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 Lien, Cheng Yi Huang, Scott Mackey, Jinyu Liu, P. V. Sreenivasa Reddy, Bahadur Singh, Amit Agarwal, Arun Bansil, Miao Song, Dongsheng Li, Su Yang Xu, Hsin Lin, Huibo CaoTay Rong Chang, Dan Dessau, Ni Ni

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Novel magnetic topological materials pave the way for studying the interplay between band topology and magnetism. However, an intrinsically ferromagnetic topological material with only topological bands at the charge neutrality energy has so far remained elusive. Using rational design, we synthesized MnBi8Te13, a natural heterostructure with [MnBi2Te4] and [Bi2Te3] layers. Thermodynamic, transport, and neutron diffraction measurements 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. First-principles calculations and angle-resolved photoemission spectroscopy measurements reveal it is an axion insulator with sizable surface hybridization gaps. Our calculations further demonstrate the hybridization gap persists in the two-dimensional limit with a nontrivial Chern number. Therefore, as an intrinsic ferromagnetic axion insulator with clean low-energy band structures, MnBi8Te13 serves as an ideal system to investigate rich emergent phenomena, including the quantized anomalous Hall effect and quantized magnetoelectric effect.

Original languageEnglish
Article numberaba4275
JournalScience Advances
Volume6
Issue number30
DOIs
Publication statusPublished - 2020 Jul

All Science Journal Classification (ASJC) codes

  • General

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