D-M相互作用对Spin-Peierls系统二聚化的影响  

The influence of dzyaloshinskii-moriya interaction on the dimerization in Spin-Peierls systems

作　　者：杨治国[1] 王治国[1] 

机构地区：[1]同济大学物理系,上海200092

出　　处：《商丘师范学院学报》2002年第2期16-18,共3页Journal of Shangqiu Normal University

摘　　要：利用Lanczos数值计算方法研究了Spin-Peierls系统中D-M相互作用对于二聚化的影响.得到的结论表明:当D-M相互作用与晶格畸变无关时,它的作用将抑止二聚化;当D-M相互作用是格点交错时,它可能会有利于二聚化.随着交错系数的逐渐变大,D-M相互作用从抑止二聚化变为增强二聚化,最后给出了交错系数的临界值.By Lanczos numerical method. The influence of Dzyaloshinskii-Moriya(D-M) interaction on the dimer-ization in Spin-Peierls systems is studied. The ground sate of the Spin-Peierls system is still a dimerized phase when D-M interaction is present. The results show that the uniform D-M interaction is always against dimeriza-tion but the staggered D-M interaction may act in favour of or against dimerization. There exists a critical point where the staggered D-M interaction has no influence on dimerization.

关 键 词：D-M相互作用 SPIN-PEIERLS系统 二聚化 LANCZOS方法 

分 类 号：O412.3[理学—理论物理] O413.3[理学—物理]