Thermal entanglement in the Heisenberg XXZ model with Dzyaloshinskii¨CMoriya interaction

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• 作者：Sha-Sha  ; Li^a ; Ting-Qi  ; Ren^a ;   ; ^{rtq@mail.qfnu.edu.cn} ; Xiang-Mu  ; Kong^a ;   ; ^{xmkong6317@yahoo.com.cn} ; Kai  ; Liu^b
• 关键词：Entanglement ; Negativity ; Heisenberg XXZ model ; DM interaction
• 刊名：Physica A
• 出版年：2012
• 出版时间：1 January 2012
• 年：2012
• 卷：391
• 期：1-2
• 页码：35-41
• 全文大小：453 K

文摘

By the concept of negativity, we investigate the thermal entanglement in the two-spin Heisenberg XXX and XXZ models in the presence of Dzyaloshinskii¨CMoriya interactions respectively. Through calculation, we know that for the XXZ model, the and can be used together to control the extent of entanglement and, in particular, to obtain large entanglement. The effect of spin in both models shows that it can increase the critical temperature and the negativity decreases as the spin increases. We found that the DM interaction has different effects on Fermi and Bose systems so it can not only excite entanglement but also affect the entanglement in different spin systems.