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

Kristian Berland (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem) ; Calvin A. Arter ; Valentino R. Cooper ; Kyuho Lee ; Bengt I. Lundqvist (Institutionen för teknisk fysik, Material- och ytteori) ; Elsebeth Schröder (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; T. Thonhauser ; Per Hyldgaard (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem)
Journal of Chemical Physics (0021-9606). Vol. 140 (2014), p. 18A539 .
[Artikel, refereegranskad vetenskaplig]

The theoretical description of sparse matter attracts much interest, in particular for those ground-state properties that can be described by density functional theory. One proposed approach, the van der Waals density functional (vdW-DF) method, rests on strong physical foundations and offers simple yet accurate and robust functionals. A very recent functional within this method called vdW-DF-cx [K. Berland and P. Hyldgaard, Phys. Rev. B89, 035412 (2014)] stands out in its attempt to use an exchange energy derived from the same plasmon-based theory from which the nonlocal correlation energy was derived. Encouraged by its good performance for solids, layered materials, and aromatic molecules, we apply it to several systems that are characterized by competing interactions. These include the ferroelectric response in PbTiO3, the adsorption of small molecules within metal-organic frameworks, the graphite/diamond phase transition, and the adsorption of an aromatic-molecule on the Ag(111) surface. Our results indicate that vdW-DF-cx is overall well suited to tackle these challenging systems. In addition to being a competitive density functional for sparse matter, the vdW-DF-cx construction presents a more robust general-purpose functional that could be applied to a range of materials problems with a variety of competing interactions.

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Denna post skapades 2014-07-04. Senast ändrad 2017-10-03.
CPL Pubid: 200224


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Bionanosystem (2007-2015)
Institutionen för teknisk fysik, Material- och ytteori (1900-2015)
Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik


Nanovetenskap och nanoteknik
Övrig teknisk materialvetenskap

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C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)