  The prospect of using semiconductor quantum dots as an experimental tool to
distinguish Majorana zero modes (MZMs) from other zero-energy excitations such
as Kondo resonances has brought up the fundamental question of whether
topological superconductivity and the Kondo effect can coexist in these
systems. Here, we study the Kondo effect in a quantum dot coupled to a metallic
contact and to a pair of MZMs. We consider a situation in which the MBS are
spin polarized in opposite directions. By using numerical renormalization-group
calculations and scaling analysis of the renormalization group equations, we
show that the Kondo effect takes place at low temperatures, regardless the
coupling to the MZMs. Interestingly, we find that the Kondo singlet essentially
decouples from the MZMs such that the residual impurity entropy can show local
non-Fermi liquid properties characteristic of the single Majorana excitations.
This offers the possibility of tuning between Fermi-liquid and non-Fermi-liquid
regimes simply by changing the quantum dot-MZM couplings.
