The symmetric and antisymmetric superexchange interactions in spin-Peierls system |
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Authors: | Liu Hai-Lian Wang Zhi-Guo Yang Cheng-Quan Huang Xian-Shan and Shi Yun-Long |
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Affiliation: | Institute of Solid State Physics, Shanxi Datong University, Datong 037009, China; School of Mathematics and Physics, Anhui University of Technology, Maanshan 243002, China; Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China |
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Abstract: | 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. |
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Keywords: | dimerization Dzyaloshinskii--Moriya interaction Kaplan--Shekhtman--Entinwohlman- Aharony interaction |
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