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Entanglement in One-Dimensional Random XY Spin Chain with Dzyaloshinskii--Moriya Interaction |
| SHAN Chuan-Jia;CHENG Wei-Wen;LIU Tang-Kun;HUANG Yan-Xia;LI Hong |
| Department of Physics, Hubei Normal University, Huangshi 435002 |
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| Cite this article: |
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SHAN Chuan-Jia, CHENG Wei-Wen, LIU Tang-Kun et al 2008 Chin. Phys. Lett. 25 817-820 |
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Abstract The impurities of exchange couplings, external magnetic fields and Dzyaloshinskii--Moriya (DM) interaction considered as Gaussian distribution, and the entanglement in one-dimensional random XY spin systems is investigated by the method of solving the different spin--spin correlation functions and the average magnetization per spin. The entanglement dynamics at central locations of ferromagnetic and antiferromagnetic chains have been studied by varying the three impurities and the strength of DM
interaction. (i) For the ferromagnetic spin chain, the weak DM interaction can improve the amount of entanglement to a large value, and the impurities have the opposite effect on the entanglement below and above critical DM interaction. (ii) For the antiferromagnetic spin chain, DM interaction can enhance the entanglement to a steady value. Our results imply that DM interaction strength, the impurity and exchange couplings (or magnetic field) play competing roles in enhancing quantum entanglement.
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| Keywords:
03.65.Ud
03.67.Mn
75.10.Pq
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Received: 01 November 2007
Published: 27 February 2008
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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75.10.Pq
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(Spin chain models)
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