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I05-ARPES	Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides M. S. Bahramy , O. J. Clark , B.-J. Yang , J. Feng , L. Bawden , J. M. Riley , I. Markovic , F. Mazzola , V. Sunko , D. Biswas , S. P. Cooil , M. Jorge , J. W. Wells , M. Leandersson , T. Balasubramanian , J. Fujii , I. Vobornik , J. E. Rault , T. K. Kim , M. Hoesch , K. Okawa , M. Asakawa , T. Sasagawa , T. Eknapakul , W. Meevasana , P. D. C. King Nature Materials 17, 21 DOI: 10.1038/nmat5031 Diamond Proposal Number(s): [2469, 9500, 13438, 14927] Show Abstract ▼ 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.	Nov 2017

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I05-ARPES

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