Momentum-transfer-resolved electron energy loss spectroscopy of BaBiO3: Anisotropic dispersion of threshold excitation and optically forbidden transition

Y. Y. Wang*, Vinayak P Dravid, N. Bulut, P. D. Han, M. V. Klein, S. E. Schnatterly, F. C. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Momentum-transfer-resolved electron energy loss spectroscopy of the valence band transitions in BaBiO3 has revealed for the first time that dispersion of the excitation at the optical gap (∼2 eV) and an optically forbidden transition at 4.5 eV are all anisotropic along [100] and [110]. The anisotropic dispersion of the threshold excitation cannot be described by a simple charge density wave picture but can be explained by a small exciton model proposed in this paper. The optically forbidden transition is found to agree well with a proposed molecular orbital model, where the transition is assigned as the excitation from the O 2pσ nonbonding states to the empty Bi 6s state.

Original languageEnglish (US)
Pages (from-to)2546-2549
Number of pages4
JournalPhysical review letters
Volume75
Issue number13
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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