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| Paper IPM / Physic / 14132 |
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We explore the electronic structure, orbital character and topological aspect of a monolayer MoS2 nanoribbon using tight-binding (TB) and low-energy (\bm k·\bm p ) models. We obtain a mid gap edge mode in a zigzag ribbon, which can be traced back to the topological properties of the bulk band structure. MoS2 can be considered a valley Hall insulator.
The boundary conditions at armchair edges mix the valleys, and a gap is induced in the edge modes. The spin-orbit coupling in the valence band reduces the hybridization.
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