期刊
NATURE MATERIALS
卷 17, 期 1, 页码 21-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT5031
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资金
- CREST, JST [JPMJCR16F1, JPMJCR16F2]
- Leverhulme Trust
- Engineering and Physical Sciences Research Council, UK [EP/M023427/1, EP/I031014/1]
- Royal Society
- Japan Society for Promotion of Science [24224009, 16H03847]
- International Max-Planck Partnership for Measurement and Observation at the Quantum Limit
- Thailand Research Fund
- Suranaree University of Technology [BRG5880010]
- Research Council of Norway through its Centres of Excellence funding scheme [262633]
- Fripro program [250985]
- Institute for Basic Science in Korea [IBS-R009-D1]
- Research Resettlement Fund for the new faculty of Seoul National University
- National Research Foundation of Korea (NRF) - Ministry of Education [0426-20150011]
- EPSRC [EP/K503162/1, EP/G03673X/1, EP/L505079/1, EP/L015110/1]
- IMPRS
- EPSRC [EP/M023427/1, EP/I031014/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I031014/1, 1651718, 1649897, EP/M023427/1, 1383002] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [16H03847] Funding Source: KAKEN
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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