Large Bandgap Opening Between Graphene Dirac Cones Induced by Na Adsorption onto an Ir Superlattice
arXiv:1112.2532 · doi:10.1021/nn203841q
Abstract
We investigate the effects of Na adsorption on the electronic structure of bare and Ir cluster superlattice covered epitaxial graphene on Ir(111) using angle-resolved photoemission spectroscopy and scanning tunneling microscopy. At Na saturation coverage a massive charge migration from sodium atoms to graphene raises the graphene Fermi level by about 1.4 eV relative to its neutrality point. We find that Na is adsorbed on top of the graphene layer and when coadsorbed onto an Ir cluster superlattice it results in the opening of a large bandgap of Δ = 740 meV comparable to the one of Ge and with preserved high group velocity of the charge carriers.
16 pages, 5 figures. To be published in ACS Nano
References in corpus (11)
- Electric Field Effect in Atomically Thin Carbon Films
- Energy Band Gap Engineering of Graphene Nanoribbons
- Room-Temperature Quantum Hall Effect in Graphene
- Substrate-induced band gap opening in epitaxial graphene
- Two Dimensional Ir-Cluster Lattices on Moiré of Graphene with Ir(111)
- Dirac Cones and Minigaps for Graphene on Ir(111)
- Graphene Antidot Lattices - Designed Defects and Spin Qubits
- Energy Gaps and Stark Effect in Boron Nitride Nanoribbons
- Energy gap opening in submonolayer lithium on graphene: Local density functional and tight-binding calculations
- Band dispersion in the deep 1s core level of graphene
- The stability of graphene band structures against an external periodic perturbation; Na on Graphene
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