S., & Razumov, A. V. (2019). Vertex models and spin chains in formulas and pictures. Symmetry, Integrability and Geometry: Methods and Applications, 15: 068. doi:10.3842/SIGMA.2019.068.

Cite as: https://hdl.handle.net/21.11116/0000-0005-1CC7-C
We systematise and develop a graphical approach to the investigations of quantum integrable vertex statistical models and the corresponding quantum spin chains. The graphical forms of the unitarity and various crossing relations are introduced. Their explicit analytical forms for the case of integrable systems associated with the quantum loop algebra ${\mathrm U}_q(\mathcal L(\mathfrak{sl}_{l + 1}))$ are given. The commutativity conditions for the transfer operators of lattices with a boundary are derived by the graphical method. Our consideration reveals useful advantages of the graphical approach for certain problems in the theory of quantum integrable systems.