Phys. Rev. Lett. 100, 056401 (2008) [4 pages]Coherent and Incoherent Excitations of Electron-Doped SrTiO3Received 19 February 2007; published 4 February 2008 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 ∼1.5 eV 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.056401
DOI:
10.1103/PhysRevLett.100.056401
PACS:
71.28.+d, 71.10.−w, 79.60.−i
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