具有长程相互作用S-1/2 XY链的研究  

Study of the XY chain with long-range interactions

作　　者：李嘉亮[1] 类淑国[2] 

机构地区：[1]常熟理工学院江苏省新型功能材料重点建设实验室 [2]南京工业大学应用物理系,南京210009

出　　处：《物理学报》2008年第9期5944-5950,共7页Acta Physica Sinica

基　　金：江苏省新型功能材料重点建设实验室开放基金(批准号:06KFJJ004)资助的课题~~

摘　　要：采用平均场Jordan-Wigner变换分析方法,研究了外场中且具有Z方向均匀长程相互作用自旋-1/2XY链的热力学性质,得到了系统格点的亥姆赫兹自由能、内能、比热、磁化强度、磁化率等热力学量的解析表达式及其数值解,讨论了系统的一级和两级相变,数值结果在退化条件下与其他文献的结果符合很好.Using the mean-field Jordan-Wigner transformation analysis, we have studied the one-dimensional spin-1/2 XY chain with Z-directional uniform long-range interactions in the external magnetic field. We have obtained such results as the Helmholtz free energy, internal energy, specific heat, magnetization and isothermal susceptibility. We also discuss the first and second-order phase transitions of the system at a finite temperature. Our results agree with results published in literature.

关 键 词：XY链 平均场Jordan-Wigner变换 长程相互作用 

分 类 号：O414.22[理学—理论物理]