Journal
PHYSICAL REVIEW B
Volume 84, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.201401
Keywords
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Funding
- European Science Foundation (ESF) under EUROCORES
- Austrian Science Fund (FWF) [I422-N16]
- SFB ViCoM
- Austrian Science Fund (FWF) [I422] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [I 422] Funding Source: researchfish
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The adsorption of graphene on Ni(111) has been investigated on the basis of the adiabatic-connection fluctuation-dissipation theorem in the random phase approximation (RPA). Although we find a significant hybridization between the graphene pi orbitals and Ni d(z)2 states at a binding distance of 2.17 angstrom, the adsorption energy is still in the range of a typical physisorption (67 meV per carbon). An important contribution to the energy is related to a decrease in the exchange energy resulting from the adsorption-induced lower symmetry in the graphene layer. The energetics can be well reproduced using the computationally significantly cheaper van der Waals density functional theory with an appropriately chosen exchange-correlation functional.
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