Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction
Qin Meng(秦猛)a), Xu Sheng-Long(徐胜龙)b), Tao Ying-Juan(陶应娟)a), and Tian Dong-Ping(田东平)c)†
aSchool of Science, Xi'an Jiaotong University, Xi'an 710049, China; bCollege of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China; c Xi'an Institute of Post and Telecommunication, Xi'an 710061, China
Abstract This paper investigates thermal entanglements of a two-qubit Heisenberg $XY$ chain in the presence of the Dzyaloshinskii--Moriya anisotropic antisymmetric interaction. By the concept of concurrence, it is found that the effects of spin--orbit coupling on the entanglement are different from those of spin--spin model. The analytical expressions of concurrence are obtained for this model.
Received: 29 October 2007
Revised: 26 November 2007
Accepted manuscript online:
(Quantized spin models, including quantum spin frustration)
Cite this article:
Qin Meng(秦猛), Xu Sheng-Long(徐胜龙), Tao Ying-Juan(陶应娟), and Tian Dong-Ping(田东平) Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction 2008 Chin. Phys. B 17 2800
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