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Fabrication and Characterization of Superconducting Resonators
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Inter-node superconductivity in strained Weyl semimetals.

P O Sukhachov1, E V Gorbar2,3, I A Shovkovy4,5

  • 1Department of Applied Mathematics, Western University, London, Ontario, N6A 5B7, Canada.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 8, 2018
PubMed
Summary

Strain-induced pseudomagnetic fields affect spin-triplet superconductivity in Weyl semimetals. The lowest energy state has no electric or chiral currents, unaffected by field strength.

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Area of Science:

  • Condensed Matter Physics
  • Solid State Physics
  • Quantum Materials

Background:

  • Weyl semimetals exhibit unique electronic properties due to their band structure.
  • Superconducting states in these materials can be influenced by external stimuli.
  • Strain engineering offers a method to tune material properties.

Purpose of the Study:

  • Investigate the impact of strain-induced pseudomagnetic fields on spin-triplet superconductivity.
  • Analyze the behavior of Cooper pairing in response to these fields.
  • Determine the conditions for distinct superconducting phases.

Main Methods:

  • Utilized the quasiclassical Eilenberger formalism.
  • Modeled the effects of pseudomagnetic fields on superconducting states.
  • Calculated energy gaps and current properties.

Main Results:

  • Identified a lowest energy spin-triplet superconducting state with spins parallel to the pseudomagnetic field.
  • This state exhibits no electric or chiral superconducting currents and its gap is field-independent.
  • Superconducting states with spins normal to the field support chiral currents and are suppressed by the field.

Conclusions:

  • Strain-induced pseudomagnetic fields play a crucial role in determining the nature of superconductivity in Weyl semimetals.
  • The orientation of Cooper pair spins relative to the field dictates the presence of chiral currents and the stability of the superconducting phase.
  • Critical field values separating normal and superconducting phases were estimated.