Coherent and Incoherent States of Electron-doped SrTiO3

Details Coherent and Incoherent States of Electron-doped SrTiO3 Coherent and Incoherent States of Electron-doped SrTiO3

2007-12-19

arxiv.org/abs/0712.3083v1

Phys. Rev. Lett. 100, 056401 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.100.056401

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 mainly Ti 3d character whereas the incoherent in-gap state (IGS) positioned ~1.5 eV below EF had 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.

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