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Side Gate Tunable Josephson Junctions at the LaAlO3/SrTiO3 Interface

Journal Article (2017)
Author(s)

Mafalda RinconVieiraLugarinhoMonteiro (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)

D. J. Groenendijk (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)

N. Manca (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)

E. Mulazimoglu (Kavli institute of nanoscience Delft, TU Delft - Applied Sciences)

S. Goswami (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)

Yaroslav Blanter (Kavli institute of nanoscience Delft, TU Delft - Applied Sciences)

L. M K Vandersypen (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)

A. D. Caviglia (Kavli institute of nanoscience Delft, TU Delft - Applied Sciences)

Research Group
QN/Caviglia Lab
DOI related publication
https://doi.org/10.1021/acs.nanolett.6b03820 Final published version
More Info
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Publication Year
2017
Language
English
Research Group
QN/Caviglia Lab
Issue number
2
Volume number
17
Pages (from-to)
715-720
Downloads counter
264
Collections
Institutional Repository
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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/SrTiO3 interface 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.