Abstract
We have investigated effects of surface hydrogenation on the topological properties of multilayer graphene by using density functional theory calculations and a tight-binding model. Hydrogen adsorption on a dimer site of a surface layer decouples the surface layer from the rest of the layers. Hydrogen adsorption on a nondimer site introduces a band mixing between the hydrogenated graphene and the rest of the graphene layers. The valley Hall effects and spin-valley-resolved Chern numbers of multilayer graphene, calculated as a function of the sublattice potential and the potential perpendicular to the layers, was found to be sensitive to details of inversion symmetry-breaking potentials. While the topological invariant depends on the adsorption site and spin polarization, surface-hydrogenated M-layer graphene was found to be topologically equivalent to (M-1)-layer graphene under inversion symmetry-breaking potentials regardless of the adsorption site.
| Original language | English |
|---|---|
| Pages (from-to) | 137-142 |
| Number of pages | 6 |
| Journal | Current Applied Physics |
| Volume | 19 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2019 Feb |
Bibliographical note
Funding Information:This work was supported by the National Research Foundation of Korea (Project Nos. 2016R1D1A1A09917003 and 2016R1D1A1B03931144 ). K.W.L. gratefully acknowledges a Korea University research grant.
Publisher Copyright:
© 2018 Korean Physical Society
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
Keywords
- Multilayer graphene
- Quantum valley Hall effect
- Surface hydrogenation
- Topological phase
ASJC Scopus subject areas
- General Materials Science
- General Physics and Astronomy