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

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Title
Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides
Author(s)
Bahramy M.S.; Clark O.J.; Bohm Jung Yang; Feng J.; Bawden L.; Riley J.M.; Markovic I.; Mazzola F.; Sunko V.; Biswas D.; Cooil S.P.; Jorge M.; Wells J.W.; Leandersson M.; Balasubramanian T.; Fujii J.; Vobornik I.; Rault J.E.; Kim T.K.; Hoesch M.; Okawa K.; Asakawa M.; Sasagawa T.; Eknapakul T.; Meevasana W.; King P.D.C.
Publication Date
2018-01
Journal
NATURE MATERIALS, v.17, no.1, pp.21 - 28
Publisher
NATURE PUBLISHING GROUP
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. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/4303
ISSN
1476-1122
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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