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arXiv · 1910.12847

Realization of an intrinsic, ferromagnetic topological state in MnBi8Te13

Chaowei Hu·Lei Ding·Kyle N. Gordon·Barun Ghosh·Hung-Ju Tien·Haoxiang Li·A. Garrison Linn·Shang-Wei Lian·Cheng-Yi Huang·Scott Mackey. P. V. Sreenivasa Reddy·Bahadur Singh·Amit Agarwal·Arun Bansil·Miao Song·Dongsheng Li·Su-Yang Xu·Hsin Lin·Huibo Cao·Tay-Rong Chang·Dan Dessau·Ni Ni
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Abstract

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 {\AA} 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.

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Chaowei Hu, Lei Ding, Kyle N. Gordon, Barun Ghosh, Hung-Ju Tien, Haoxiang Li, A. Garrison Linn, Shang-Wei Lian, Cheng-Yi Huang, Scott Mackey. P. V. Sreenivasa Reddy, Bahadur Singh, Amit Agarwal, Arun Bansil, Miao Song, Dongsheng Li, Su-Yang Xu, Hsin Lin, Huibo Cao, Tay-Rong Chang, Dan Dessau, Ni Ni. 2019-10-28. Realization of an intrinsic, ferromagnetic topological state in MnBi8Te13. https://doi.org/10.1126/sciadv.aba4275

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