title: Coherent and Incoherent Excitations of Electron-Doped SrTiO3.
abstract: Resonant photoemission at the Ti 2p and O 1s edges on a Nb-doped SrTiO(3) thin film revealed that the coherent state (CS) at the Fermi level (E(F)) had a mainly Ti 3d character whereas the incoherent in-gap state (IGS) positioned approximately 1.5 eV below E(F) 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.
authors: RIKEN SPring-8 Center, Sayo, Sayo, Hyogo 679-5148, Japan.
authors: Yukiaki
authors: Y
authors: Ishida
authors: Ritsuko
authors: R
authors: Eguchi
authors: Masaharu
authors: M
authors: Matsunami
authors: Koji
authors: K
authors: Horiba
authors: Munetaka
authors: M
authors: Taguchi
authors: Ashish
authors: A
authors: Chainani
authors: Yasunori
authors: Y
authors: Senba
authors: Haruhiko
authors: H
authors: Ohashi
authors: Hiromichi
authors: H
authors: Ohta
authors: Shik
authors: S
authors: Shin