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Fully in situ Nb/InAs-nanowire Josephson junctions by selective-area growth and shadow evaporation
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Perla, Pujitha, Fonseka, H. Aruni, Zellekens, Patrick, Deacon, Russell, Han, Yisong, Kölzer, Jonas, Mörstedt, Timm, Bennemann, Benjamin, Espiari, Abbas, Ishibashi, Koji, Grützmacher, Detlev, Sánchez, Ana M., Lepsa, Mihail Ion and Schäpers, Thomas (2021) Fully in situ Nb/InAs-nanowire Josephson junctions by selective-area growth and shadow evaporation. Nanoscale Advances, 3 (5). pp. 1413-1421. doi:10.1039/D0NA00999G ISSN 2516-0230.
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WRAP-Fully-in-situ-Nb-InAs-nanowire-Josephson-junctions-2021.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution. Download (875Kb) | Preview |
Official URL: http://dx.doi.org/10.1039/D0NA00999G
Abstract
Josephson junctions based on InAs semiconducting nanowires and Nb superconducting electrodes are fabricated in situ by a special shadow evaporation scheme for the superconductor electrode. Compared to other metallic superconductors such as Al, Nb has the advantage of a larger superconducting gap which allows operation at higher temperatures and magnetic fields. Our junctions are fabricated by shadow evaporation of Nb on pairs of InAs nanowires grown selectively on two adjacent tilted Si (111) facets and crossing each other at a small distance. The upper wire relative to the deposition source acts as a shadow mask determining the gap of the superconducting electrodes on the lower nanowire. Electron microscopy measurements show that the fully in situ fabrication method gives a clean InAs/Nb interface. A clear Josephson supercurrent is observed in the current–voltage characteristics, which can be controlled by a bottom gate. The large excess current indicates a high junction transparency. Under microwave radiation, pronounced integer Shapiro steps are observed suggesting a sinusoidal current–phase relation. Owing to the large critical field of Nb, the Josephson supercurrent can be maintained to magnetic fields exceeding 1 T. Our results show that in situ prepared Nb/InAs nanowire contacts are very interesting candidates for superconducting quantum circuits requiring large magnetic fields.
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 , Nanowires, Superconductivity | |||||||||||||||
Journal or Publication Title: | Nanoscale Advances | |||||||||||||||
Publisher: | Royal Society of Chemistry | |||||||||||||||
ISSN: | 2516-0230 | |||||||||||||||
Official Date: | 7 March 2021 | |||||||||||||||
Dates: |
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Volume: | 3 | |||||||||||||||
Number: | 5 | |||||||||||||||
Page Range: | pp. 1413-1421 | |||||||||||||||
DOI: | 10.1039/D0NA00999G | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
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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