Electron temperature and tunnel coupling dependence of zero-bias and almost-zero-bias conductance peaks in Majorana nanowires

A key signature of a topological Majorana zero mode is the 2e²/h quantized zero-temperature zero-bias conductance of a metal-superconductor tunnel junction. This theoretical work shows that the finite-temperature Majorana conductance obeys a scaling relation with respect to a single dimensionless parameter, given by the ratio of the temperature and tunnel coupling, but only in the limit of weak tunneling and low temperature. Unfortunately, exactly the same scaling also applies to the zero-bias conductance arising from trivial Andreev bound states. This implies that a clear distinction between topological and trivial physics is not feasible based on such scaling plots.