Scanning gate microscopy modulation of supercurrent in graphene Josephson junctions

Graphene Josephson junctions (JJs) represent an excellent platform for quantum technologies, thanks to the combination of high carrier mobility, ballistic transport, and gate-tunable critical currents, preserved even under quantizing magnetic fields. Investigating the spatial distribution of supercurrent flow could be crucial for elucidating transport mechanisms and advancing the engineering of these devices. In this work, we employ a scanning gate microscope to investigate supercurrent transport in hexagonal boron nitride-encapsulated graphene JJs. We study the supercurrent modulation as a function of tip voltage bias and tip-to-sample distance and provide a complete characterization of the tip-induced modulation. Our experimental results are quantitatively consistent with numerical simulations and pave the way toward local mapping and manipulation of gate-tunable superconducting phenomena with unprecedented spatial resolution.