title: Side Gate Tunable Josephson Junctions at the LaAlO3/SrTiO3Interface.
abstract: Novel physical phenomena arising at the interface of complex oxide heterostructures offer exciting opportunities for the development of future electronic devices. Using the prototypical LaAlO3/SrTiO3interface as a model system, we employ a single-step lithographic process to realize gate-tunable Josephson junctions through a combination of lateral confinement and local side gating. The action of the side gates is found to be comparable to that of a local back gate, constituting a robust and efficient way to control the properties of the interface at the nanoscale. We demonstrate that the side gates enable reliable tuning of both the normal-state resistance and the critical (Josephson) current of the constrictions. The conductance and Josephson current show mesoscopic fluctuations as a function of the applied side gate voltage, and the analysis of their amplitude enables the extraction of the phase coherence and thermal lengths. Finally, we realize a superconducting quantum interference device in which the critical currents of each of the constriction-type Josephson junctions can be controlled independently via the side gates.
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: A M R V L
authors.identifier: 0000-0002-9380-9401
authors.initials: AM
authors.lastname: Monteiro
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: D J
authors.identifier: 0000-0002-0967-1375
authors.initials: DJ
authors.lastname: Groenendijk
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: N
authors.identifier: 0000-0002-7768-2500
authors.initials: N
authors.lastname: Manca
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: E
authors.identifier: 0000-0002-3881-6625
authors.initials: E
authors.lastname: Mulazimoglu
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Goswami
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: Ya
authors.initials: Y
authors.lastname: Blanter
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: L M K
authors.initials: LM
authors.lastname: Vandersypen
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology , P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: A D
authors.initials: AD
authors.lastname: Caviglia
keywords: Josephson junction; Oxide heterostructures; SQUID; field-effect; side gates