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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. (author)
University of Tokyo,RIKEN, Center for Emergent Matter Science
Clark, O. J. (author)
University of St Andrews
Yang, B. J. (author)
Seoul National University,Institute for Basic Science, Korea
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Feng, J. (author)
Suzhou Institute of Nano-Tech and Nano-Bionics, CAS,University of St Andrews
Bawden, L. (author)
University of St Andrews
Riley, J. M. (author)
University of St Andrews,Diamond Light Source
Markovic, I. (author)
University of St Andrews,Max Planck Institute for Chemical Physics of Solids
Mazzola, F. (author)
University of St Andrews
Sunko, V. (author)
University of St Andrews,Max Planck Institute for Chemical Physics of Solids
Biswas, D. (author)
University of St Andrews
Cooil, S. P. (author)
Norwegian University of Science and Technology
Jorge, M. (author)
Norwegian University of Science and Technology
Wells, J. W. (author)
Norwegian University of Science and Technology
Leandersson, M. (author)
Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
Balasubramanian, T. (author)
Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
Fujii, J. (author)
CNR Istituto Officina dei Materiali (IOM)
Vobornik, I. (author)
CNR Istituto Officina dei Materiali (IOM)
Rault, J. E. (author)
Synchrotron SOLEIL
Kim, T. K. (author)
Diamond Light Source
Hoesch, M. (author)
Diamond Light Source
Okawa, K. (author)
Tokyo Institute of Technology
Asakawa, M. (author)
Tokyo Institute of Technology
Sasagawa, T. (author)
Tokyo Institute of Technology
Eknapakul, T. (author)
Suranaree University of Technology
Meevasana, W. (author)
Thailand Center of Excellence in Physics,Suranaree University of Technology
King, P. D.C. (author)
University of St Andrews
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 (creator_code:org_t)
2018
2018
English 7 s.
In: Nature Materials. - 1476-1122. ; 17:1, s. 21-27
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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