期刊
ACS NANO
卷 6, 期 1, 页码 199-204出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn203841q
关键词
Na absorption; Ir superlattice; graphene; photoemission; STM
类别
资金
- European Science Foundation (ESF) under the EUROCORES
- Swiss National Science Foundation
- Italian Ministry of Education, University, and Research (FIRB Futuro in Ricerca, PLASMOGRAPH)
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 ISM? sodium atoms to graphene raises the graphene Fermi level by similar to 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 band gap of Delta(Na/Ir/G) = 740 meV, comparable to the one of Ge and with preserved high group velocity of the charge carriers.
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