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Thermal entanglement in a two-qubit Heisenberg XY chain with the Dzyaloshinskii--Moriya interaction |
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| Authors: | Qin Meng Xu Sheng-Long Tao Ying-Juan and Tian Dong-Ping |
| Institution: | College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China; School of Science, Xi'an Jiaotong University, Xi'an 710049, China; 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. |
| Keywords: | thermal entanglement Heisenberg $XY$ chain Dzyaloshinskii--Moriya interaction |
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