具有对称和反对称超交换相互作用的一维spin-Peierls系统的基态行为

采用Lanczos数值计算方法研究了具有Dzyaloshinskii-Moriya（DM）相互作用和Kaplan-She khtman-Entin-Wohlman-Aharony（KSEA）相互作用的一维spin-Peierls（s-P）系统的基态 行为.计算结果发现KSEA相互作用总是不利于系统二聚化，并且它还影响DM相互作用对系统 二聚化的贡献，甚至可以抵消其作用；在某些特定条件下, KSEA和DM的共同作用可以破坏系 统的二聚化基态而转化为均匀基态. 关键词： DM相互作用 KSEA相互作用 二聚化

Ground state properties of the one-dimensional spin-Peilers model with symmetric and antisymmetric superexchange interactions

Ground-state properties of the one-dimensional spin-Peilers model with Dzyaloshinskii-Moriya(DM)interaction and Kaplan-Shekhtman-Entin-Wohlman-Aharony(KSEA) interactions are studied by Lanczos numerical method. It is shown that the DM interaction acts against dimerization when the DM interaction is irrelative to dimerization. On the other hand, the DM interaction is favorable for dimerization when DM interaction depends on the dimerization. Otherwise, the KSEA interaction is always against dimerization. The KSEA interaction affects the contribution of the DM interaction to dimerization, and even offsets the effect of DM interaction. The dimerization vanishes when DM and KSEA interactions are large enough in some special cases.