Graphene on Ir(111): Physisorption with chemical modulation
The non-local van der Waals density functional (vdW-DF) 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 \pm 0.04) Å as measured by the X-ray standing wave (XSW) techniq...
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| creator | Busse, Carsten Lazić, Predrag Rabie Djemour Coraux, Johann Gerber, Timm Atodiresei, Nicolae Caciuc, Vasile Brako, Radovan N'Diaye, Alpha T Blügel, Stefan Zegenhagen, Jörg Michely, Thomas |
| description | The non-local van der Waals density functional (vdW-DF) 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 \pm 0.04) Å as measured by the X-ray standing wave (XSW) technique provides a benchmark for the applicability of the non-local 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 grapheneC atoms is observed, signaling a weak covalent bond formation. |
| doi_str_mv | 10.48550/arxiv.1105.3883 |
| format | Article |
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| subjects | Covalent bonds Graphene Mathematical analysis Organic chemistry Physics - Materials Science Standing waves Substrates Unit cell |
| title | Graphene on Ir(111): Physisorption with chemical modulation |
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