Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots

Abstract

We study transport mediated by Andreev bound states formed in InSb nanowire quantum dots. Two kinds of superconducting source and drain contacts are used: epitaxial Al/InSb devices exhibit a doubling of tunneling resonances, while in NbTiN/InSb devices Andreev spectra of the dot appear to be replicated multiple times at increasing source-drain bias voltages. In both devices, a mirage of a crowded spectrum is created. To describe the observations a model is developed that combines the effects of a soft induced gap and of additional Andreev bound states both in the quantum dot and in the finite regions of the nanowire adjacent to the quantum dot. Understanding of Andreev spectroscopy is important for the correct interpretation of Majorana experiments done on the same structures.

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• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
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• A perspective on semiconductor-based superconducting qubits
• Supercurrent in a double quantum dot
• Two-Impurity Yu-Shiba-Rusinov States in Coupled Quantum Dots
• 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
• Progress in superconductor-semiconductor topological Josephson junctions
• Evidence of Andreev blockade in a double quantum dot coupled to a superconductor
• Direct Transport between Superconducting Subgap States in a Double Quantum Dot
• A quantum dot in germanium proximitized by a superconductor
• Zeeman and Orbital Driven Phase Transitions in Planar Josephson Junctions
• Topological isoconductance signatures in Majorana nanowires
• Nonlocal measurement of quasiparticle charge and energy relaxation in proximitized semiconductor nanowires using quantum dots
• Intermediate states in Andreev bound state fusion
• Erasing odd-parity states in semiconductor quantum dots coupled to superconductors
• Microwave-induced conductance replicas in hybrid Josephson junctions without Floquet-Andreev states
• Zero energy states clustering in an elemental nanowire coupled to a superconductor
• Richardson model with complex level structure and spin-orbit coupling for hybrid superconducting islands: stepwise suppression of pairing and magnetic pinning
• Gate-tunable negative differential conductance in hybrid semiconductor-superconductor devices
• Renormalized and iterative formalism of the Andreev levels within large multi-parametric space
• Spin splitting, Kondo correlation and singlet-doublet quantum phase transition in a superconductor-coupled InSb nanosheet quantum dot
• Miraging a Majorana