Strong excitonic interactions in the oxygen K-edge of perovskite oxides

Kota Tomita, Tomohiro Miyata, Weine Olovsson, Teruyasu Mizoguchi

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Excitonic interactions of the oxygen K-edge electron energy-loss near-edge structure (ELNES) of perovskite oxides, CaTiO 3 , SrTiO 3 , and BaTiO 3 , together with reference oxides, MgO, CaO, SrO, BaO, and TiO 2 , were investigated using a first-principles Bethe–Salpeter equation calculation. Although the transition energy of oxygen K-edge is high, strong excitonic interactions were present in the oxygen K-edge ELNES of the perovskite oxides, whereas the excitonic interactions were negligible in the oxygen K-edge ELNES of the reference compounds. Detailed investigation of the electronic structure suggests that the strong excitonic interaction in the oxygen K-edge ELNES of the perovskite oxides is caused by the directionally confined, low-dimensional electronic structure at the Ti–O–Ti bonds.

Original languageEnglish
Pages (from-to)105-111
Number of pages7
JournalUltramicroscopy
Volume178
DOIs
Publication statusPublished - 2017 Jul 1
Externally publishedYes

Keywords

  • Electron energy-loss near-edge structure
  • Exciton
  • First principles calculation
  • Oxygen K-edge
  • Perovskite oxides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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