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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 ΔI_c ∼ 75% and ΔV ∼ 1.4 mV, respectively.

SUBMITTER: Farrar LS

PROVIDER: S-EPMC8397396 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature

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Superconducting Quantum Interference in Twisted van der Waals Heterostructures.

Farrar Liam S LS Nevill Aimee A Lim Zhen Jieh ZJ Balakrishnan Geetha G Dale Sara S Bending Simon J SJ

Nano letters 20210816 16

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 performan ...[more]

PMID: 34428907

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