Magnon bands in twisted bilayer honeycomb quantum magnets

doi:10.1088/1674-1056/abeee5

中国物理B ›› 2021, Vol. 30 ›› Issue (7): 77505-077505.doi: 10.1088/1674-1056/abeee5

所属专题： SPECIAL TOPIC — Twistronics

Magnon bands in twisted bilayer honeycomb quantum magnets

Xingchuan Zhu(朱兴川)¹, Huaiming Guo(郭怀明)^2,†, and Shiping Feng(冯世平)¹

1 Department of Physics, Beijing Normal University, Beijing 100875, China;
2 Key Laboratory of Micro-Nano Measurement-Manipulation and Physics(Ministry of Education), Department of Physics, Beihang University, Beijing 100191, China

收稿日期:2021-01-21 修回日期:2021-03-10 接受日期:2021-03-16 出版日期:2021-06-22 发布日期:2021-07-02
通讯作者: Huaiming Guo E-mail:hmguo@buaa.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774019, 11974051, and 11734002), the Fundamental Research Funds for the Central Universities and the HPC Resources at Beihang University, and the National Key Research and Development Program of China (Grant No. 2016YFA0300304).

Magnon bands in twisted bilayer honeycomb quantum magnets

Xingchuan Zhu(朱兴川)¹, Huaiming Guo(郭怀明)^2,†, and Shiping Feng(冯世平)¹

1 Department of Physics, Beijing Normal University, Beijing 100875, China;
2 Key Laboratory of Micro-Nano Measurement-Manipulation and Physics(Ministry of Education), Department of Physics, Beihang University, Beijing 100191, China

Received:2021-01-21 Revised:2021-03-10 Accepted:2021-03-16 Online:2021-06-22 Published:2021-07-02
Contact: Huaiming Guo E-mail:hmguo@buaa.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774019, 11974051, and 11734002), the Fundamental Research Funds for the Central Universities and the HPC Resources at Beihang University, and the National Key Research and Development Program of China (Grant No. 2016YFA0300304).

摘要/Abstract

摘要： We study the magnon bands of twisted bilayer honeycomb quantum magnets using linear spin wave theory. Although the interlayer coupling can be ferromagnetic or antiferromagnetic, we keep the intralayer one ferromagnetic to avoid possible frustration. For the interlayer ferromagnetic case, we find the magnon bands have similar features with the corresponding electronic energy spectrums. Although the linear dispersions near the Dirac points are preserved in the magnon bands of twisted bilayer magnets, their slopes are reduced with the decrease of the twist angles. On the other hand, the interlayer antiferromagnetic couplings generate quite different magnon spectra. The two single-layered magnon spectra are usually decoupled due to the opposite orientations of the spins in the two layers. We also develop a low-energy continuous theory for very small twist angles, which has been verified to fit well with the exact tight-binding calculations. Our results may be experimentally observed due to the rapid progress in two-dimensional magnetic materials.

关键词: magnon bands, twisted bilayer, quantum magnets, linear spin wave theory

Abstract: We study the magnon bands of twisted bilayer honeycomb quantum magnets using linear spin wave theory. Although the interlayer coupling can be ferromagnetic or antiferromagnetic, we keep the intralayer one ferromagnetic to avoid possible frustration. For the interlayer ferromagnetic case, we find the magnon bands have similar features with the corresponding electronic energy spectrums. Although the linear dispersions near the Dirac points are preserved in the magnon bands of twisted bilayer magnets, their slopes are reduced with the decrease of the twist angles. On the other hand, the interlayer antiferromagnetic couplings generate quite different magnon spectra. The two single-layered magnon spectra are usually decoupled due to the opposite orientations of the spins in the two layers. We also develop a low-energy continuous theory for very small twist angles, which has been verified to fit well with the exact tight-binding calculations. Our results may be experimentally observed due to the rapid progress in two-dimensional magnetic materials.

Key words: magnon bands, twisted bilayer, quantum magnets, linear spin wave theory

中图分类号: (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))

75.70.Cn

75.75.-c (Magnetic properties of nanostructures) 75.30.Ds (Spin waves) 71.70.Gm (Exchange interactions)

Xingchuan Zhu(朱兴川), Huaiming Guo(郭怀明), and Shiping Feng(冯世平). Magnon bands in twisted bilayer honeycomb quantum magnets[J]. 中国物理B, 2021, 30(7): 77505-077505.

Xingchuan Zhu(朱兴川), Huaiming Guo(郭怀明), and Shiping Feng(冯世平). Magnon bands in twisted bilayer honeycomb quantum magnets[J]. Chin. Phys. B, 2021, 30(7): 77505-077505.

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Magnon bands in twisted bilayer honeycomb quantum magnets

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