Exact solution of a topological spin ring with an impurity

作     者：Xu-Chu Huang Yi-Hua Song Yi Sun 黄旭初;宋艺华;孙毅

作者机构：Department of PhysicsChangji UniversityChangji 830011China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2020年第29卷第6期

页      面：473-478页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China(Grant No.11664001) 

主　　题：Bethe ansatz impurity topological spin ring 

摘      要：The spin-1/2 Heisenberg chain coupled to a spin-S impurity moment with anti-periodic boundary condition is studied via the off-diagonal Bethe ansatz *** twisted boundary breaks the U(1)symmetry of the system,which leads to that the spin ring with impurity can not be solved by the conventional Bethe ansatz *** combining the properties of the R-matrix,the transfer matrix,and the quantum determinant,we derive the T–Q relation and the corresponding Bethe ansatz *** residual magnetizations of the ground states and the impurity specific heat are *** is found that the residual magnetizations in this model strongly depend on the constraint of the topological boundary condition,the inhomogeneity of the impurity comparing with the hosts could depress the impurity specific heat in the thermodynamic *** method can be expand to other integrable impurity models without U(1)symmetry.