Josephson effect between conventional and non-centrosymmetric superconductors Original Research Article

We analyze the Josephson effect between a conventional and a non-centrosymmetric superconductor to examine characteristic features of such junctions and the symmetry of the superconducting phases. As a concrete example, we consider the non-centrosymmetric superconductor CePt3Si where Rashba spin–orbit coupling plays a crucial role and affects the Josephson pair tunneling. In this case, the Josephson coupling is composed of two parts, spin-singlet-like and spin-triplet-like components. The triplet-like component can lead to a Josephson coupling shifted by ππ relative to the singlet-like coupling. This has important implications on the interference effects and may explain some recent experimental results for the Al/CePt3Si junction.