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Ballistic Josephson junctions based on CVD graphene

Li, T; Gallop, J; Hao, L; Romans, E; (2018) Ballistic Josephson junctions based on CVD graphene. Superconductor Science and Technology, , 31 (4) , Article 045004. 10.1088/1361-6668/aaab81. Green open access

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Abstract

Josephson junctions with graphene as the weak link between superconductors have been intensely studied in recent years, with respect to both fundamental physics and potential applications. However, most of the previous work was based on mechanically exfoliated graphene, which is not compatible with wafer-scale production. To overcome this limitation, we have used graphene grown by chemical vapour deposition (CVD) as the weak link of Josephson junctions. We demonstrate that very short, wide CVD-graphene-based Josephson junctions with Nb electrodes can work without any undesirable hysteresis in their electrical characteristics from 1.5 K down to a base temperature of 320 mK, and their gate-tuneable critical current shows an ideal Fraunhofer-like interference pattern in a perpendicular magnetic field. Furthermore, for our shortest junctions (50 nm in length), we find that the normal state resistance oscillates with the gate voltage, consistent with the junctions being in the ballistic regime, a feature not previously observed in CVD-graphene-based Josephson junctions.

Type: Article
Title: Ballistic Josephson junctions based on CVD graphene
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1361-6668/aaab81
Publisher version: https://doi.org/10.1088/1361-6668/aaab81
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, Condensed Matter, Physics, Josephson junction, graphene, CVD, ballistic, SGS junction, hybrid structure, CONTACT-RESISTANCE, TRANSPORT, DEVICES
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10048741
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