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

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Scalable, Tunable Josephson Junctions and DC SQUIDs Based on CVD Graphene. / Li, Tianyi; Gallop, John C.; Hao, Ling; Romans, Edward J.

In: IEEE Transactions on Applied Superconductivity, Vol. 29, No. 5, 1101004, 08.2019.

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@article{7893d140159b49df8fb0f4b23f9be7ea,
title = "Scalable, Tunable Josephson Junctions and DC SQUIDs Based on CVD Graphene",
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.",
keywords = "Josephson junctions, nanomaterials, SQUIDS, superconducting devices",
author = "Tianyi Li and Gallop, {John C.} and Ling Hao and Romans, {Edward J.}",
year = "2019",
month = "8",
doi = "10.1109/TASC.2019.2897999",
language = "English",
volume = "29",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
number = "5",

}

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TY - JOUR

T1 - Scalable, Tunable Josephson Junctions and DC SQUIDs Based on CVD Graphene

AU - Li, Tianyi

AU - Gallop, John C.

AU - Hao, Ling

AU - Romans, Edward J.

PY - 2019/8

Y1 - 2019/8

N2 - 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.

AB - 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.

KW - Josephson junctions

KW - nanomaterials

KW - SQUIDS

KW - superconducting devices

U2 - 10.1109/TASC.2019.2897999

DO - 10.1109/TASC.2019.2897999

M3 - Article

VL - 29

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 5

M1 - 1101004

ER -

ID: 32860804