Topological magnetoelectric response in ferromagnetic axion insulators

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外文摘要：The topological magnetoelectric effect(TME)is a hallmark response of the topological field theory,which provides a paradigm shift in the study of emergent topological phenomena.However,its direct observation is yet to be realized due to the demanding magnetic configuration required to gap all surface states.Here,we theoretically propose that axion insulators with a simple ferromagnetic configuration,such as the MnBi2Te4/(Bi2Te3)n family,provide an ideal playground to realize the TME.In the designed triangular prism geometry,all the surface states are magnetically gapped.Under a vertical electric field,the surface Hall currents give rise to a nearly half-quantized orbital moment,accompanied by a gapless chiral hinge mode circulating in parallel.Thus,the orbital magnetization from the two topological origins can be easily distinguished by reversing the electric field.Our work paves the way for direct observation of the TME in realistic axion-insulator materials.

外文关键词：

topological magnetoelectric effectaxion insulatormagnetic topological materials

作者：

Yuhao Wan、Jiayu Li、Qihang Liu

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作者单位：

Department of Physics and Shenzhen Institute for Quantum Science and Engineering(SIQSE),Southern University of Science and Technology,Shenzhen 518055,China

Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices,Southern University of Science and Technology,Shenzhen 518055,China

Guangdong Provincial Key Laboratory for Computational Science and Material Design,Southern University of Science and Technology,Shenzhen 518055,China

基金：

National Key R&D Program of ChinaScience,Technology and Innovation Commission of Shenzhen MunicipalityGuangdong Innovative and Entrepreneurial Research Team ProgramGuangdong Provincial Key Laboratory for Computational Science and Material Design

项目编号：

2020YFA0308900ZDSYS201909020929052852017ZT07C0622019B030301001

出版年：

2024

DOI：

10.1093/nsr/nwac138

国家科学评论(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.11(2)

参考文献量63