链间超交换相互作用下spin-Peierls梯子模型的基态行为

Ground state properties of spin-Peierls ladder model with interchain superexchange interactions

采用Lanczos数值计算方法研究了具有链间海森堡相互作用和链间Dzyaloshinskii-Moriya(DM)相互作用spin-Peierls梯子模型的基态行为.分析了链间海森堡相互作用和链间DM相互作用对系统二聚化的影响.结果发现,这两种链间作用都不利于系统的二聚化,会造成系统基态二聚化的减小,这说明随着系统维度的增大,系统的各向相互作用会限制系统的二聚化,甚至会破坏系统的二聚化相.

The ground-state properties of spin-Peierls ladder model with interchain Heisenberg interaction and interchain Dzyaloshinskii-Moriya（DM） interaction are studied by Lanczos numerical method. We mainly concentrate on the influence of interchain Heisenberg interaction and interchain DM interaction on system dimerization. The results show that these two interchain interations always act against the dimerization of the system, and they can make system ground state dimerization diminishing, which means that increasing the system dimensions may reduce system dimerization, even destroy the dimerization phase.