中国物理B ›› 2007, Vol. 16 ›› Issue (12): 3858-3862.doi: 10.1088/1009-1963/16/12/051
杨成全1, 石云龙2, 刘海莲3, 王治国4, 黄仙山5
Liu Hai-Lian(刘海莲)a)b), Wang Zhi-Guo(王治国)c), Yang Cheng-Quan(杨成全)a), Huang Xian-Shan(黄仙山)b), and Shi Yun-Long(石云龙)a)c)†
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.
中图分类号: (Exchange and superexchange interactions)