title: Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces.
abstract: We report on a study of magnetotransport in LaAlO3 /SrTiO3 interfaces characterized by mobilities of the order of several thousands cm2/V s. We observe Shubnikov-de Haas oscillations whose period depends only on the perpendicular component of the magnetic field. This observation directly indicates the formation of a two-dimensional electron gas originating from quantum confinement at the interface. From the temperature dependence of the oscillation amplitude we extract an effective carrier mass m* ≃ 1.45 m(e). An electric field applied in the back-gate geometry increases the mobility, the carrier density, and the oscillation frequency.
authors.affiliation: Département de Physique de la Matière Condensée, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland.
authors.forename: A D
authors.initials: AD
authors.lastname: Caviglia
authors.forename: S
authors.initials: S
authors.lastname: Gariglio
authors.forename: C
authors.initials: C
authors.lastname: Cancellieri
authors.forename: B
authors.initials: B
authors.lastname: Sacépé
authors.forename: A
authors.initials: A
authors.lastname: Fête
authors.forename: N
authors.initials: N
authors.lastname: Reyren
authors.forename: M
authors.initials: M
authors.lastname: Gabay
authors.forename: A F
authors.initials: AF
authors.lastname: Morpurgo
authors.forename: J-M
authors.initials: JM
authors.lastname: Triscone