MPS overlaps and Sklyanin determinants

Abstract

We derive explicit overlap functions for integrable matrix product states associated with arbitrary finite-dimensional irreducible evaluation representations of the orthogonal and symplectic twisted Yangians. The central step is to relate the commuting quasi-determinants entering the universal overlap formula to Sklyanin determinants of nested subalgebras. For orthogonal evaluation representations, this relation determines their spectra directly in the Gelfand--Tsetlin basis. In the symplectic case, we combine Sklyanin determinants and minors with a factorization of the nested rank-two boundary matrices to obtain the corresponding spectra. The resulting overlap functions are explicit products parametrized by Gelfand--Tsetlin patterns and require only the highest-weight data of the underlying orthogonal or symplectic representation. Together with the universal ratio of Gaudin determinants and the model-dependent pseudovacuum overlap coefficients, they determine the normalized MPS overlaps. We also express the overlap functions in the orthogonal case beyond evaluation representations in terms of the highest weights arising along the nested twisted-Yangian subalgebras.