Coherent and incoherent excitations of electron-doped SrTiO3

Yukiaki Ishida, Ritsuko Eguchi, Masaharu Matsunami, Koji Horiba, Munetaka Taguchi, Ashish Chainani, Yasunori Senba, Haruhiko Ohashi, Hiromichi Ohta, Shik Shin

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Abstract

Resonant photoemission at the Ti 2p and O 1s edges on a Nb-doped SrTiO3 thin film revealed that the coherent state (CS) at the Fermi level (EF) had a mainly Ti 3d character whereas the incoherent in-gap state (IGS) positioned ∼1.5eV below EF had a mixed character of Ti 3d and O 2p states. This indicates that the IGS is formed by a spectral-weight transfer from the CS and subsequent spectral-weight redistribution through d-p hybridization. We discuss the evolution of the excitation spectrum with 3d band filling and rationalize the IGS through a mechanism similar to that proposed by Haldane and Anderson.

Original languageEnglish
Article number056401
JournalPhysical Review Letters
Volume100
Issue number5
DOIs
Publication statusPublished - Feb 4 2008
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Ishida, Y., Eguchi, R., Matsunami, M., Horiba, K., Taguchi, M., Chainani, A., Senba, Y., Ohashi, H., Ohta, H., & Shin, S. (2008). Coherent and incoherent excitations of electron-doped SrTiO3. Physical Review Letters, 100(5), [056401]. https://doi.org/10.1103/PhysRevLett.100.056401