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Superconducting quantum interference effect in NbSe2/NbSe2van der Waals junctions.

Yu Jian1,2, Qi Feng1,2, Jinrui Zhong1,2

  • 1Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 19, 2022
PubMed
Summary

Researchers observed unique voltage oscillations in niobium selenide (NbSe2) vdW junctions under magnetic fields. These oscillations, driven by quantum interference, pave the way for novel superconducting quantum interference devices.

Keywords:
Josephson junctionNbSe2quantum interferenceresistance oscillations

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Layered materials exhibit exotic superconducting and ferromagnetic properties.
  • Van der Waals (vdW) stacking enables fabrication of novel junction structures with clean interfaces.
  • Niobium diselenide (NbSe2) vdW Josephson junctions demonstrate high supercurrent transparency.

Purpose of the Study:

  • To investigate the behavior of NbSe2/NbSe2 vdW junctions under in-plane magnetic fields.
  • To characterize the observed voltage drop oscillations and their dependence on temperature and magnetic field.
  • To elucidate the underlying physical mechanism responsible for the oscillations.

Main Methods:

  • Fabrication of NbSe2/NbSe2 vdW junctions.
  • Measurement of voltage drop across the junction under varying in-plane magnetic fields and temperatures.
  • Analysis of oscillation characteristics, including magnitude and temperature dependence.

Main Results:

  • Observation of periodic voltage drop oscillations across NbSe2/NbSe2 vdW junctions in an in-plane magnetic field.
  • The oscillation magnitude exhibits non-monotonic temperature dependence, increasing with temperature initially.
  • These features distinguish the oscillations from standard Josephson junction critical current modulation and the Little-Parks effect.

Conclusions:

  • The observed oscillations are attributed to quantum interference between two superconducting junctions within the vdW interface.
  • This phenomenon provides a pathway for developing in-plane superconducting quantum interference devices (SQUIDs).
  • The proposed device leverages the Ising-pairing nature of NbSe2 and can operate under high magnetic fields.