The Theory of Tunneling in Normal Metal/d-Type Superconductor 2D-Structures

摘要

A sequential theoretical analysis is performed of tunneling in normal metal/d-type superconductor structures which contain scattering centers in the interlayer between a normal metal and a superconductor. As a result, it is demonstrated that the presence of a scattering center inside an insulator interlayer leads to partial suppression of previously predicted anomalously high values of conductance in the low-voltage region (zero bias anomaly (ZBA)). In so doing, the inclusion of the "interference" term in the current operator (interference of tunneling through a scattering center with direct potential tunneling) results in the suppression of ZBA. The predicted effect is virtually independent both of the position of the scattering center in the interlayer and of the shape of the resonance curve of scattering (which is Lorentzian in the case of resonance tunneling through the scattering center).