Superconducting Quantum Interference in Twisted van der Waals Heterostructures

Liam S. Farrar; Aimee Nevill; Zhen Jieh Lim; Geetha Balakrishnan; Sara Dale; Simon J. Bending

doi:10.1021/acs.nanolett.1c00152

Superconducting Quantum Interference in Twisted van der Waals Heterostructures

Liam S. Farrar, Aimee Nevill, Zhen Jieh Lim, Geetha Balakrishnan, Sara Dale, Simon J. Bending

Research output: Contribution to journal › Article › peer-review

11 Citations (SciVal)

Abstract

We demonstrate the formation of both Josephson junctions and superconducting quantum interference devices (SQUIDs) using a dry transfer technique to stack and deterministically misalign mechanically exfoliated flakes of NbSe2. The current-voltage characteristics of the resulting twisted NbSe2-NbSe2 junctions are found to be sensitive to the misalignment angle of the crystallographic axes, opening up a new control parameter for optimization of the device performance, which is not available in thin-film-deposited junctions. A single lithographic process has then been implemented to shape Josephson junctions into SQUID geometries with typical loop areas of ∼25 μm2 and weak links ∼600 nm wide. At T = 3.75 K in an applied magnetic field, these devices display large stable current and voltage modulation depths of up to Δc ∼75% and ΔV ∼1.4 mV, respectively.

Original language	English
Pages (from-to)	6725-6731
Number of pages	7
Journal	Nano Letters
Volume	21
Issue number	16
Early online date	16 Aug 2021
DOIs	https://doi.org/10.1021/acs.nanolett.1c00152
Publication status	Published - 25 Aug 2021

Keywords

Josephson junction
NbSe
Superconducting quantum interference device
Two-dimensional materials
Van der Waal heterostructures

ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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10.1021/acs.nanolett.1c00152Licence: CC BY

Cite this

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title = "Superconducting Quantum Interference in Twisted van der Waals Heterostructures",

abstract = "We demonstrate the formation of both Josephson junctions and superconducting quantum interference devices (SQUIDs) using a dry transfer technique to stack and deterministically misalign mechanically exfoliated flakes of NbSe2. The current-voltage characteristics of the resulting twisted NbSe2-NbSe2 junctions are found to be sensitive to the misalignment angle of the crystallographic axes, opening up a new control parameter for optimization of the device performance, which is not available in thin-film-deposited junctions. A single lithographic process has then been implemented to shape Josephson junctions into SQUID geometries with typical loop areas of ∼25 μm2 and weak links ∼600 nm wide. At T = 3.75 K in an applied magnetic field, these devices display large stable current and voltage modulation depths of up to Δc ∼75% and ΔV ∼1.4 mV, respectively. ",

keywords = "Josephson junction, NbSe, Superconducting quantum interference device, Two-dimensional materials, Van der Waal heterostructures",

author = "Farrar, {Liam S.} and Aimee Nevill and Lim, {Zhen Jieh} and Geetha Balakrishnan and Sara Dale and Bending, {Simon J.}",

note = "Funding Information: The authors thank Peter Heard at the IAC, University of Bristol, for their useful discussions and supporting work at the early phases of this study. The research was funded by the Bath/Bristol Centre for Doctoral Training in Condensed Matter Physics, under the EPSRC (UK) grant no. EP/L015544. The work at the University of Warwick is supported through EPSRC grant no. EP/T005963/1. A.N., Z.J.L., and S.D. acknowledge financial support from the Royal Society. ",

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AU - Farrar, Liam S.

AU - Nevill, Aimee

AU - Lim, Zhen Jieh

AU - Balakrishnan, Geetha

AU - Dale, Sara

AU - Bending, Simon J.

N1 - Funding Information: The authors thank Peter Heard at the IAC, University of Bristol, for their useful discussions and supporting work at the early phases of this study. The research was funded by the Bath/Bristol Centre for Doctoral Training in Condensed Matter Physics, under the EPSRC (UK) grant no. EP/L015544. The work at the University of Warwick is supported through EPSRC grant no. EP/T005963/1. A.N., Z.J.L., and S.D. acknowledge financial support from the Royal Society.

PY - 2021/8/25

Y1 - 2021/8/25

N2 - We demonstrate the formation of both Josephson junctions and superconducting quantum interference devices (SQUIDs) using a dry transfer technique to stack and deterministically misalign mechanically exfoliated flakes of NbSe2. The current-voltage characteristics of the resulting twisted NbSe2-NbSe2 junctions are found to be sensitive to the misalignment angle of the crystallographic axes, opening up a new control parameter for optimization of the device performance, which is not available in thin-film-deposited junctions. A single lithographic process has then been implemented to shape Josephson junctions into SQUID geometries with typical loop areas of ∼25 μm2 and weak links ∼600 nm wide. At T = 3.75 K in an applied magnetic field, these devices display large stable current and voltage modulation depths of up to Δc ∼75% and ΔV ∼1.4 mV, respectively.

AB - We demonstrate the formation of both Josephson junctions and superconducting quantum interference devices (SQUIDs) using a dry transfer technique to stack and deterministically misalign mechanically exfoliated flakes of NbSe2. The current-voltage characteristics of the resulting twisted NbSe2-NbSe2 junctions are found to be sensitive to the misalignment angle of the crystallographic axes, opening up a new control parameter for optimization of the device performance, which is not available in thin-film-deposited junctions. A single lithographic process has then been implemented to shape Josephson junctions into SQUID geometries with typical loop areas of ∼25 μm2 and weak links ∼600 nm wide. At T = 3.75 K in an applied magnetic field, these devices display large stable current and voltage modulation depths of up to Δc ∼75% and ΔV ∼1.4 mV, respectively.

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Superconducting Quantum Interference in Twisted van der Waals Heterostructures

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Superconducting Quantum Interference in Twisted van der Waals Heterostructures

Abstract

Keywords

ASJC Scopus subject areas

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Fingerprint

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Graphene Nanosensors for Scanning Hall Microscopy and Susceptometry

EPSRC Centre for Doctoral Training in Condensed Matter Physics

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