  A remarkable feature of topological superconductors is the emergence of
Majorana fermions in electron systems. Whereas the emergent Majorana fermions
share the self-anti-particle property with Majorana fermions in particle
physics, they may have essentially different electromagnetic properties. In
this paper, we argue the electromagnetic response of spinful Majorana fermions
in topological superconductors. We present a general theory of the
electromagnetic response of spinful Majorana fermions in topological
superconductors and clarify how the pairing symmetry is encoded in the
electromagnetic response. As an application, we predict the
sublattice-dependent dipole (Ising)-type magnetic response of corner Majorana
fermions in iron-based superconductors.
