简谐外磁场环境下海森堡XXZ模型的热力学纠缠  

Thermal Entanglement of Heisenberg XXZ Model in the Simple Harmonic Magnetic Field

作　　者：谭德宏[1] 王凯俊[1] 杨玉梅[1] 颜华[1] 刘力[1] 

机构地区：[1]后勤工程学院基础部,重庆401311

出　　处：《后勤工程学院学报》2012年第1期82-85,96,共5页Journal of Logistical Engineering University

摘　　要：研究了在简谐外磁场环境下的海森堡XXZ模型,并通过计算解出热力学纠缠度。模拟表明,取不同的各向异性参数时,系统的热力学纠缠度对外部磁场和环境温度的变化比较敏感,并随简谐磁场的变化表现出周期性。固定各向异性参数时,热纠缠度随温度的增加呈现衰减趋势;增大各向异性参数时,热纠缠度则很快地趋于零,其对应临界温度也迅速降低。The Heisenberg XXZ model in simple harmonic magnetic field environment is studied, and the expression of thermal entanglement is obtained by calculating. The simulation results of thermal entanglements show that the thermal entanglements are sensitive to the external magnetic and environment temperature with the different anisotropy parameters being given, and show periodicity with the change of simple harmonic external magnetic field;the thermal entanglement has the trend of attenuation with the increase of temperature when anisotropy parameter is fixed ; meanwhile, it inclines to zero so rapidly with increase of anisotropy parameter that its critical temperature reduces quickly.

关 键 词：XXZ模型 简谐磁场 热力学纠缠 临界温度 

分 类 号：O431[机械工程—光学工程]