Local Control of Supercurrent Density in Epitaxial Planar Josephson Junctions

Abstract

The critical current response to an applied out-of-plane magnetic field in a Josephson junction provides insight into the uniformity of its current distribution. In Josephson junctions with semiconducting weak links, the carrier density and, therefore the overall current distribution could be modified electrostatically via metallic gates. Here, we show local control of the current distribution in an epitaxial Al-InAs Josephson junction equipped with five mini-gates. We demonstrate that not only can the junction width be electrostatically defined but also we can locally adjust the current profile to form superconducting quantum interference devices. Our studies show enhanced edge conduction in such long junctions, which can be eliminated by mini-gates to create a uniform current distribution.

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• Superconducting resonators with voltage-controlled frequency and nonlinearity
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• Evolution of $4\pi$-periodic Supercurrent in the Presence of In-plane Magnetic Field
• Tunable Capacitor For Superconducting Qubits Using an InAs/InGaAs Heterostructure
• Beyond the effective length: How to analyze magnetic interference patterns of thin-film planar Josephson junctions with finite lateral dimensions
• Anomalous periodicity and parafermion hybridization in superconducting qubits
• The study of contact properties in edge-contacted graphene-aluminum Josephson junctions
• Protected hybrid superconducting qubit in an array of gate-tunable Josephson interferometers