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Unveiling the Current-Phase Relationship of InSb Nanoflag Josephson Junctions Using a NanoSQUID Magnetometer.
Andrea Chieppa1, Gaurav Shukla1, Simone Traverso2,3
1NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy.
Nano Letters
|September 10, 2025
Summary
Researchers fabricated superconducting quantum interference devices (SQUIDs) using Indium Antimonide (InSb) nanoflag Josephson junctions (JJs). They revealed detailed current-phase relationships (CPRs) and demonstrated potential for nanoscale magnetometry.
Area of Science:
- Superconducting electronics
- Condensed matter physics
- Nanotechnology
Background:
- Planar Josephson junctions (JJs) based on Indium Antimonide (InSb) nanoflags are a novel platform in superconducting electronics.
- Understanding the current-phase relationship (CPR) of these hybrid junctions is essential for their technological applications.
Purpose of the Study:
- To fabricate and investigate superconducting quantum interference devices (SQUIDs) utilizing InSb nanoflag JJs.
- To extract detailed CPR information and assess the performance of these devices as magnetometers.
Main Methods:
- Fabrication of SQUIDs with InSb nanoflag JJs.
- Measurement of interference patterns in symmetric and asymmetric SQUID configurations.
- Numerical simulations to reproduce observed features.
- Magnetic field response exploration and flux-to-voltage sensitivity assessment.
Main Results:
- The study successfully fabricated and characterized SQUIDs with InSb nanoflag JJs.
- Detailed CPRs were extracted, revealing skewness and higher harmonic contributions.
- A magnetic flux noise of 4.4 × 10⁻⁶ Φ₀/√Hz was identified.
Conclusions:
- The results demonstrate the potential of InSb nanoflag JJs for advanced superconducting electronics.
- These devices show promise for high-sensitivity nanoscale magnetometry applications.
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