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

doi:10.1103/PhysRevLett.100.056401

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

93 Citations (Scopus)

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 language	English
Article number	056401
Journal	Physical review letters
Volume	100
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.100.056401
Publication status	Published - 2008 Feb 4

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.100.056401

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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.",

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T1 - Coherent and incoherent excitations of electron-doped SrTiO3

AU - Ishida, Yukiaki

AU - Eguchi, Ritsuko

AU - Matsunami, Masaharu

AU - Horiba, Koji

AU - Taguchi, Munetaka

AU - Chainani, Ashish

AU - Senba, Yasunori

AU - Ohashi, Haruhiko

AU - Ohta, Hiromichi

AU - Shin, Shik

PY - 2008/2/4

Y1 - 2008/2/4

N2 - 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.

AB - 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.

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Coherent and incoherent excitations of electron-doped SrTiO3

Abstract

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