Exact surface energy of the isotropic spin-1 Heisenberg chain with generic non-diagonal boundary

Jiasheng Dong, Pengcheng Lu, Junpeng Cao, Wen-Li Yang, Ian Marquette, Yao-Zhong Zhang

Published 2024-01-06Version 1

We investigate the thermodynamic limit and exact surface energy of the isotropic spin-1 Heisenberg chain with generic boundary by a novel Bethe ansatz method. We obtain the homogeneous zero points Bethe ansatz equations and the corresponding patterns of zero points. Based on these patterns and the constraints between the zero points, we calculate the densities of zero points and the exact surface energies of the model in all regimes of the boundary parameters.