期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 28, 期 49, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/49/495001
关键词
transition metal dichalcogenides; edge modes; nanoribbon; MoS2
资金
- European Commission under the Graphene Flagship [CNECTICT-604391]
- ERC [290846]
- MINECO (Spain) [FIS2014-57432]
- Fondazione Istituto Italiano di Tecnologia
- European Union's Horizon research and innovation programme [696656 GrapheneCore1]
- Iran Science Elites Federation [11/66332]
- European Research Council (ERC) [290846] Funding Source: European Research Council (ERC)
We explore the electronic structure, orbital character and topological aspect of a monolayer MoS2 nanoribbon using tight-binding (TB) and low-energy (k . p) models. We obtain a midgap edge mode in the zigzag ribbon of monolayer MoS2, which can be traced back to the topological properties of the bulk band structure. Monolayer MoS2 can be considered as a valley Hall insulator. The boundary conditions at armchair edges mix the valleys on the edges, and a gap is induced in the edge modes. The spin-orbit coupling in the valence band reduces the hybridization of the bulk states.
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