Realization of an intrinsic ferromagnetic topological state in MnBi 8 Te 13
Open Access
- 24 July 2020
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science Advances
- Vol. 6 (30), eaba4275
- https://doi.org/10.1126/sciadv.aba4275
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.Funding Information
- National Science Foundation (NSF-DMR 1534734)
- U.S. Department of Energy (DE-SC0011978)
- U.S. Department of Energy (DEACO5-00OR22725)
- U.S. Department of Energy (DE-AC02-76SF00515)
- U.S. Department of Energy (KC0203020:67037)
- Ministry of Science and Technology, Taiwan (MOST108-2636-M-006-002)
- Ministry of Science and Technology, Taiwan (MOST107-2627-E-006-001)
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