  When a strongly correlated quantum dot is tunnel-coupled to a superconductor,
it leads to the formation of Shiba bound states inside the superconducting gap.
They have been measured experimentally in a superconductor-quantum dot-normal
lead setup. Side coupling the quantum dot to a topological superconducting wire
that supports Majorana bound states at its ends, drastically affects the
structure of the Shiba states and induces supplementary in-gap states. The
anomalous coupling between the Majorana bound states and the quantum dot gives
rise to a characteristic imbalance in the spin resolved spectral functions for
the dot operators. These are clear fingerprints for the existence of Majorana
fermions and they can be detected experimentally in transport measurements. In
terms of methods employed, we have used analytical approaches combined with the
numerical renormalization group approach.
