Abstract
A formalism which combines Gorkov's Green function description of the superconducting state and a surface Green function method is proposed to calculate tunnelling currents in normal metal-superconductor junctions. The method allows a straightforward calculation of the reflection and transmission matrices, among other physical magnitudes of interest. A simple example (at T=0), based upon elementary BCS theory, is carried out in detail. The results are in full agreement with previous analyses on this system, which used the matching of wavefunctions at the interface. The formalism is compared with other Green function approaches to the present problem.
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