title: Tunable polaronic conduction in anatase TiO2.
abstract: Oxygen vacancies created in anatase TiO(2) by UV photons (80-130 eV) provide an effective electron-doping mechanism and induce a hitherto unobserved dispersive metallic state. Angle resolved photoemission reveals that the quasiparticles are large polarons. These results indicate that anatase can be tuned from an insulator to a polaron gas to a weakly correlated metal as a function of doping and clarify the nature of conductivity in this material.
authors.affiliation: Advanced Light Source (ALS), Berkeley, California 94720, USA.
authors.forename: S
authors.initials: S
authors.lastname: Moser
authors.forename: L
authors.initials: L
authors.lastname: Moreschini
authors.forename: J
authors.initials: J
authors.lastname: Jaćimović
authors.forename: O S
authors.initials: OS
authors.lastname: Barišić
authors.forename: H
authors.initials: H
authors.lastname: Berger
authors.forename: A
authors.initials: A
authors.lastname: Magrez
authors.forename: Y J
authors.initials: YJ
authors.lastname: Chang
authors.forename: K S
authors.initials: KS
authors.lastname: Kim
authors.forename: A
authors.initials: A
authors.lastname: Bostwick
authors.forename: E
authors.initials: E
authors.lastname: Rotenberg
authors.forename: L
authors.initials: L
authors.lastname: Forró
authors.forename: M
authors.initials: M
authors.lastname: Grioni