Realization of an intrinsic, ferromagnetic topological state in MnBi8Te13

The interplay between topology and magnetism is essential for realizing novel topological states including the axion insulator, the magnetic Weyl semimetal, etc. An intrinsically ferromagnetic topological material with only the topological bands at the charge neutrality energy has so far remained el...

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Bibliographic Details
Published in:arXiv.org 2021-12
Main Authors: Hu, Chaowei, Ding, Lei, Gordon, Kyle N, Ghosh, Barun, Hung-Ju, Tien, Li, Haoxiang, A Garrison Linn, Shang-Wei, Lian, Cheng-Yi, Huang, Scott Mackey P V Sreenivasa Reddy, Singh, Bahadur, Agarwal, Amit, Bansil, Arun, Song, Miao, Li, Dongsheng, Su-Yang, Xu, Lin, Hsin, Cao, Huibo, Tay-Rong, Chang, Dessau, Dan, Ni, Ni
Format: Article
Language:English
Subjects:
Bismuth tellurides
Clean energy
Current carriers
Ferromagnetic materials
First principles
Hall effect
Magnetism
Metalloids
Photoelectric emission
Topology
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Summary:The interplay between topology and magnetism is essential for realizing novel topological states including the axion insulator, the magnetic Weyl semimetal, etc. An intrinsically ferromagnetic topological material with only the topological bands at the charge neutrality energy has so far remained elusive. By rationally designing the natural heterostructure consisting of [MnBi2Te4] septuple layers and [Bi2Te3] quintuple layers, we report MnBi8Te13 as the first intrinsic ferromagnetic topological material with clean low-energy band structure. Based on the thermodynamic, transport and neutron diffraction measurements, our data show that despite the adjacent [MnBi2Te4] being 44.1 Å apart, MnBi8Te13 manifests long-range ferromagnetism below 10.5 K with strong coupling between magnetism and charge carriers. Our first-principles calculations and angle-resolved photoemission spectroscopy measurements further demonstrate that MnBi8Te13 is an intrinsic ferromagnetic axion state. Therefore, MnBi8Te13 serves as an ideal system to investigate rich emergent phenomena, including the quantized anomalous Hall effect and quantized topological magnetoelectric effect.
ISSN:2331-8422
DOI:10.48550/arxiv.1910.12847