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Title: van der Waals density functionals built upon the electron-gas tradition: Facing the challenge of competing interactions

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4871731· OSTI ID:1130429

The theoretical description of sparse matter attracts much interest, in particular for those groundstateproperties that can be described by density functional theory (DFT). One proposed approach,the van der Waals density functional (vdW-DF) method, rests on strong physical foundations andoffers simple yet accurate and robust functionals. A very recent functional within this method calledvdW-DF-cx [K. Berland and P. Hyldgaard, Phys. Rev. B, in print] stands out in its attempt to usean exchange energy derived from the same plasmon-based theory from which the nonlocal correlationenergy was derived. Encouraged by its good performance for solids, layered materials, and aromaticmolecules, we apply it to several systems that are characterized by competing interactions. Theseinclude the ferroelectric response in PbTiO3, the adsorption of small molecules within metal-organicframeworks (MOFs), the graphite/diamond phase transition, and the adsorption of an aromaticmoleculeon the Ag(111) surface. Our results indicate that vdW-DF-cx is overall well suited totackle these challenging systems. In addition to being a competitive density functional for sparsematter, the vdW-DF-cx construction presents a more robust general purpose functional that couldbe applied to a range of materials problems with a variety of competing interactions.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1130429
Journal Information:
Journal of Chemical Physics, Vol. 140, Issue 18; ISSN 0021-9606
Country of Publication:
United States
Language:
English

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