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Paper   IPM / Physic / 14132
School of Physics
  Title:   Edge modes in zigzag and armchair ribbons of monolayer MoS2
  Author(s): 
1.  H. Rostami
2.  R. Asgari
3.  F. Guinea
  Status:   Published
  Journal: J. Physics: Condens. Matter
  No.:  49
  Vol.:  28
  Year:  2016
  Pages:   495001 (15pp)
  Supported by:  IPM
  Abstract:
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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