• InSb
• Josephson Junction
• SQUID
• Superconductivity

In mesoscopic physics, interference effects play a relevant role in determining the behavior and the transport properties of quantum devices. Among all, interference phenomena are of particular importance in the context of superconducting systems. Indeed, superconducting quantum interference devices, known as SQUIDs, have found several applications in magnetometry, scanning probe microscopies, and more recently quantum computing. Besides, SQUIDs in the strongly asymmetric geometry are useful to investigate fundamental properties of Josephson junctions, for instance to extract the Current Phase Relationship (CPR).

In this master thesis, we report the first fabrication and characterization of SQUIDs made with InSb nanoflag-based Josephson junctions. The two arms of the SQUIDs are composed of two superconducting-normal-superconducting junctions, where the normal part is a single InSb nanoflag, a semiconductor with strong spin-orbit coupling with quasi-2D electronic transport. Making use of the elongated shape of the nanoflags, both symmetric and asymmetric SQUID geometries are realized. Characterization at low temperature is performed by magneto transport measurements, showing supercurrent interference for various values of temperature and back gate.