Abstract:
:The intrinsic atomic mechanisms responsible for electronic doping of epitaxial graphene Moirés on transition metal surfaces is still an open issue. To better understand this process we have carried out a first-principles full characterization of the most representative Moiré superstructures observed on the Gr/Pt(111) system and confronted the results with atomically resolved scanning tunneling microscopy experiments. We find that for all reported Moirés the system relaxes inducing a non-negligible atomic corrugation both, at the graphene and at the outermost platinum layer. Interestingly, a mirror "anti-Moiré" reconstruction appears at the substrate, giving rise to the appearance of pinning-points. We show that these points are responsible for the development of the superstructure, while charge from the Pt substrate is injected into the graphene, inducing a local n-doping, mostly localized at these specific pinning-point positions.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Martínez JI,Merino P,Pinardi AL,Gonzalo OI,López MF,Méndez J,Martín-Gago JAdoi
10.1038/srep20354subject
Has Abstractpub_date
2016-02-08 00:00:00pages
20354issn
2045-2322pii
srep20354journal_volume
6pub_type
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