TY - JOUR
T1 - Effect of surface hydrogenation on the topological properties of multilayer graphene
AU - Lee, Kyu Won
AU - Lee, Cheol Eui
N1 - 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.
PY - 2019/2
Y1 - 2019/2
N2 - 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.
AB - 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.
KW - Multilayer graphene
KW - Quantum valley Hall effect
KW - Surface hydrogenation
KW - Topological phase
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U2 - 10.1016/j.cap.2018.11.014
DO - 10.1016/j.cap.2018.11.014
M3 - Article
AN - SCOPUS:85057882430
SN - 1567-1739
VL - 19
SP - 137
EP - 142
JO - Current Applied Physics
JF - Current Applied Physics
IS - 2
ER -