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A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines

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Clark_2019_General_route_Electron_Struct_AAM.pdf (15.51Mb)
Date
11/03/2019
Author
Clark, Oliver Jon
Mazzola, Federico
Markovic, Igor
Riley, Jonathon Mark
Feng, Jiagui
Yang, B.-J.
Sumida, K.
Okuda, T.
Fujii, J.
Vobornik, I.
Kim, T. K.
Okawa, K.
Sasagawa, T.
Bahramy, M. S.
King , Phil
Keywords
Dirac semimetals
Topological insulators
Spin-resolved ARPES
Transition metal dichalcogenides (TMDs)
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
DAS
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Abstract
The band inversions that generate the topologically non-trivial band gaps of topological insulators and the isolated Dirac touching points of three-dimensional Dirac semimetals generally arise from the crossings of electronic states derived from different orbital manifolds. Recently, the concept of single orbital-manifold band inversions occurring along high-symmetry lines have been demonstrated, stabilising multiple bulk and surface Dirac fermions. Here, we discuss the underlying ingredients necessary to achieve such phases, and discuss their existence within the family of transition-metal dichalcogenides. We show how their three-dimensional band structures naturally produce only small kz; projected band gaps, and demonstrate how these play a significant role in shaping the surface electronic structure of these materials. We demonstrate, through spin- and angle-resolved photoemission and density functional theory calculations, how the surface electronic structures of the group-X TMDs PtSe2 and PdTe2 are host to up to five distinct surface states, each with complex band dispersions and spin textures. Finally, we discuss how the origin of several recently-realised instances of topological phenomena in systems outside of the TMDs, including the iron-based superconductors, can be understood as a consequence of the same underlying mechanism driving kz-mediated band inversions in the TMDs.
Citation
Clark , O J , Mazzola , F , Markovic , I , Riley , J M , Feng , J , Yang , B-J , Sumida , K , Okuda , T , Fujii , J , Vobornik , I , Kim , T K , Okawa , K , Sasagawa , T , Bahramy , M S & King , P 2019 , ' A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines ' , Electronic Structure , vol. 1 , no. 1 , 014002 . https://doi.org/10.1088/2516-1075/ab09b7
Publication
Electronic Structure
Status
Peer reviewed
DOI
https://doi.org/10.1088/2516-1075/ab09b7
ISSN
2516-1075
Type
Journal article
Rights
© 2019, IOP Publishing Ltd. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1088/2516-1075/ab09b7
Description
Funding: EPSRC PhD studentship support through grant No. EP/K503162/1 (OJC); PhD studentship support from the IM-PRS for the Chemistry and Physics of Quantum Materials (IM).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/19634

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