title: Hydrogen-induced surface metallization of SrTiO3(001).
abstract: Surface metallization of SrTiO3(001) by hydrogen adsorption is experimentally confirmed for the first time by photoemission spectroscopy and surface conductivity measurements. The metallic state is assigned to a quantized state in the space-charge layer induced by electron doping from hydrogen atoms. The measured two-dimensional (2D) conductivity is well above the 2D Ioffe-Regel limit indicating that the system is in a metallic conduction regime. The mean free path of the surface electron is estimated to be several nanometers at room temperature.
authors.affiliation: Institut des Nanosciences de Paris, Université Pierre et Marie Curie-Paris 6, CNRS-UMR 7588, Paris, France. dangelo@insp.jussieu.fr
authors.forename: M
authors.initials: M
authors.lastname: D'Angelo
authors.forename: R
authors.initials: R
authors.lastname: Yukawa
authors.forename: K
authors.initials: K
authors.lastname: Ozawa
authors.forename: S
authors.initials: S
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Hirahara
authors.forename: S
authors.initials: S
authors.lastname: Hasegawa
authors.forename: M G
authors.initials: MG
authors.lastname: Silly
authors.forename: F
authors.initials: F
authors.lastname: Sirotti
authors.forename: I
authors.initials: I
authors.lastname: Matsuda