Superconducting Quantum Interference in Twisted van der Waals Heterostructures.
Superconducting Quantum Interference in Twisted van der Waals Heterostructures.
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DOI:
10.1021/acs.nanolett.1c00152
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发表时间:
2021-08-25
期刊:
影响因子:
10.8
通讯作者:
Bending SJ
中科院分区:
文献类型:
--
作者:
Farrar LS;Nevill A;Lim ZJ;Balakrishnan G;Dale S;Bending SJ
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 ΔIc ∼ 75% and ΔV ∼ 1.4 mV, respectively.
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