Infinite-dimensional symmetry of exactly solvable models and various physical applications in the finite-size quantum many-body systems

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Applying the infinite-dimensional symmetries of quantum integrable systems, we derive exactly various interesting physical properties of large but finite-size quantum integrable systems. For instance, through the sl (2) loop algebra, which is an infinite-dimensional Lie algebra appearing in the XXZ spn chain when q is a root of unity, we classify the Hilbert space of the super-integrable chiral Potts model and derive the eigenvectors, explicitly. Making use of the asymmetric R-matrix of the XXZ spin chain, we derived the multiple-integral representations of arbitrary correlation functions.