| Entanglement in One-Dimensional Random XY Spin Chain with Dzyaloshinskii-Moriya Interaction |
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| 作者姓名： | 单传家 程维文 刘堂昆 黄燕霞 李宏 |
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| 作者单位： | Department of Physics, Hubei Normal University, Huangshi 435002 |
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| 基金项目： | Supported by the Key Higher Education Programme of Hubei Province under Grant No Z20052201, the Natural Science Foundation of Hubei Province, China under Grant No 2006ABA055, and the Postgraduate Programme of Hubei Normal University under Grant No 2007D20. |
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| 摘 要： | 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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| 关 键 词： | 缠结 空间随机实验 相互关系 物理学 |
| 收稿时间： | 2007-11-01 |
Entanglement in One-Dimensional Random XY Spin Chain with Dzyaloshinskii--Moriya Interaction |
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| SHAN Chuan-Jia,CHENG Wei-Wen,LIU Tang-Kun,HUANG Yan-Xia,LI Hong.Entanglement in One-Dimensional Random XY Spin Chain with Dzyaloshinskii-Moriya Interaction[J].Chinese Physics Letters,2008,25(3):817-820. |
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| Authors: | SHAN Chuan-Jia CHENG Wei-Wen LIU Tang-Kun HUANG Yan-Xia LI Hong |
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| Institution: | Department of Physics, Hubei Normal University, Huangshi 435002 |
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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 DMinteraction. (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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