Theory of tunneling conductance in normal metal/triplet superconductor junctions without inversion symmetry

We study tunneling conductance in normal metal/triplet superconductor junctions without inversion symmetry by solving the Bogoliubov-de Gennes equation. We consider a pairing symmetry, d(k)∝x-circumflex ky-y-circumflex kx. The effect of Rashba spin-orbit coupling (RSOC) is taken into account. We find that the RSOC induces a peak at the energy gap like s-wave superconductors in the tunneling spectrum. This is because the two of four eigenfunctions of the Hamiltonian for triplet pairing coincide with those for s-wave pairing when a relation holds between pairing symmetry and spin-orbit coupling, indicative of an s-wave-like property of triplet superconductors. As a result, the tunneling spectrum has s- and p-wave like features. This may serve as a tool for determining the pairing symmetry of triplet superconductors without inversion symmetry