The symmetric and antisymmetric superexchange interactions in spin-Peierls system  

作　　者：刘海莲 王治国 杨成全 黄仙山 石云龙 

机构地区：[1]Institute of Solid State Physics, Shanxi Datong University, Datong 037009, China [2]School of Mathematics and Physics, Anhui University of Technology, Maanshan 243002, China [3]Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China

出　　处：《Chinese Physics B》2007年第12期3858-3862,共5页中国物理B（英文版）

摘　　要：The influences of Dzyaloshinskii Moriya （DM） interaction and Kaplan-Shekhtman-Entinwohlman-Aharony （KSEA） interaction on the dimerization of a spin-Peierls system are investigated theoretically by using the Lanczos numerical method. The ground state of the spin-Peierls system is still dimerized phase when both of the DM and the KSEA interactions have the same value with Heisenberg interaction. It is found that the KSEA interaction and uniform DM interaction are always against systemic dimerization, but the staggered DM interaction acts in favour of dimerization. Furthermore, the influences of the DM and the KSEA interactions are also studied in terms of the ground state index rate and the energy gap index rate of the dimerized Heisenberg system. The results show that the DM interaction makes the index rates larger, while the KSEA interaction makes them smaller.The influences of Dzyaloshinskii Moriya （DM） interaction and Kaplan-Shekhtman-Entinwohlman-Aharony （KSEA） interaction on the dimerization of a spin-Peierls system are investigated theoretically by using the Lanczos numerical method. The ground state of the spin-Peierls system is still dimerized phase when both of the DM and the KSEA interactions have the same value with Heisenberg interaction. It is found that the KSEA interaction and uniform DM interaction are always against systemic dimerization, but the staggered DM interaction acts in favour of dimerization. Furthermore, the influences of the DM and the KSEA interactions are also studied in terms of the ground state index rate and the energy gap index rate of the dimerized Heisenberg system. The results show that the DM interaction makes the index rates larger, while the KSEA interaction makes them smaller.

关 键 词：DIMERIZATION Dzyaloshinskii-Moriya interaction Kaplan-Shekhtman Entinwohlman- Aharony interaction 

分 类 号：O62[理学—有机化学]