Side gate tunable Josephson junctions at the LaAlO${}_3$/SrTiO${}_3$ interface

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 LaAlO${}_3$/SrTiO${}_3$ 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.

7 pages, 5 figures

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Cited by in corpus (16)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• One-Dimensional Nature of Pairing and Superconductivity at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Superconducting quantum point contact with split gates in the two dimensional LaAlO3/SrTiO3 superfluid
• Full electrostatic control of quantum interference in an extended trenched Josephson junction
• rf-SQUID measurements of anomalous Josephson effect
• Quantum paraelectricity probed by superconducting resonators
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTiO3 Revealed by an Interfacial Waveguide Resonator
• Band offsets at amorphous-crystalline $A{l}_2{O}_3-SrTi{O}_3$ oxide interfaces
• Evidence of Josephson coupling in a few-layer black phosphorus planar Josephson junction
• Nanoscale tunnel field effect transistor based on a complex oxide lateral heterostructure
• Local tuning of the order parameter in superconducting weak links: A zero-inductance nano device
• Electronic transport in sub-micrometric channels at the LaAlO${}_3$/SrTiO${}_3$ interface
• First-principles design of ferromagnetic monolayer MnO${}_2$ at the complex interface
• Mixed superconducting state without applied magnetic field
• Oxide Interface-Based Polymorphic Electronic Devices for Neuromorphic Computing