Title: Off-diagonal Bethe ansatz for exactly solvable models

Speaker: Prof.Wen-Li Yang (Northwest University)

Time: 3:30PM, Apr.28th (Thursday)

Place: Theoretical Physics Division，319

Abstract: Exactly solvable models have provided some important benchmarks for the non-perturbative analysis of quantum systems. However, it has been well known for many years that there exists class of integrable models, which do not possess U(1)-symmetry and thus make the conventional Bethe ansatz methods almost inapplicable. Recently a systematic method for solving integrable models without U(1)-symmetry, i.e., the off-diagonal Bethe ansatz (ODBA) method was proposed by Cao et al. In this talk, we use the method to solve various typical U(1)-broken quantum spin chains with general integrable boundary condition.