On the second reference state and complete eigenstates of the open XXZ chain
Yang, Wen-Li and Zhang, Yao-Zhong (2007) On the second reference state and complete eigenstates of the open XXZ chain. The Journal of High Energy Physics, 20074: 044-1-044-10. doi:10.1088/1126-6708/2007/04/044
The second reference state of the open XXZ spin chain with non-diagonal boundary terms is studied. The associated Bethe states exactly yield the second set of eigenvalues proposed recently by functional Bethe Ansatz. In the quasi-classical limit, two sets of Bethe states give the complete eigenstates of the associated Gaudin model.