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Chin. Phys. B, 2020, Vol. 29(6): 067501    DOI: 10.1088/1674-1056/ab8886
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Exact solution of a topological spin ring with an impurity

Xu-Chu Huang(黄旭初), Yi-Hua Song(宋艺华), Yi Sun(孙毅)
Department of Physics, Changji University, Changji 830011, China
Abstract  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 method. The 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 methods. By 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 equations. The residual magnetizations of the ground states and the impurity specific heat are investigated. It 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 limit. This method can be expand to other integrable impurity models without U(1) symmetry.
Keywords:  Bethe ansatz      impurity      topological spin ring  
Received:  26 October 2019      Revised:  17 March 2020      Published:  05 June 2020
PACS:  75.30.Hx (Magnetic impurity interactions)  
  02.30.Ik (Integrable systems)  
  72.10.Fk (Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11664001).
Corresponding Authors:  Yi-Hua Song     E-mail:  y.quantumage@163.com

Cite this article: 

Xu-Chu Huang(黄旭初), Yi-Hua Song(宋艺华), Yi Sun(孙毅) Exact solution of a topological spin ring with an impurity 2020 Chin. Phys. B 29 067501

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