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  Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides

Bahramy, M. S., Clark, O. J., Yang, B.-J., Feng, J., Bawden, L., Riley, J. M., et al. (2018). Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides. Nature Materials, 17(1), 21-27. doi:10.1038/NMAT5031.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-645A-B Version Permalink: http://hdl.handle.net/21.11116/0000-0003-D384-9
Genre: Journal Article

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 Creators:
Bahramy, M. S.1, Author
Clark, O. J.1, Author
Yang, B.-J.1, Author
Feng, J.1, Author
Bawden, L.1, Author
Riley, J. M.1, Author
Marković, I.2, Author              
Mazzola, F.1, Author
Sunko, V.1, Author
Biswas, D.1, Author
Cooil, S. P.1, Author
Jorge, M.1, Author
Wells, J. W.1, Author
Leandersson, M.1, Author
Balasubramanian, T.1, Author
Fujii, J.1, Author
Vobornik, I.1, Author
Rault, J. E.1, Author
Kim, T. K.1, Author
Hoesch, M.1, Author
Okawa, K.1, AuthorAsakawa, M.1, AuthorSasagawa, T.1, AuthorEknapakul, T.1, AuthorMeevasana, W.1, AuthorKing, P. D. C.1, Author more..
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: Transition-metal dichalcogenides (TMDs) are renowned for their rich and varied bulk properties, while their single-layer variants have become one of the most prominent examples of two-dimensional materials beyond graphene. Their disparate ground states largely depend on transition metal d-electron-derived electronic states, on which the vast majority of attention has been concentrated to date. Here, we focus on the chalcogen-derived states. From density-functional theory calculations together with spin-and angle-resolved photoemission, we find that these generically host a co-existence of type-I and type-II three-dimensional bulk Dirac fermions as well as ladders of topological surface states and surface resonances. We demonstrate how these naturally arise within a single p-orbital manifold as a general consequence of a trigonal crystal field, and as such can be expected across a large number of compounds. Already, we demonstrate their existence in six separate TMDs, opening routes to tune, and ultimately exploit, their topological physics.

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Language(s): eng - English
 Dates: 2018-01-152018-01-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/NMAT5031
 Degree: -

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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: 17 (1) Sequence Number: - Start / End Page: 21 - 27 Identifier: ISSN: 1476-1122
CoNE: /journals/resource/111054835734000