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

Tianyi Li*, John C. Gallop, Ling Hao, Edward J. Romans

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


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.

Original languageEnglish
Article number1101004
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number5
Publication statusPublished - Aug 2019
MoE publication typeA1 Journal article-refereed


  • Josephson junctions
  • nanomaterials
  • superconducting devices

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