Current-phase Relationship, Thermal and Quantum Phase Slips in Superconducting Nanowires made on Scaffold Created using Adhesive Tape

TL;DR

This study investigates the current-phase relationship and phase slip phenomena in superconducting nanowires fabricated using an innovative adhesive tape method, providing insights into their microwave response and quantum behavior.

Contribution

It introduces a simple fabrication technique for superconducting nanowires and analyzes their microwave response to understand classical and quantum phase slips.

Findings

Demonstrated a fabrication method using adhesive tape for superconducting nanowires.

Compared resistance-temperature behavior of MoGe and Al nanowires with theoretical models.

Modeled microwave response using generalized McCumber-Stewart model for classical and quantum CPR.

Abstract

Quantum phase slippage (QPS) in a superconducting nanowire is a new candidate for developing a quantum bit. It has also been theoretically predicted that the occurrence of QPS significantly changes the current-phase relationship (CPR) of the wire due to the tunneling between topologically different metastable states. We present studies on the microwave response of the superconducting nanowires to reveal their CPRs. First, we demonstrate a simple nanowire fabrication technique, based on commercially available adhesive tapes, which allows making thin superconducting wire from different metals. We compare the resistance vs. temperature curves of Mo$_{76}$Ge$_{24}$ and Al nanowires to the classical and quantum models of phase slips. In order to describe the experimentally observed microwave responses of these nanowires, we use the McCumber-Stewart model, which is generalized to include either classical or quantum CPR.