Structural, vibrational, and quasiparticle properties of the Peierls semiconductor BaBiO3: A hybrid functional and self-consistent GW + vertex-corrections study

Cesare Franchini, Antonio Sanna, Martijn Marsman, Georg Kresse

Publications: Contribution to journalArticlePeer Reviewed

Abstract

BaBiO3 is characterized by a charge disproportionation with half of the Bi atoms possessing a valence 3+ and half a valence 5+. Because of self-interaction errors, local- and semilocal-density functionals fail to describe the charge disproportionation quantitatively, yielding a too small structural distortion and no band gap. Using hybrid functionals, we obtain a satisfactory description of the structural, electronic, optical, and vibrational properties of BaBiO3. The results obtained using GW (Green's function G and screened Coulomb potential W) based schemes on top of hybrid functionals, including fully self-consistent GW calculations with vertex corrections in the dielectric screening, qualitatively confirm the Heyd-Scuseria-Ernzerhof picture but a systematic overestimation of the band gap by about 0.4 eV is observed.
Original languageEnglish
Article number085213
Number of pages7
JournalPhysical Review B
Volume81
Issue number8
DOIs
Publication statusPublished - 2010

Austrian Fields of Science 2012

  • 103018 Materials physics

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