Josephson junctions and superconducting quantum interference devices with graphene or other 2D materials as the weak link between superconductors have become a hot topic of research in recent years, with respect to both fundamental physics and potential applications.
Researchers at Aalto University have yet reported ltrawide Josephson junctions (up to 80 μm wide) based on chemical-vapor-deposition graphene where the critical current was found to be uniformly distributed in the direction perpendicular to the current. They now demonstrate that the unusually large Josephson penetration depth λJ that this corresponds to is enabled by the unique geometric structure of Josephson junctions based on 2D materials. (Journal of Applied Physics)