Masters defense: James Mingchi Xu

Superconductor Double Nanowire Interference Device

This project aims to build a Superconducting Quantum Interference Device (SQUID) with high Bc superconducting material (ReMo) based on InAs/Al parallel double nanowire. We explored the 0−π transition in the intrinsic phase shift of the Josephson junction’s current phase relation. We also characterized the basic functionality of the SQUID, including the double quantum dot feature of the double nanowire, the superconductivity features, and the RCSJ model of the device. In this thesis, we also discuss the fabrication process and the measurement setup in detail. A fast new method of measuring the critical current of a Josephson junction is presented.

Aside from the SQUID experiment, we also explored the fabrication process of a double nanowire superconducting island device made with the InAs/Al Selected Area Growth (SAG) platform. The basic characterization of such a system was performed, focusing on the charging energy of the metallic island and verifying its superconductivity.