外磁场下具有Dzyaloshinski-Moriya作用的海森堡链中的热纠缠(英文)  

Thermal entanglement in Heisenberg chain with Dzyaloshinski-Moriya interaction in external magnetic fields

作　　者：黄利元 方卯发[2] HUANG Liyuan1, FANG Maofa2(1 School of Information Science and Technology, Xiamen University Tan Kah Kee College Zhangzhou 363105, China; 2 College of Physics and Information Science, Hunan Normal University, Changsha 410081, Chin)

机构地区：[1]厦门大学嘉庚学院信息科学与技术学院,福建漳州363105 [2]湖南师范大学物理与信息科学学院,湖南长沙410081

出　　处：《量子电子学报》2018年第4期444-450,共7页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金,11374096

摘　　要：详细分析了DM相互作用常数D、温度T、均匀磁场B、非均匀磁场b、自旋耦合常数J和各向异性参数△对热纠缠度C的影响.结果表明:虽然T和B升高使纠缠度C变小,但D增大使C变大,而且它会使磁场阈值|B_t|变大。当B>|B_t|和B<|B_t|时,6对C的影响不同。对比发现,B和b对于J、△(J△>0)区域纠缠存在的面积变化的影响以及C的影响也不同。另外,当T升高时,B和b存在热纠缠范围的变化规律也不尽相同。因此,即使在强外磁场及高温环境等恶劣条件下,也可以通过调节B、b、J、D、T和△来控制热纠缠.这些结论在固态系统量子信息研究中有一定应用价值。Influences of the Dzyaloshinskii-Moriya（DM） coupling constant D, temperature T, uniform external magnetic field B, nonuniform magnetic field b, real coupling constant J and anisotropic parameter△ on the thermal entanglement concurrence C are investigated in detail. Results show that both the increasing of T and ｜B｜ decrease C, but the increasing of D develops C, and D can also heighten the magnetic field threshold ｜B_t｜. When B is bigger or less than ｜B_t｜, b has different influence on C. By comparison, it is found that the B and b have different effects on the area about J and △（JA 〉 0） where exists thermal entanglement as well as on C. What’s more, as T increases, the variation rule of the range of B in which exists thermal entanglement is different from b. As a result, the thermal entanglement can be controlled by adjusting the values of B, b, J, D, T and △ in various terrible environments, such as strong external magnetic field, or high temperature environment, which is useful in the research of quantum information in solid systems.

关 键 词：量子光学 热纠缠 并发度 海森堡XXZ链 DM相互作用 非均匀磁场 

分 类 号：O431.2[机械工程—光学工程]