Fingerprints of Majorana fermions in spin-resolved subgap spectroscopy

Abstract

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.

5 pages, 3 figures

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Cited by in corpus (9)

• On controlling the bound states in quantum-dot hybrid-nanowire
• Spin and Charge Signatures of Topological Superconductivity in Rashba Nanowires
• Kondo and Majorana signatures near the singlet-doublet quantum phase transition
• Topological superconductivity from magnetic impurities on monolayer NbSe${}_2$
• Spin-resolved interference due to Majorana state on interface between normal and superconducting leads
• Kondo physics in double quantum dot based Cooper pair splitters
• Leakage of Majorana mode into correlated quantum dot nearby its singlet-doublet crossover
• Experimental review on Majorana zero-modes in hybrid nanowires
• Interplay between pairing and correlations in spin-polarized bound states