Superconducting Quantum Interference in Twisted van der Waals Heterostructures

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...

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Bibliographic Details
Published inNano letters Vol. 21; no. 16; pp. 6725 - 6731
Main Authors Farrar, Liam S, Nevill, Aimee, Lim, Zhen Jieh, Balakrishnan, Geetha, Dale, Sara, Bending, Simon J
Format Journal Article
LanguageEnglish
Published American Chemical Society 25.08.2021
Subjects
Letter
Two-dimensional materials
Van der Waal heterostructures
NbSe2
Josephson junction
Superconducting quantum interference device
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Summary: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.
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ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.1c00152