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  Visualizing coexisting surface states in the weak and crystalline topological insulator Bi2TeI

Avraham, N., Nayak, A. K., Steinbok, A., Norris, A., Fu, H., Sun, Y., et al. (2020). Visualizing coexisting surface states in the weak and crystalline topological insulator Bi2TeI. Nature Materials, 19, 610-616. doi:10.1038/s41563-020-0651-6.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-0DB4-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-BB1B-A
Genre: Journal Article

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 Creators:
Avraham, Nurit1, Author
Nayak, Abhay Kumar1, Author
Steinbok, Aviram1, Author
Norris, Andrew1, Author
Fu, Huixia1, Author
Sun, Yan2, Author              
Qi, Yanpeng2, Author              
Pan, Lin2, Author              
Isaeva, Anna1, Author
Zeugner, Alexander1, Author
Felser, Claudia3, Author              
Yan, Binghai1, Author
Beidenkopf, Haim1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Bi2TeI is identified as a dual topological insulator. It is a weak topological insulator with metallic states at the (010) surfaces and a topological crystalline insulator at the (001) surfaces. Dual topological materials are unique topological phases that host coexisting surface states of different topological nature on the same or on different material facets. Here, we show that Bi2TeI is a dual topological insulator. It exhibits band inversions at two time reversal symmetry points of the bulk band, which classify it as a weak topological insulator with metallic states on its 'side' surfaces. The mirror symmetry of the crystal structure concurrently classifies it as a topological crystalline insulator. We investigated Bi2TeI spectroscopically to show the existence of both two-dimensional Dirac surface states, which are susceptible to mirror symmetry breaking, and one-dimensional channels that reside along the step edges. Their mutual coexistence on the step edge, where both facets join, is facilitated by momentum and energy segregation. Our observation of a dual topological insulator should stimulate investigations of other dual topology classes with distinct surface manifestations coexisting at their boundaries.

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Language(s): eng - English
 Dates: 2020-03-232020-03-23
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000521525900002
DOI: 10.1038/s41563-020-0651-6
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Title: Nature Materials
  Abbreviation : Nat. Mater.
Source Genre: Journal
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Publ. Info: London, UK : Nature Pub. Group
Pages: - Volume / Issue: 19 Sequence Number: - Start / End Page: 610 - 616 Identifier: ISSN: 1476-1122
CoNE: https://pure.mpg.de/cone/journals/resource/111054835734000