The study of contact properties in edge-contacted graphene-aluminum Josephson junctions

TL;DR

This paper investigates how the edge-contact fabrication process affects the transparency of aluminum-graphene Josephson junctions, demonstrating improved contact quality crucial for superconducting quantum devices.

Contribution

It introduces a modified etch process that significantly enhances contact transparency in edge-contacted superconductor-graphene junctions.

Findings

Enhanced junction transparency with the new etch process

Comparison shows superior performance to existing graphene Josephson junctions

Advances understanding of fabrication techniques for superconductor-graphene interfaces

Abstract

Transparent contact interfaces in superconductor-graphene hybrid systems are critical for realizing superconducting quantum applications. Here, we examine the effect of the edge-contact fabrication process on the transparency of the superconducting aluminum-graphene junction. We show significant improvement in the transparency of our superconductor-graphene junctions by promoting the chemical component of the edge contact etch process. Our results compare favorably with state-of-the-art graphene Josephson junctions. The findings of our study contribute to advancing the fabrication knowledge of edge-contacted superconductor-graphene junctions.