title: Tailoring LaAlO3/SrTiO3 Interface Metallicity by Oxygen Surface Adsorbates.
abstract: We report an oxygen surface adsorbates induced metal-insulator transition at the LaAlO3/SrTiO3 interfaces. The observed effects were attributed to the terminations of surface Al sites and the resultant electron-accepting surface states. By controlling the local oxygen adsorptions, we successfully demonstrated the nondestructive patterning of the interface two-dimensional electron gas (2DEG). The obtained 2DEG structures are stable in air and also robust against general solvent treatments. This study provides new insights into the metal-insulator transition mechanism at the complex oxide interfaces and also a highly efficient technique for tailoring the interface properties.
authors.affiliation: Department of Physics and Astronomy, West Virginia University , Morgantown, West Virginia 26506, United States.
authors.forename: Weitao
authors.initials: W
authors.lastname: Dai
authors.affiliation: Department of Physics and Astronomy, West Virginia University , Morgantown, West Virginia 26506, United States.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Adhikari
authors.affiliation: Physique Théorique des Matériaux, Université de Liège , B-4000 Sart-Tilman, Belgium.|Centro de Investigación y Estudios Avanzados del IPN , MX-76230 Querétaro, México.
authors.forename: Andrés Camilo
authors.initials: AC
authors.lastname: Garcia-Castro
authors.affiliation: Department of Physics and Astronomy, West Virginia University , Morgantown, West Virginia 26506, United States.
authors.forename: Aldo H
authors.initials: AH
authors.lastname: Romero
authors.affiliation: Department of Material Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Hyungwoo
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Material Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Jung-Woo
authors.initials: JW
authors.lastname: Lee
authors.affiliation: Department of Material Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Sangwoo
authors.initials: S
authors.lastname: Ryu
authors.affiliation: Department of Material Science and Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Chang-Beom
authors.initials: CB
authors.lastname: Eom
authors.affiliation: Department of Physics and Astronomy, West Virginia University , Morgantown, West Virginia 26506, United States.
authors.forename: Cheng
authors.initials: C
authors.lastname: Cen
keywords: 2DEG; adsorbates; charge transfer doping; oxide interfaces; surface states