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Scalable, Tunable Josephson Junctions and DC SQUIDs Based on CVD Graphene

Li, T; Gallop, JC; Hao, L; Romans, EJ; (2019) Scalable, Tunable Josephson Junctions and DC SQUIDs Based on CVD Graphene. IEEE Transactions on Applied Superconductivity , 29 (5) , Article 1101004. 10.1109/TASC.2019.2897999. Green open access

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Abstract

Since the carrier density and resistivity of graphene are heavily dependent on the Fermi level, Josephson junctions with graphene as the weak link can have their I-V properties easily tuned by the gate voltage. Most of the previous work on superconductor-graphene-superconductor (SGS) junctions and superconducting quantum interference devices (SQUIDs) were based on mechanically exfoliated graphene, which is not compatible with large scale production. Here, we show that SGS junctions and dc SQUIDs can be easily fabricated from chemical vapor deposition (CVD) graphene and exhibit good electronic properties. The SGS junctions can work without any hysteresis in their electrical characteristics from 1.5 K down to a base temperature of 320 mK, and the critical current can be effectively tuned by the gate voltage by up to an order of magnitude. As a result, dc SQUIDs made up of these junctions can have their critical current tuned by both the magnetic field and the gate voltage.

Type: Article
Title: Scalable, Tunable Josephson Junctions and DC SQUIDs Based on CVD Graphene
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TASC.2019.2897999
Publisher version: https://doi.org/10.1109/TASC.2019.2897999
Language: English
Additional information: © 2019 IEEE - All rights reserved. This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see (http://creativecommons.org/licenses/by/3.0/).
Keywords: Junctions, Josephson junctions, Critical current density (superconductivity), Graphene, SQUIDs, Logic gates, Resistance
UCL classification: UCL
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/10073202
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