# Tailoring supercurrent confinement in graphene bilayer weak links

## TL;DR

This paper demonstrates how local gating in bilayer graphene heterostructures can precisely control supercurrent confinement and amplitude, enabling the development of highly tunable superconducting weak links for advanced quantum devices.

## Contribution

It introduces a method to control supercurrent properties in graphene-based weak links using local gates, combining experimental and theoretical approaches.

## Key findings

- Achieved spatial and amplitude control of supercurrent in graphene heterostructures.
- Demonstrated tunability of superconducting weak links via local gating.
- Enabled design of complex superconducting circuits like interferometers.

## Abstract

The Josephson effect is one of the most studied macroscopic quantum phenomena in condensed matter physics and has been an essential part of the quantum technologies development over the last decades. It is already used in many applications such as magnetometry, metrology, quantum computing, detectors or electronic refrigeration. However, developing devices in which the induced superconductivity can be monitored, both spatially and in its magnitude, remains a serious challenge. In this work, we have used local gates to control confinement, amplitude and density profile of the supercurrent induced in one-dimensional nanoscale constrictions, defined in bilayer graphene-hexagonal boron nitride van der Waals heterostructures. The combination of resistance gate maps, out-of-equilibrium transport, magnetic interferometry measurements, analytical and numerical modelling enables us to explore highly tunable superconducting weak links. Our study opens the path way to design more complex superconducting circuits based on this principle such as electronic interferometers or transition-edge sensors.