title: Stabilizing Single Ni Adatoms on a Two-Dimensional Porous Titania Overlayer at the SrTiO3(110) Surface.
abstract: Nickel vapor-deposited on the SrTiO3(110) surface was studied using scanning tunneling microscopy, photoemission spectroscopy (PES), and density functional theory calculations. This surface forms a (4 × 1) reconstruction, composed of a 2-D titania structure with periodic six- and ten-membered nanopores. Anchored at these nanopores, Ni single adatoms are stabilized at room temperature. PES measurements show that the Ni adatoms create an in-gap state located at 1.9 eV below the conduction band minimum and induce an upward band bending. Both experimental and theoretical results suggest that Ni adatoms are positively charged. Our study produces well-dispersed single-adatom arrays on a well-characterized oxide support, providing a model system to investigate single-adatom catalytic and magnetic properties.
authors.affiliation: Institute of Applied Physics, Vienna University of Technology , Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Institute of Applied Physics, Vienna University of Technology , Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Hao
authors.affiliation: Institute of Applied Physics, Vienna University of Technology , Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Gerhold
authors.affiliation: Institute of Applied Physics, Vienna University of Technology , Wiedner Hauptstraße 8-10, 1040 Vienna, Austria ; CEITEC BUT , Technicka 10, 61669 Brno, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Mares
authors.affiliation: Institute of Applied Physics, Vienna University of Technology , Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Margareta
authors.initials: M
authors.lastname: Wagner
authors.affiliation: Institute of Applied Physics, Vienna University of Technology , Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Roland
authors.initials: R
authors.lastname: Bliem
authors.affiliation: MAX IV Laboratory, Lund University , Ole Römers väg 1, 223 63 Lund, Sweden.
authors.forename: Karina
authors.initials: K
authors.lastname: Schulte
authors.affiliation: Institute of Applied Physics, Vienna University of Technology , Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Michael
authors.initials: M
authors.lastname: Schmid
authors.affiliation: Faculty of Physics and Center for Computational Materials Science, University of Vienna , Sensengasse 8/12, 1090 Vienna, Austria.
authors.forename: Cesare
authors.initials: C
authors.lastname: Franchini
authors.affiliation: Institute of Applied Physics, Vienna University of Technology , Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Ulrike
authors.initials: U
authors.lastname: Diebold