Spin chirality driven by the Dzyaloshinskii–Moriya interaction in one-dimensional antiferromagnetic chain

Author:

Guo Xing1ORCID,Li Yaojin2ORCID,Yao Zimeng1ORCID,Jia Chenglong3ORCID,Zhang Lan4

Affiliation:

1. School of Mechanical and Materials Engineering, Xi’an University 1 , Xi’an 710065, People’s Republic of China

2. School of Electronic and Information Engineering, Xi’an Jiaotong University 2 , Xi’an 710049, People’s Republic of China

3. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University 3 , Lanzhou 730000, People’s Republic of China

4. Department of Physics, Tianshui Normal University 4 , Tianshui 741001, People’s Republic of China

Abstract

Dzyaloshinskii–Moriya (DM) interactions cause many interesting physical features, such as topologically nontrivial magnetic skyrmions and chiral domain walls. These interactions become more pronounced in low-dimensional systems. We investigated a one-dimensional Heisenberg spin-1/2 chain with an asymmetric DM interaction. The results show that, upon applying a nonzero DM interaction, the Néel ground state transitions to a spin chiral phase. Moreover, using the mean-field approximation, we obtain the dispersion of the energy spectrum, from which the z-axis spin chirality is calculated as a function of the strength of the DM interaction for low-lying excitations. The results indicate that the DM interaction facilitates chirality for Dz ≤ J and induces a spin-gapped chiral state.

Funder

Natural Science Basic Research Program of Shaanxi Province

Natural Science Foundation of Shaanxi Provincial Department of Education

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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