Josephson effect and triplet-singlet ratio of noncentrosymmetric superconductors

Ludwig Klam; Anthony Epp; Wei Chen; Manfred Sigrist; Dirk Manske

doi:10.1103/PhysRevB.89.174505

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Josephson effect and triplet-singlet ratio of noncentrosymmetric superconductors

Ludwig Klam, Anthony Epp, Wei Chen, Manfred Sigrist, Dirk Manske

DOI 10.1103/PhysRevB.89.174505 · Physical Review B

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Abstract

We calculate the Andreev bound states and the corresponding Josephson current for an asymmetric two-dimensional Josephson junction by solving Bogoliubov–de Gennes equations. The junction consists of a noncentrosymmetric superconductor (NCS) separated by a tunneling barrier with a variable height to a conventional s-wave superconductor. In addition to the antisymmetric spin-orbit coupling in the NCS on the one side, this asymmetric junction gives rise to a Rashba spin-orbit coupling at the interface. We explore the rich parameter space and recover various limiting cases such as s-wave/p-wave junction and the asymmetric s-wave junctions. In addition, we report a transition from a 0 junction to a π/2 junction with increasing triplet-singlet pairing ratio of the NCS, which serves as a mechanism to determine the unknown ratio in a variety of NCS's.