InSb nanoflags represent an interesting platform for quantum transport and have recently been exploited in the study of hybrid planar Josephson junctions. Due to the uncovered semiconductor surface, they are also good candidates for surface probe techniques. Here, we report the first Scanning Gate Microscopy (SGM) experiments on Nb-contacted InSb nanoflag-based Josephson junctions. In the normal state, sizable conductance modulation via the charged tip of the SGM is recorded. In the superconducting state, we report the first application of Scanning Gate Microscopy to superconducting weak links, demonstrating the possibility of manipulating the supercurrent flow across a semiconductor-superconductor heterostructure at a local level. The experimental findings are consistent with theoretical predictions and establish a new way of investigating the behavior of superconducting weak links, towards the local imaging of supercurrent flow.
@article{arxiv.2506.15342,
title = {Supercurrent modulation in InSb nanoflag-based Josephson junctions by scanning gate microscopy},
author = {Antonio Lombardi and Gaurav Shukla and Giada Bucci and Sedighe Salimian and Valentina Zannier and Simone Traverso and Samuele Fracassi and Niccolo Traverso Ziani and Maura Sassetti and Matteo Carrega and Fabio Beltram and Lucia Sorba and Stefan Heun},
journal= {arXiv preprint arXiv:2506.15342},
year = {2025}
}