具有反对称超交换相互作用的一维开链spin-Peierls系统的基态行为

Ground state properties of the one-dimensional unperiod spin-Peierls model with antisymmetric superexchange interaction

采用Lanczos数值计算方法研究了具有Dzyaloshinskii-Moriya(DM)相互作用的一维开链spin-Peierls(s-P)系统的基态行为.首先验证了闭链条件下DM相互作用对系统二聚化的影响是和DM相互作用对二聚化畸变依赖程度有关.接着计算了开链条件下DM相互作用对晶格畸变不同依赖程度时,对系统二聚化的影响,发现DM相互作用在某一个特殊的点处,对系统的二聚化都没有影响,并且在这个特殊的点两边呈现出不同的变化趋势.

Ground state properties of the one-dimensional unperiod spin-Peilers model with Dzyaloshinskii-Moriya （DM） interaction are studied by Lancaos numerical method. It is shown that the DM interaction acts against dimerization when the DM interaction is irrelative with dimerization in period. On the other hand, the DM interaction is favor for dimerization when DM interaction depends on the dimerization in period. Otherwise, We also study the influence of DM interaction on system dimerization in unperiod when DM interaction depend on crystal lattice aberration in different degree, And we found that DM interaction has no influence on system dimerization in a special value δc, At the same time, the value in both side of the δc vary by different trend.