Spin-projected charge conductance in SNN junctions with noncentrosymmetric superconductors

A superconductor-normal-metal-normal-metal junction in which the superconducting potential is a mixture between s-wave and p-wave potentials is investigated using the Usadel equation equipped with Tanaka-Nazarov boundary conditions. This Research Letter provides several ways to distinguish between s-wave+chiral p-wave superconductors and s-wave+helical p-wave superconductors and a way to determine whether a superconductor has a mixed pair potential. Thus it is of great importance in the determination of the pair potential of super-conductors. It is shown that the different spin sectors satisfy independent equations and can thus be calculated separately even if the d vector depends on the direction of momentum. This greatly simplifies the equations to be solved. It was found that a difference in conductance for sectors with opposite spins arises if both an s-wave component and a p-wave component are present, even in the absence of a magnetic field. It is shown that the spin-projected charge conductance for s-wave + chiral p-wave junctions and s-wave + helical p-wave junctions is qualitatively similar. A setup containing two superconductor-normal-metal junctions is shown to give a clear difference between the two types of superconductivity.