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We study the conductance of a junction between the normal and superconductingsegments of a nanowire, both of which are subjected to spin-orbit coupling andan external magnetic field. We directly compare the transport properties of thenanowire assuming two different models for the superconducting segment: onewhere we put superconductivity by hand into the wire, and one wheresuperconductivity is induced through a tunneling junction with a bulk s-wavesuperconductor. While these two models are equivalent at low energies and atweak coupling between the nanowire and the superconductor, we show that thereare several interesting qualitative differences away from these two limits. Inparticular, the tunneling model introduces an additional conductance peak atthe energy corresponding to the bulk gap of the parent superconductor. Byemploying a combination of analytical methods at zero temperature and numericalmethods at finite temperature, we show that the tunneling model of theproximity effect reproduces many more of the qualitative features that are seenexperimentally in such a nanowire system.

Transport signatures of topological superconductivity in a proximity-coupled nanowire