Tight-binding study of bilayer graphene Josephson junctions

Abstract

Using highly efficient simulations of the tight-binding Bogoliubov--de-Gennes model, we solved self-consistently for the pair correlation and the Josephson current in a superconducting-bilayer graphene--superconducting Josephson junction. Different doping levels for the non-superconducting link are considered in the short- and long-junction regimes. Self-consistent results for the pair correlation and superconducting current resemble those reported previously for single-layer graphene except at the Dirac point, where remarkable differences in the proximity effect are found, as well as a suppression of the superconducting current in the long-junction regime. Inversion symmetry is broken by considering a potential difference between the layers and we found that the supercurrent can be switched if the junction length is larger than the Fermi length.