有限集团近似研究二维和三维晶格横场伊辛模型的热力学性质  

FINITE CLUSTER APPROXIMATION STUDY OF TWO AND THREE DIMENSIONAL LATTICE THERMODYNAMICAL PROPERTIES OF THE TRANSVERSE ISING MODEL

作　　者：晏世雷[1] 杨传章[1] 

机构地区：[1]苏州大学物理科学与技术学院

出　　处：《苏州大学学报（自然科学版）》1996年第1期46-49,共4页Journal of Soochow University(Natural Science Edition)

摘　　要：本文在有限集团近似的框架内研究了自旋为1/2的二维平方晶格和三维简立方晶格横场伊辛模型的热力学性质,得到了相应的相图,临界温度和临界横场。有限集田近似方法与平均场近似相比,在数学上处理同样简单,但可给出更好的结果。The thermodynamical properties of the two dimensional square lattice and the three dimensional simple cubic lattice transverse Ising model with spin - 1/2 are investigated within the framework of the finite cluster appraximation. The phase diagram, the critical temperature and the critical transverse field are obtained. The finite cluster approximation method is conceptually as simple as an ordinary mean field approximation, but gives much better results.

关 键 词：平方晶格 有限集团 横场 伊辛模型 晶格 热力学 

分 类 号：O481.2[理学—固体物理]