Electrostatic control of the proximity effect in the bulk of semiconductor-superconductor hybrids

Abstract

The proximity effect in semiconductor-superconductor nanowires is expected to generate an induced gap in the semiconductor. The magnitude of this induced gap, together with the semiconductor properties like the spin-orbit coupling and $g$\,-\,factor, depends on the coupling between the materials. It is predicted that this coupling can be adjusted through the use of electric fields. We study this phenomena in InSb/Al/Pt hybrids using nonlocal spectroscopy. We show that these hybrids can be tuned such that the semiconductor and superconductor are strongly coupled. In this case, the induced gap is similar to the superconducting gap in the Al/Pt shell and closes only at high magnetic fields. In contrast, the coupling can be suppressed which leads to a strong reduction of the induced gap and critical magnetic field. At the crossover between the strong-coupling and weak-coupling regimes, we observe the closing and reopening of the induced gap in the bulk of a nanowire. Contrary to expectations, it is not accompanied by the formation of zero-bias peaks in the local conductance spectra. As a result, this cannot be attributed conclusively to the anticipated topological phase transition and we discuss possible alternative explanations.

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Cited by in corpus (14)

• Signatures of Majorana protection in a three-site Kitaev chain
• Electrostatic control of the proximity effect in the bulk of semiconductor-superconductor hybrids
• Adversarial Hamiltonian learning of quantum dots in a minimal Kitaev chain
• Progress in superconductor-semiconductor topological Josephson junctions
• Spin-filtered measurements of Andreev bound states
• Supercurrent through an Andreev trimer
• Nonlocality of local Andreev conductances as a probe for topological Majorana wires
• Interfacially enhanced superconductivity in Fe(Te,Se)/Bi4Te3 heterostructures
• Anomalous negative magnetoresistance in quantum-dot Josephson junctions with Kondo correlations
• Richardson model with complex level structure and spin-orbit coupling for hybrid superconducting islands: stepwise suppression of pairing and magnetic pinning
• Spin-resolved nonlocal transport in proximitized Rashba nanowires
• Exploring the energy spectrum of a four-terminal Josephson junction: Towards topological Andreev band structures
• Josephson tunnel junction arrays and Andreev weak links: linked by a single energy-phase relation
• Gate-tunable superconductor-semiconductor coupling and its impact on zero-energy modes in PbTe-Pb nanowires