Erasing odd-parity states in semiconductor quantum dots coupled to superconductors

Abstract

Quantum dots are gate-defined within InSb nanowires, in proximity to NbTiN superconducting contacts. As the coupling between the dot and the superconductor is increased, the odd-parity occupations become non-discernible (erased) both above and below the induced superconducting gap. Above the gap, conductance in the odd Coulomb valleys increases until the valleys are lifted. Below the gap, Andreev bound states undergo quantum phase transitions to singlet ground states at odd occupancy. We observe that the apparent erasure of odd-parity regimes coincides at low-bias and at high-bias. This observation is reproduced in numerical renormalization group simulations, and is explained qualitatively by a competition between Kondo temperature and the induced superconducting gap. In the erased odd-parity regime, the quantum dot exhibits transport features similar to a finite-size Majorana nanowire, drawing parallels between even-odd dot occupations and even-odd one-dimensional subband occupations.

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Cited by in corpus (8)

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• Large spatial extension of the zero-energy Yu-Shiba-Rusinov state in magnetic field
• From Cooper pair splitting to the non-local spectroscopy of a Shiba state
• Evidence of Andreev blockade in a double quantum dot coupled to a superconductor
• Josephson junctions in double nanowires bridged by in-situ deposited superconductors
• Structure Prediction of Epitaxial Inorganic Interfaces by Lattice and Surface Matching with Ogre
• Strongly correlated electrons in superconducting islands with fluctuating Cooper pairs
• Microwave susceptibility observation of interacting many-body Andreev states