Superconducting Quantum Interference in Twisted van der Waals Heterostructures

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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 languageEnglish
Pages (from-to)6725-6731
JournalNano Letters
Volume21
Issue number16
Early online date16 Aug 2021
DOIs
Publication statusPublished - 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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