一维受阻挫海森堡自旋-声子链的相变研究  

Phase Transition Study on One-dimensional Frustrated Heisenberg Spin-phonon Chain by DMRG Method

作　　者：陈泽章[1] 补朝阳[2] 

机构地区：[1]新乡学院物理与电子工程学院,河南新乡453003 [2]新乡学院化学化工学院,河南新乡453003

出　　处：《新乡学院学报》2016年第12期15-17,共3页Journal of Xinxiang University

基　　金：新乡学院教育教学改革项目(5144151351)

摘　　要：用密度矩阵重整化群(DMRG)方法,研究一维受阻挫反铁磁海森堡自旋-声子链模型在发生Spin-Peierls(SP)相变时的动力学特性,计算了该系统发生相变时的三重态能隙和动态二聚体基态能量。结果表明:作为目前计算一维强关联系统最有效的数值计算方法,DMRG给出了比以前利用严格对角化方法更精确的数值结果。By using density-matrix renormalization group（DMRG） method, the authors investigate the dynamics characteristic of a system of one-dimensional frustrated antiferromagnet Heisenberg spin-phonon chain occurred spin-Peierls phase. The singlet-triplet gap and the ground state energy of dynamic dimer are calculated. The resuhs show that as one of the most efficient methods in dealing with strongly-coupled physical systems, DMRG has provided us the results with much higher precisions than exact diagonalization methods.

关 键 词：密度矩阵重整化群 相变 阻挫 海森堡链 

分 类 号：O413.1[理学—理论物理]