Hybrid-DFT + Vw method for band structure calculation of semiconducting transition metal compounds

The case of cerium dioxide

Viktor Ivády, A. Gali, Igor A. Abrikosov

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Hybrid functionals' non-local exchange-correlation potential contains a derivative discontinuity that improves on standard semi-local density functional theory (DFT) band gaps. Moreover, by careful parameterization, hybrid functionals can provide self-interaction reduced description of selected states. On the other hand, the uniform description of all the electronic states of a given system is a known drawback of these functionals that causes varying accuracy in the description of states with different degrees of localization. This limitation can be remedied by the orbital dependent exact exchange extension of hybrid functionals; the hybrid-DFT + Vw method (Ivády et al 2014 Phys. Rev. B 90 035146). Based on the analogy of quasi-particle equations and hybrid-DFT single particle equations, here we demonstrate that parameters of hybrid-DFT + Vw functional can be determined from approximate theoretical quasi-particle spectra without any fitting to experiment. The proposed method is illustrated on the charge self-consistent electronic structure calculation for cerium dioxide where itinerant valence states interact with well-localized 4f atomic like states, making this system challenging for conventional methods, either hybrid-DFT or LDA + U, and therefore allowing for a demonstration of the advantages of the proposed scheme.

Original languageEnglish
Article number454002
JournalJournal of Physics Condensed Matter
Volume29
Issue number45
DOIs
Publication statusPublished - Oct 10 2017

Fingerprint

Transition metal compounds
metal compounds
Cerium
cerium
dioxides
Band structure
Density functional theory
functionals
transition metals
density functional theory
elementary excitations
Electronic states
Parameterization
parameterization
Electronic structure
discontinuity
Energy gap
Demonstrations
ceric oxide
electronic structure

Keywords

  • hybrid functional
  • orbital dependent potential correction
  • quasi-particle equation
  • transition metal oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Hybrid-DFT + Vw method for band structure calculation of semiconducting transition metal compounds : The case of cerium dioxide. / Ivády, Viktor; Gali, A.; Abrikosov, Igor A.

In: Journal of Physics Condensed Matter, Vol. 29, No. 45, 454002, 10.10.2017.

Research output: Contribution to journalArticle

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