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Hard-gap spectroscopy in a self-defined mesoscopic InAs / Al nanowire Josephson Junction
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Zellekens, Patrick, Deacon, Russell, Perla, Pujitha, Fonseka, H. Aruni, Mörstedt, Timm, Hindmarsh, Steven A., Bennemann, Benjamin, Lentz, Florian, Lepsa, Mihail I., Sánchez, Ana M., Grützmacher, Detlev, Ishibashi, Koji and Schäpers, Thomas (2020) Hard-gap spectroscopy in a self-defined mesoscopic InAs / Al nanowire Josephson Junction. Physical Review Applied, 14 (5). 054019. doi:10.1103/PhysRevApplied.14.054019 ISSN 2331-7019.
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Official URL: http://dx.doi.org/10.1103/PhysRevApplied.14.054019
Abstract
Superconductor-semiconductor-nanowire hybrid structures can serve as versatile building blocks to realize Majorana circuits or superconducting qubits based on quantized levels such as Andreev qubits. For all these applications, it is essential that the superconductor-semiconductor interface is as clean as possible. Furthermore, the shape and dimensions of the superconducting electrodes need to be precisely controlled. We fabricated self-defined
InAs/Al core-shell nanowire junctions by a fully in-situ approach, which meet all these criteria. Transmission electron microscopy measurements confirm the sharp and clean interface between the nanowire and the in-situ deposited Al electrodes that are formed by means of shadow evaporation. Furthermore, we report on tunnel spectroscopy, gate, and magnetic field-dependent transport measurements. The achievable short junction lengths, the observed hard gap, and the magnetic field robustness make this hybrid structure very attractive for applications that rely on a precise control of the number of subgap states, like Andreev qubits or topological systems
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Josephson junctions, Majorana fermions, Superconductivity, Nanowires | |||||||||||||||||||||
Journal or Publication Title: | Physical Review Applied | |||||||||||||||||||||
Publisher: | American Physical Society | |||||||||||||||||||||
ISSN: | 2331-7019 | |||||||||||||||||||||
Official Date: | 10 November 2020 | |||||||||||||||||||||
Dates: |
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Volume: | 14 | |||||||||||||||||||||
Number: | 5 | |||||||||||||||||||||
Article Number: | 054019 | |||||||||||||||||||||
DOI: | 10.1103/PhysRevApplied.14.054019 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||
Copyright Holders: | © 2020 American Physical Society | |||||||||||||||||||||
Date of first compliant deposit: | 28 January 2021 | |||||||||||||||||||||
Date of first compliant Open Access: | 29 January 2021 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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