Graphene on Ir(111): Physisorption with chemical modulation

Busse C, Lazić P, Djemour R, Coraux J, Gerber T, Atodiresei N, Caciuc V, Brako R, N'Diaye A, Blügel S, Zegenhagen J, Michely T

Research article (journal)

Abstract

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 vanderWaals 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.

Details zur Publikation

Release year: 2011
Language in which the publication is written: English
Link to the full text: http://www.scopus.com/inward/record.url?eid=2-s2.0-79961053397&partnerID=40&md5=7ae0e4a5bd04750b44bfe37d673174fd