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  Delocalization transition of a disordered axion insulator

Song, Z.-D., Lian, B., Queiroz, R., Ilan, R., Bernevig, B. A., & Stern, A. (2021). Delocalization transition of a disordered axion insulator. Physical Review Letters, 127(1): 016602. doi:10.1103/PhysRevLett.127.016602.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0009-0C88-1 Version Permalink: https://hdl.handle.net/21.11116/0000-000B-1668-8
Genre: Journal Article

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PhysRevLett.127.016602.pdf (Publisher version), 459KB
 
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 Creators:
Song, Zhi-Da1, Author
Lian, Biao1, Author
Queiroz, Raquel1, Author
Ilan, Roni1, Author
Bernevig, B. Andrei2, Author
Stern, Ady1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Max Planck Institute of Microstructure Physics, Max Planck Society, Weinberg 2, 06120 Halle, DE, ou_2415691              

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Free keywords: ANDERSON TRANSITION; MAGNETIC-FIELD; HALL; PERCOLATION; SYMMETRY Physics;
 Abstract: The axion insulator is a higher-order topological insulator protected by inversion symmetry. We show that, under quenched disorder respecting inversion symmetry on average, the topology of the axion insulator stays robust, and an intermediate metallic phase in which states are delocalized is unavoidable at the transition from an axion insulator to a trivial insulator. We derive this conclusion from general arguments, from classical percolation theory, and from the numerical study of a 3D quantum network model simulating a disordered axion insulator through a layer construction. We find the localization length critical exponent near the delocalization transition to be ν=1.42±0.12. We further show that this delocalization transition is stable even to weak breaking of the average inversion symmetry, up to a critical strength. We also quantitatively map our quantum network model to an effective Hamiltonian and we find its low-energy k⋅p expansion.

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Language(s): eng - English
 Dates: 2021-06-292021-07-02
 Publication Status: Issued
 Pages: 7
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000669052000015
DOI: 10.1103/PhysRevLett.127.016602
 Degree: -

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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: 127 (1) Sequence Number: 016602 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1