  The combination of two-dimensional Dirac surface states with s-wave
superconductivity is expected to generate localized topological Majorana zero
modes in vortex cores. Putative experimental signatures of these modes have
been reported for heterostructures of proximitized topological insulators,
iron-based superconductors or certain transition metal dichalcogenides. Despite
these efforts, the Majorana nature of the observed excitation is still under
debate. We propose to identify the presence of Majorana vortex modes using a
nonlocal transport measurement protocol originally employed for one-dimensional
settings. In the case of an isolated subgap state, the protocol provides a
spatial map of the ratio of local charge- and probability-density which offers
a clear distinction between Majorana and ordinary fermionic modes. We show that
these distinctive features survive in the experimentally relevant case of
hybridizing vortex core modes.
