title: Role of percolation in the conductance of electrolyte-gated SrTiO3.
abstract: We study the electrolyte-gate-induced conductance at the surface of SrTiO(3)(001). We find two distinct transport regimes as a function of gate voltage. At high carrier densities, a percolative metallic state is induced in which, at low temperatures, clear signatures of a Kondo effect are observed. At lower carrier densities, the resistance diverges at low temperatures and can be well described by a 2D variable range hopping model. We postulate that this derives from nonpercolative transport due to inhomogeneous electric fields from imperfectly ordered ions at the electrolyte-oxide interface.
authors.affiliation: IBM Almaden Research Center, San Jose, California, USA.
authors.forename: Mingyang
authors.initials: M
authors.lastname: Li
authors.forename: Tanja
authors.initials: T
authors.lastname: Graf
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Schladt
authors.forename: Xin
authors.initials: X
authors.lastname: Jiang
authors.forename: Stuart S P
authors.initials: SS
authors.lastname: Parkin