title: Creation of high mobility two-dimensional electron gases via strain induced polarization at an otherwise nonpolar complex oxide interface.
abstract: The discovery of two-dimensional electron gases (2DEGs) in SrTiO3-based heterostructures provides new opportunities for nanoelectronics. Herein, we create a new type of oxide 2DEG by the epitaxial-strain-induced polarization at an otherwise nonpolar perovskite-type interface of CaZrO3/SrTiO3. Remarkably, this heterointerface is atomically sharp and exhibits a high electron mobility exceeding 60,000 cm(2) V(-1) s(-1) at low temperatures. The 2DEG carrier density exhibits a critical dependence on the film thickness, in good agreement with the polarization induced 2DEG scheme.
authors.affiliation: Department of Energy Conversion and Storage, Technical University of Denmark , Risø Campus, 4000 Roskilde, Denmark.
authors.forename: Yunzhong
authors.initials: Y
authors.lastname: Chen
authors.forename: Felix
authors.initials: F
authors.lastname: Trier
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kasama
authors.forename: Dennis V
authors.initials: DV
authors.lastname: Christensen
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bovet
authors.forename: Zoltan I
authors.initials: ZI
authors.lastname: Balogh
authors.forename: Han
authors.initials: H
authors.lastname: Li
authors.forename: Karl Tor Sune
authors.initials: KT
authors.lastname: Thydén
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Sadegh
authors.initials: S
authors.lastname: Yazdi
authors.forename: Poul
authors.initials: P
authors.lastname: Norby
authors.forename: Nini
authors.initials: N
authors.lastname: Pryds
authors.forename: Søren
authors.initials: S
authors.lastname: Linderoth
keywords: Complex oxide interfaces; oxide electronics; strain induced polarization; two-dimensional electron gases