Superconducting Quantum Interference Devices based on InSb nanoflag Josephson junctions

Abstract

Planar Josephson junctions (JJs) based on InSb nanoflags have recently emerged as an intriguing platform in superconducting electronics. This letter presents the fabrication and investigation of superconducting quantum interference devices (SQUIDs) employing InSb nanoflag JJs. We provide measurements of interference patterns in both symmetric and asymmetric geometries. The interference patterns in both configurations can be modulated by a back-gate voltage, a feature well reproduced through numerical simulations. The observed behavior aligns with the skewed current-phase relations of the JJs, demonstrating significant contributions from higher harmonics. We explore the magnetic field response of the devices across a wide range of fields ($\pm 30$ mT), up to the single-junction interference regime, where a Fraunhofer-like pattern is detected. Finally, we assess the flux-to-voltage sensitivity of the SQUIDs to evaluate their performance as magnetometers. A magnetic flux noise of $S_{\Phi }^{1/2}=4.4\times 10^{-6}{\Phi }_0/\sqrt{Hz}$ is identified, indicating potential applications in nanoscale magnetometry.

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Cited by in corpus (4)

• Supercurrent modulation in InSb nanoflag-based Josephson junctions by scanning gate microscopy
• Spin splitting, Kondo correlation and singlet-doublet quantum phase transition in a superconductor-coupled InSb nanosheet quantum dot
• Vortex Pinning in Niobium covered by a thin polycrystalline Gold
• Signatures of Majorana bound states in scanning gate microscopy of hybrid nanowires