两粒子自旋系统中的热纠缠研究  

Investigation of thermal entanglement in a two - particles spin chain

作　　者：赵中伦[1] 秦猛[2] 李延标[2] 

机构地区：[1]解放军理工大学气象海洋学院,江苏南京211101 [2]解放军理工大学理学院,江苏南京211101

出　　处：《大学物理》2013年第10期55-58,共4页College Physics

基　　金：解放军理工大学预研基金资助课题

摘　　要：采用纠缠的度量方法负性(Negativity)研究了自旋为1的两粒子海森伯XXZ链的纠缠特性.研究发现纠缠并非只会随Dzialoshinskii-Moriya(DM)相互作用的增加而增大,纠缠消失时的临界温度T C会因各项异性参数J z和DM相互作用的不同而不同.较大的J z能使得z方向DM相互作用的临界磁场增加.可以通过调节DM相互作用的方向、各项异性参数J z和磁场B来控制和生成纠缠.The entanglement of two-particles Heisenberg XXZ chains with different Dzyaloshinskii-Moriya（DM） interaction is investigated.By means of negativity,the entanglement is calculated in detail as a function of the different parameter.We find that the entanglement will not be always enhanced by the increase of DM interaction.The critical temperature when entanglement disappeared varies with the different parameters J z and DM interaction.The entanglement as a function of magnetic field shows different properties for different x or z-component DM interaciton.Moreover,the entanglement can be controlled and enhanced by varying the distributions of the impurities,the strength of external magnetic field and the DM interaction.

关 键 词：纠缠 海森伯链 Dzialoshinskii-Moriya相互作用 

分 类 号：O413.1[理学—理论物理]