Anomalous Magnetization Exponent and Singular Frustration Induced Gap inIncommensurate Massive One-Dimensional Lattice Models  

作　　者：GUBo ZHANGJun 

机构地区：[1]DepartmentofPhysics,PekingUniversity,Beijing100871,China [2]DepartmentofPhysics,XinjiangUniversity,Wurumqi830046,China

出　　处：《Communications in Theoretical Physics》2004年第1X期146-150,共5页理论物理通讯（英文版）

基　　金：国家自然科学基金，the Science Research Foundation of the Education Bureau of Anhui Province of China

摘　　要：This paper investigates the frustration induced phenomena at the commensurate-incommensurate crossing point in one-dimensional massive systems. The massive elementary excitation can be described by a dispersion e(k )=√∑ an cos(nk), with a set of phenomenological coefficients an, which depend on the frustration. From the dispersion,we find that at the commensurate-incommensurate crossing point, both pitch angle and the correlation length have square root singularities, being functions of funstration intensity. The gap in the incommensurate side also comes to be singular while approaching the crossing point. Anomalous magnetization exponent appears at the singular point of the spin gap.

关 键 词：能隙 反常磁化 不对称性 一维系统 异常抑止 对称-不对称截面点 量子系统 

分 类 号：O413[理学—理论物理]