Title
Spin-Mixing Enhanced Proximity Effect in Aluminum-Based Superconductor–Semiconductor Hybrids
Author
Mazur, G.P. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft)
van Loo, N. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft)
Wang, J. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft)
Dvir, T. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft) 
Wang, Guanzhong (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft)
Korneychuk, S. (Kavli institute of nanoscience Delft)
Borsoi, F. (TU Delft QCD/Veldhorst Lab; Kavli institute of nanoscience Delft)
Dekker, R.C. (TU Delft QN/Steele Lab; Kavli institute of nanoscience Delft)
Badawy, G.H.A. (Eindhoven University of Technology)
Vinke, Peter (Student TU Delft; Kavli institute of nanoscience Delft)
Quintero Perez, M. (TNO)
Heedt, S. (TU Delft BUS/Quantum Delft; Kavli institute of nanoscience Delft)
Kouwenhoven, Leo P. (TU Delft QN/Kouwenhoven Lab; Kavli institute of nanoscience Delft)
Date
2022
Abstract
In superconducting quantum circuits, aluminum is one of the most widely used materials. It is currently also the superconductor of choice for the development of topological qubits. However, aluminum-based devices suffer from poor magnetic field compatibility. Herein, this limitation is resolved by showing that adatoms of heavy elements (e.g., platinum) increase the critical field of thin aluminum films by more than a factor of two. Using tunnel junctions, it is shown that the increased field resilience originates from spin-orbit scattering introduced by Pt. This property is exploited in the context of the superconducting proximity effect in semiconductor–superconductor hybrids, where it is shown that InSb nanowires strongly coupled to Al/Pt films can maintain superconductivity up to 7 T. The two-electron charging effect is shown to be robust against the presence of heavy adatoms. Additionally, non-local spectroscopy is used in a three-terminal geometry to probe the bulk of hybrid devices, showing that it remains free of sub-gap states. Finally, it is demonstrated that proximitized semiconductor states maintain their ability to Zeeman-split in an applied magnetic field. Combined with the chemical stability and well-known fabrication routes of aluminum, Al/Pt emerges as the natural successor to Al-based systems and is a compelling alternative to other superconductors, whenever high-field resilience is required.
Subject
aluminum
high-magnetic-field
nanowires
superconductivity
To reference this document use:
http://resolver.tudelft.nl/uuid:8bf995b4-ad08-4e36-963d-7be4b193222e
DOI
https://doi.org/10.1002/adma.202202034
ISSN
0935-9648
Source
Advanced Materials, 34 (33)
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2022 G.P. Mazur, N. van Loo, J. Wang, T. Dvir, Guanzhong Wang, S. Korneychuk, F. Borsoi, R.C. Dekker, G.H.A. Badawy, Peter Vinke, M. Quintero Perez, S. Heedt, Leo P. Kouwenhoven, More Authors