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  Higher-order topology of the axion insulator EuIn2As2

Xu, Y., Song, Z., Wang, Z., Weng, H., & Dai, X. (2019). Higher-order topology of the axion insulator EuIn2As2. Physical Review Letters, 122(25): 256402. doi:10.1103/PhysRevLett.122.256402.

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PhysRevLett.122.256402.pdf (Publisher version), 2MB
 
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https://doi.org/10.1103/PhysRevLett.122.256402 (Publisher version)
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Xu, Yuanfeng1, Author              
Song, Zhida2, Author
Wang, Zhijun2, Author
Weng, Hongming2, Author
Dai, Xi2, Author
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1Max Planck Institute of Microstructure Physics, Max Planck Society, Weinberg 2, 06120 Halle, DE, ou_2415691              
2External Organizations, ou_persistent22              

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 Abstract: Based on first-principles calculations and symmetry analysis, we propose that EuIn2As2 is a long-awaited axion insulator with antiferromagnetic (AFM) long-range order. Characterized by the parity-based invariant ℤ4=2, the topological magnetoelectric effect is quantized with θ=π in the bulk, with a band gap as large as 0.1 eV. When the staggered magnetic moments of the AFM phase are along the a or b axis, it is also a topological crystalline insulator phase with gapless surface states emerging on (100), (010), and (001) surfaces. When the magnetic moments are along the c axis, both the (100) and (001) surfaces are gapped, and the material can also be viewed as a high-order topological insulator with one-dimensional chiral states existing on the hinges between those gapped surfaces. We have calculated both the topological surface states and the hinge state in different phases of the system, respectively, which can be detected by angle-resolved photoemission spectroscopy or STM experiments.

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 Dates: 2019-06-252019-06-28
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: P13745
DOI: 10.1103/PhysRevLett.122.256402
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 122 (25) Sequence Number: 256402 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1