0_2828 Magnetic topological insulators (MTIs) are outstanding candidates for the realization of
topological 1D and 2D superconducting phases, which can host end-localized or
propagating Majorana modes. However, their experimental detection is still a matter of
concern.
We propose to detect such elusive states in a normal-superconductor-normal (NSN)
junction between normal (N) and proximitized (S) MTI slabs, by applying different bias
drops to the two normal leads of the device. The occurrence of charge-nonconserving Andreev processes entails a nonzero conductance related to an electric current flowing to ground from the proximitized sector of the NSN junction. Through theoretical analysis and numerical simulations, we show that topologically protected Majorana modes require an antisymmetry of this conductance with respect to the point of equally split bias voltage across the junction. Conversely, trivial Andreev levels are not necessarily constrained to such an antisymmetric profile, making the antisymmetry of the conductance a useful, tough not conclusive, criterion for the experimental detection of topological superconducting phases with Majorana boundary modes.