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Acta Physica Sinica

Ground state properties of the one-dimensional spin-Peilers model with symmetric and antisymmetric superexchange interactions

Hailian Liu, Zhiguo Wang, Chen Yu-Guang, Shi Yun-Long, Chen Hong, (1)同济大学波耳固体物理研究所，上海 200092; (2)同济大学波耳固体物理研究所，上海 200092;雁北师范学院物理系，大同 037000

Published Jan 1, 2005• 5 citations
Publisher

Abstract

Ground-state properties of the one-dimensional spin-Peilers model with Dzyaloshi nskii-Moriya（DM）interaction and Kaplan-Shekhtman-Entin-Wohlman-Aharony（KSEA） interactions are studied by Lanczos numerical method. It is shown that the DM interaction acts against dimerization when the DM interaction is irrelative to dimerization. On the other hand, the DM interaction is favorable for dimerization when DM interaction depends on the dimerization. Otherwise, the KSEA interactio n is always against dimerization. The KSEA interaction affects the contribution of the DM interaction to dimerization, and even offsets the effect of DM interac tion. The dimerization vanishes when DM and KSEA interactions are large enough i n some special cases.

DOI
10.7498/aps.54.2329

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Journal of Shanxi Datong University•Jan 1, 2010•0 citations
Ground-state properties of the one-dimensional spin-Peilers model with Dzyaloshi nskii-Moriya（DM）interaction and Kaplan-Shekhtman-Entin-Wohlman-Aharony（KSEA） interactions are studied by Lanczos numerical method. It is shown that the DM interaction acts against dimerization when the DM interaction is irrelative to dimerization. On the other hand, the DM interaction is favorable for dimerization when DM interaction depends on the dimerization. Otherwise, the KSEA interactio n is always against dimerization. The KSEA interaction affects the contribution of the DM interaction to dimerization, and even offsets the effect of DM interac tion. The dimerization vanishes when DM and KSEA interactions are large enough i n some special cases.
The effects of the Dzyaloshinskii—Moriya (DM) and the Kaplan—Shekhtman—Entinwohlman—Aharony (KSEA) superexchange interactions on the ground state properties of the one-dimensional spin-Peilers system in open chain are studied by using the Lanczos numerical method. The study concentrates mainly on the influence of systemic dimerisation in open chain. The results show that systemic ground state energy density varies with dimerisation parameter δ in different DM interactions, and there exists a special point δc where the DM interaction has no influence on the systemic dimerisation, no matter whether the DM interaction is relative or irrelative to systemic dimerisation (η = 1 or η = 0). The KSEA interaction has no fixed special point, but the points of intersection are dense relatively in a certain numberical value range, and sparse in other numberical value ranges. So we can conclude that the antisymmetric anisotropy DM interaction differs from the symmetric anisotropy KSEA interaction, but they are analogous in the sense of the influence of systemic dimerisation in open chain.
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.
Ground state properties of the one-dimensional unperiod spin-Peilers model with Dzyaloshinskii-Moriya(DM)interaction are studied by Lanczos 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 δ_c,At the same time,the value in both side of the δ_c vary by different trend.
We investigate the effects of the Dzialoshinskii-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions on various thermodynamic and magnetic properties of a spin-1/2 ladder. Using the Majorana fermion representation, we derive the spectrum of low energy excitations for a pure DM interaction and in presence of a superimposed KSEA interaction. We calculate the various correlation functions for both cases and discuss how they are modified with respect to the case of an isotropic ladder. We also discuss the electron spin resonance (ESR) spectrum of the system and show that it is strongly influenced by the orientation of the magnetic field with respect to the Dzialoshinskii-Moriya vector. Implications of our calculations for nuclear magnetic resonance and ESR experiments on ladder systems are discussed.
The ground-state properties of spin-Peierls ladder model with interchain Heisenberg interaction and interchain Dzyaloshinskii-Moriya(DM)interaction are studied by Lanczos numerical method. We mainly concentrate on the influence of interchain Heisenberg interaction and interchain DM interaction on system dimerization. The results show that these two interchain interations always act against the dimerization of the system, and they can make system ground state dimerization diminishing, which means that increasing the system dimensions may reduce system dimerization, even destroy the dimerization phase.