Electronic and optical properties of anatase TiO2

R. Asahi*, Y. Taga, W. Mannstadt, A. J. Freeman

*Corresponding author for this work

Research output: Contribution to journalArticle

630 Scopus citations

Abstract

First-principles calculations using the full-potential linearized augmented plane-wave method have been performed to investigate detailed electronic and optical properties of TiO2 in the anatase structure. The fully optimized structure, obtained by minimizing the total energy and atomic forces, are in good agreement with experiment. Stabilization of the structure by the trade off between a favorable coordination in the sp2 hybridization and the Coulomb repulsion among oxygen atoms is also demonstrated. We calculate band structure, densities of states and charge densities, and interpret their features in terms of the bonding structure in the molecular orbital picture. The optical properties, calculated within the dipole approximation, are found to agree with recent experiments on single crystals of anatase TiO2. Near the absorption edge, the results show a significant optical anisotropy in the components parallel and perpendicular to the c axis. We demonstrate that this large dichroism results from the existence of nonbonding dxy orbitals located at the bottom of the conduction bands, which allows direct dipole transitions dominantly for the perpendicular component.

Original languageEnglish
Pages (from-to)7459-7465
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number11
StatePublished - 2000

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Asahi, R., Taga, Y., Mannstadt, W., & Freeman, A. J. (2000). Electronic and optical properties of anatase TiO2 Physical Review B - Condensed Matter and Materials Physics, 61(11), 7459-7465.