Abstract
We study the low energy spectrum and transport properties of a correlated quantum dot coupled between normal and superconducting reservoirs and additionally hybridized with a topological superconducting nanowire, hosting the Majorana end-modes. In this setup the Majorana quasiparticle leaking into the quantum dot can be confronted simultaneously with the on-dot pairing and correlations. We study this interplay, focusing on the quantum phase transition from the spinless (BCS-type) to the spinful (singly occupied) configuration, where the subgap Kondo effect may arise. Using the selfconsistent perturbative treatment for correlations and the unbiased numerical renormalization group calculations we find that the Majorana mode has either constructive or destructive effect on the low-energy transport behavior of the quantum dot, depending on its spin. This spin-selective influence could be verified by means of the polarized STM spectroscopy.
Highlights
Recent intensive studies of nanoscopic superconductors focused on quasiparticles, which resemble the Majorana fermions[1,2,3,4,5,6,7] that are identical to their own antiparticles
In the absence of Majorana quasiparticles the interplay between correlations and proximity induced on-dot pairing has been investigated in N-quantum dots (QDs)-S junctions by several groups[39,40,41]
We study the role of Majorana mode, exploring its influence on the subgap electronic states
Summary
Recent intensive studies of nanoscopic superconductors focused on quasiparticles, which resemble the Majorana fermions[1,2,3,4,5,6,7] that are identical to their own antiparticles. Coalescence of the Andreev (finite-energy) bound states into the Majorana (zero-energy) quasiparticles has been achieved in hybrid structures, comprising quantum dots (QDs) side-attached to topological superconducting nanowires[30,31]. When attaching individual Fe atoms to the already existing nanochain, the spin-polarized STM measurements (using PtIr tips) inspected emergence of the Majorana modes from the Andreev bound states and controlled ongoing evolution of quasiparticles in the nanochain Such atom-by-atom construction of nanoscopic hybrids can help verifying the subtle interplay of the Majorana quasiparticles with the subgap Kondo effect. We study this issue in a systematic way predicting novel spin-resolved signatures
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