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  Resolving the topological classification of bismuth with topological defects

Nayak, A. K., Reiner, J., Queiroz, R., Fu, H., Shekhar, C., Yan, B., et al. (2019). Resolving the topological classification of bismuth with topological defects. Science Advances, eaax6996, pp. 1-8. doi:10.1126/sciadv.aax6996.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-4DB4-A Version Permalink: http://hdl.handle.net/21.11116/0000-0005-4DDD-D
Genre: Journal Article

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 Creators:
Nayak, Abhay Kumar1, Author
Reiner, Jonathan1, Author
Queiroz, Raquel1, Author
Fu, Huixia1, Author
Shekhar, Chandra2, Author              
Yan, Binghai1, Author
Felser, Claudia3, Author              
Avraham, Nurit1, Author
Beidenkopf, Haim1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: Bismuth, Electric insulators, Screw dislocations, Screws, Topological insulators, Critical region, Helical modes, Small energy, Time reversal, Topological classification, Topological defect, Topological phase, Wide energy range, Topology
 Abstract: The growing diversity of topological classes leads to ambiguity between classes that share similar boundary phenomenology. This is the status of bulk bismuth. Recent studies have classified it as either a strong or a higher-order topological insulator, both of which host helical modes on their boundaries. We resolve the topological classification of bismuth by spectroscopically mapping the response of its boundary modes to a screw-dislocation. We find that the one-dimensional mode, on step-edges, extends over a wide energy range and does not open a gap near the screw-dislocations. This signifies that this mode binds to the screw-dislocation, as expected for a material with nonzero weak indices. We argue that the small energy gap, at the time reversal invariant momentum L, positions bismuth within the critical region of a topological phase transition between a higher-order topological insulator and a strong topological insulator with nonzero weak indices. Copyright © 2019 The Authors, some rights reserved;

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Language(s): eng - English
 Dates: 2019-11-012019-11-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1126/sciadv.aax6996
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: - Sequence Number: eaax6996 Start / End Page: 1 - 8 Identifier: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548