Physics – Condensed Matter – Materials Science
Scientific paper
2009-09-12
Phys. Rev. B 80, 205414 (2009)
Physics
Condensed Matter
Materials Science
11 pages including 4 figures; related publications can be found at http://www.fhi-berlin.mpg.de/th/th.html
Scientific paper
10.1103/PhysRevB.80.205414
We use different semi-empirical dispersion correction schemes to assess the role of long-range van der Waals interactions in the adsorption of the prototypical molecular switch azobenzene (C6H5-N2-C6H5) at the coinage metal surfaces Cu(111), Ag(111) and Au(111). Compared to preceding density-functional theory results employing a semi-local exchange and correlation functional we obtain partly sizable changes of the computed adsorption geometry and energetics. The discomforting scatter in the results provided by the different schemes is largely attributed to the unknown form of the damping function in the semi-empirical correction expression. Using the congeneric problem of the adsorption of benzene as a vehicle to connection with experiment, we cautiously conclude that the account of dispersive interactions at the metal surfaces provided by the various schemes is in the right ballpark, with the more recent, general schemes likely to overbind.
McNellis Erik
Meyer Jorg
Reuter Karsten
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