Role of the Pinning Points in epitaxial Graphene Moiré Superstructures on the Pt(111) Surface.

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 Rep

journal_title

Scientific reports

authors

Martínez JI,Merino P,Pinardi AL,Gonzalo OI,López MF,Méndez J,Martín-Gago JA

doi

10.1038/srep20354

subject

Has Abstract

pub_date

2016-02-08 00:00:00

pages

20354

issn

2045-2322

pii

srep20354

journal_volume

6

pub_type

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