Towards Perfect Andreev Reflection in Graphene-NbSe₂ planar Josephson Junctions

Several theoretical proposals suggest that combining 2D superconductors with 2D semiconductors could provide a rich platform to study novel quantum phases such as Majorana zero modes — fractional quasiparticles localized at boundaries of topological superconductors. However, interfacing these two phenomena with high interfacial transparency remains a longstanding challenge. The rapidly growing catalogue of 2D Van der Waals materials provides a platform for making atomically clean interfaces between materials with a variety of properties. In this talk I will present newly developed techniques to assemble NbSe₂-graphene Josephson junctions such that we simultaneously improve the junction transparency while also maintaining high mobility in the graphene channel. Transparent graphene-NbSe₂ contacts as a platform to explore planar topological Josephson junctions will be discussed.