Abstract
Resonant photoemission at the Ti and O edges on a Nb-doped thin film revealed that the coherent state (CS) at the Fermi level () had a mainly Ti character whereas the incoherent in-gap state (IGS) positioned below had a mixed character of Ti and O states. This indicates that the IGS is formed by a spectral-weight transfer from the CS and subsequent spectral-weight redistribution through hybridization. We discuss the evolution of the excitation spectrum with band filling and rationalize the IGS through a mechanism similar to that proposed by Haldane and Anderson.
- Received 19 February 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.056401
©2008 American Physical Society