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arXiv · 1511.07003

Edge modes in zigzag and armchair ribbons of monolayer MoS$_2$

Habib Rostami·Reza Asgari·Francisco Guinea
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Abstract

We explore the electronic structure, orbital character and topological aspect of a monolayer MoS$_2$ nanoribbon using tight-binding (TB) and low-energy (${\bm k}\cdot{\bm p} $) models. We obtain a mid-gap edge mode in the zigzag ribbon of monolayer MoS$_2$, which can be traced back to the topological properties of the bulk band structure. Monolayer MoS$_2$ 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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Habib Rostami, Reza Asgari, Francisco Guinea. 2016-10-29. Edge modes in zigzag and armchair ribbons of monolayer MoS$_2$. https://doi.org/10.1088/0953-8984%2F28%2F49%2F495001

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