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Updated: Mar 1, 2026

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Inducing superconductivity in Weyl semimetal microstructures by selective ion sputtering.

Maja D Bachmann1,2, Nityan Nair3, Felix Flicker3

  • 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.

Science Advances
|June 1, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method using ion irradiation to create superconducting microstructures from nonsuperconducting NbAs. This technique forms a superconducting surface layer, enabling potential applications in topological quantum devices.

Keywords:
Majorana-modeWeyl semi-metalsmicrostructuringproximity-induced superconductivityselective ion sputteringtopological quantum devices

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Superconducting states in Weyl or Dirac semimetals inherit nontrivial topology.
  • Weyl superconductors exhibit exotic phenomena like nonzero-momentum pairing and Majorana modes.
  • Proximity-induced superconductivity is crucial for studying nonsuperconducting Weyl semimetals.

Purpose of the Study:

  • To develop a reliable method for fabricating superconducting microstructures from nonsuperconducting Weyl semimetals.
  • To explore the potential of ion irradiation for creating topological quantum devices.

Main Methods:

  • Fabrication of superconducting microstructures from nonsuperconducting Weyl semimetal NbAs using ion irradiation.
  • Analysis of surface composition changes due to differential binding energies of Nb and As during ion milling.

Main Results:

  • Ion irradiation of NbAs forms a superconducting surface layer with a critical temperature (Tc) of approximately 3.5 K.
  • The process leads to Nb enrichment at the surface, creating an intrinsic superconductor-semimetal interface.
  • The proximity effect at this interface may enable effective gapping of Weyl nodes in the bulk.

Conclusions:

  • Ion irradiation offers a novel and scalable route for fabricating superconducting topological materials.
  • This method facilitates the creation of topological quantum devices from monoarsenides.
  • The technique holds promise for industrial-scale production of advanced quantum devices.