The Critical Properties of a Modulated Quantum sine—Gordon Model  

作　　者：WANGZhi－Guo ZHANGYu－Mei 

机构地区：[1]DepartmentofPhysics,TongjiUniversity,Shanghai200092,China

出　　处：《Communications in Theoretical Physics》2002年第3期353-358,共6页理论物理通讯（英文版）

摘　　要：A new procedure of trial variational wave functional is proposed for investigating the mass renormalization and the local structure of the ground state of a one-dimensional quantum sine-Gordon model with linear spatial modulation, whose ground state differs from that without modulation. The phase diagram obtained in parameters plane shows that the vertical part of the boundary between soliton lattice phase and incommensurate (IC) phase with vanishing gap sticks at , the IC phase can only appear for and the IC phase regime is enlarged with increasing spatial modulation in the case of definite parameter . The transition is of the continuous type on the vertical part of the boundary, while it is of the first order on the boundary for .

关 键 词：sine-Cordon model spatial modulation soliton lattice incommensurate phase phase diagram 

分 类 号：O413.1[理学—理论物理]