Interface scattering effect on the differential conductance of normal-metal superconductor junctions

Taking into account the interface roughness of normal-metal/superconductor junction, we propose an effective Hamiltonian for the interface scattering. In the framework of Blonder-Tinkham-Klapwijk (BTK) model, we calculate the differential conductance of N/S junction in the presence of the interface scattering. As well, the effect of the finite lifetime of the quasi-particles due to the inelastic scattering is also addressed. Our results are in qualitative agreement with experiments. © Springer-Verlag 1996.link_to_subscribed_fulltex