Proximity effect on the interface of normal metal/d-wave superconductors

Abstract

We study local density of states in normal metal/d-wave superconductor (N/D) junctions in the presence of a subdominant s-wave pair potential near the interface. In order to study the degree of the proximity effect, we determine the spatial dependence of the pair potential based on the quasiclassical Green's function procedure. We show that the amplitude of the induced subdominant component is significantly sensitive to the transparency of the junction. Moreover, they are much more enhanced by the attractive interaction in N. For low transparent limit, our results are consistent with previous quasiclassical theories.