Graphene on Ir(111): Physisorption with Chemical Modulation

The nonlocal van der Waals density functional approach is applied to calculate the binding of graphene to Ir(111). The precise agreement of the calculated mean height h = 3.41 Å of the C atoms with their mean height h = (3.38±0.04) Å as measured by the x-ray standing wave technique provides a benc...

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Bibliographic Details
Published in:	Physical review letters Vol. 107; no. 3; p. 036101
Main Authors:	Busse, Carsten, Lazić, Predrag, Djemour, Rabie, Coraux, Johann, Gerber, Timm, Atodiresei, Nicolae, Caciuc, Vasile, Brako, Radovan, N’Diaye, Alpha T., Blügel, Stefan, Zegenhagen, Jörg, Michely, Thomas
Format:	Journal Article
Language:	English
Published:	United States 15.07.2011
ISSN:	0031-9007, 1079-7114, 1079-7114
Online Access:	Get full text
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Summary:	The nonlocal van der Waals density functional approach is applied to calculate the binding of graphene to Ir(111). The precise agreement of the calculated mean height h = 3.41 Å of the C atoms with their mean height h = (3.38±0.04) Å as measured by the x-ray standing wave technique provides a benchmark for the applicability of the nonlocal functional. We find bonding of graphene to Ir(111) to be due to the van der Waals interaction with an antibonding average contribution from chemical interaction. Despite its globally repulsive character, in certain areas of the large graphene moiré unit cell charge accumulation between Ir substrate and graphene C atoms is observed, signaling a weak covalent bond formation.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114 1079-7114
DOI:	10.1103/PhysRevLett.107.036101