Quasi-freestanding graphene on Ni(111) by Cs intercalation.

Citation data:

Scientific reports, ISSN: 2045-2322, Vol: 6, Issue: 1, Page: 26753

Publication Year:
2016
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Repository URL:
http://hdl.handle.net/10754/611196
PMID:
27225324
DOI:
10.1038/srep26753
PMCID:
PMC4880887
Author(s):
Alattas, Maha Hassan Mohssen; Schwingenschlögl, Udo
Publisher(s):
Springer Nature
Tags:
Multidisciplinary
article description
A possible approach to achieve quasi-freestanding graphene on a substrate for technological purpose is the intercalation of alkali metal atoms. Cs intercalation between graphene and Ni(111) therefore is investigated using density functional theory, incorporating van der Waals corrections. It is known that direct contact between graphene and Ni(111) perturbs the Dirac states. We find that Cs intercalation restores the linear dispersion characteristic of Dirac fermions, which agrees with experiments, but the Dirac cone is shifted to lower energy, i.e., the graphene sheet is n-doped. Cs intercalation therefore decouples the graphene sheet from the substrate except for a charge transfer. On the other hand, the spin polarization of Ni(111) does not extend through the intercalated atoms to the graphene sheet, for which we find virtually spin-degeneracy.