We propose that the existence of vortices in ${\mathrm{FeSe}}_{1-x}{\mathrm{Te}}_x$ with and without Majorana zero modes (MZMs) can be explained by a heterogeneous mixture of strong topological and trivial superconducting domains, with only vortices in the former exhibiting MZMs. We identify the spectroscopic signatures of topological and trivial vortices and show that they are necessarily separated by a domain wall harboring Majorana edge modes. We demonstrate that when a vortex is moved from a trivial to a topological domain in real time, a domain wall Majorana edge mode is transferred to the vortex as an MZM.

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• Majorana bound states
• Topological superconductors
• Vortices in superconductors
• Chalcogenides
• Bogoliubov-de Gennes equations