Networks of ABA and ABC stacked graphene on mica observed by scanning tunneling microscopy

Graphene flakes are prepared on freshly cleaved mica by exfoliation and studied by scanning tunneling microscopy in ultra high vacuum. On few-layer graphene, a triangular network of partial dislocations separating ABC stacked and ABA stacked graphene was found similar to the networks occasionally vi...

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Bibliographic Details
Published in:	Surface science Vol. 610; pp. 53 - 58
Main Authors:	Hattendorf, S., Georgi, A., Liebmann, M., Morgenstern, M.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier B.V 01-04-2013 Elsevier
Subjects:	ABC stacking fault Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Electronic structure Exact sciences and technology Fermi surfaces Graphene High vacuum Mica Networks Physics Scanning tunneling microscopy Scanning tunneling spectroscopy Scanning tunneling microscopy Scanning tunneling spectroscopy ABC stacking fault Graphene Mica Stacking faults
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Summary:	Graphene flakes are prepared on freshly cleaved mica by exfoliation and studied by scanning tunneling microscopy in ultra high vacuum. On few-layer graphene, a triangular network of partial dislocations separating ABC stacked and ABA stacked graphene was found similar to the networks occasionally visible on freshly cleaved HOPG. We found differences in the electronic structure of ABC and ABA stacked areas by scanning tunneling spectroscopy, i.e., a pronounced peak at 0.25eV above the Fermi level exclusively in the ABA areas, which is shown to be responsible for the different apparent heights observed in STM images. ► STM images on few-layer graphene exfoliated on mica exhibit triangular patterns. ► Pattern is a network of partial dislocations separating ABA and ABC stacked areas. ► STS shows a pronounced peak at 0.25eV exclusively in ABA areas. ► Peak causes apparent height differences in STM images. ► Possibly caused by Fabry–Perot type interference strengthened by lateral confinement
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0039-6028 1879-2758
DOI:	10.1016/j.susc.2013.01.005