Evaluation of New Density Functional with Account of van der Waals   Forces by Use of Experimental H2 Physisorption Data on Cu(111)
  Detailed experimental data for physisorption potential-energy curves of H2 on low-indexed faces of Cu challenge theory. Recently, density-functional theory has been developed to also account for nonlocal correlation effects, including van der Waals forces. We show that one functional, denoted vdW-DF2, gives a potential-energy curve promisingly close to the experiment-derived physisorptionenergy curve. The comparison also gives indications for further improvements of the functionals. 
Kyuho Lee, Andr\'e K Kelkkanen, Kristian Berland, Stig Andersson,   David C Langreth, Elsebeth Schr\"oder, Bengt I Lundqvist...
cond-mat.mtrl-sci