Effect of surface hydrogenation on the topological properties of multilayer graphene

Kyu Won Lee, Cheol Eui Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 languageEnglish
Pages (from-to)137-142
Number of pages6
JournalCurrent Applied Physics
Volume19
Issue number2
DOIs
Publication statusPublished - 2019 Feb 1

Fingerprint

Graphite
Graphene
Hydrogenation
hydrogenation
graphene
Multilayers
Adsorption
adsorption
valleys
Hydrogen
broken symmetry
surface layers
inversions
Spin polarization
Hall effect
hydrogen
Dimers
sublattices
Density functional theory
dimers

Keywords

  • Multilayer graphene
  • Quantum valley Hall effect
  • Surface hydrogenation
  • Topological phase

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Effect of surface hydrogenation on the topological properties of multilayer graphene. / Lee, Kyu Won; Lee, Cheol Eui.

In: Current Applied Physics, Vol. 19, No. 2, 01.02.2019, p. 137-142.

Research output: Contribution to journalArticle

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