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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probing pairing symmetry in multi-band superconductors by quasiparticle interference.

A Dutt1, A A Golubov1,2, D V Efremov3

  • 1Faculty of Science and Technology and MESA+ Institute of Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands.

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Quasiparticle interference (QPI) in multiband superconductors reveals distinct momentum dependencies for s± and s++ symmetries near the small gap. This finding aids in probing pairing symmetry in unconventional superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity Theory
  • Materials Science

Background:

  • Quasiparticle interference (QPI) is a powerful probe of electronic structure in superconductors.
  • Understanding the pairing symmetry is crucial for classifying and developing novel superconducting materials.

Purpose of the Study:

  • To investigate the momentum and energy dependencies of the QPI response function in multiband superconductors.
  • To differentiate between s± and s++ superconducting order parameter symmetries using QPI.

Main Methods:

  • Utilizing the strong-coupling Eliashberg theory.
  • Employing an effective two-band model for superconductors.
  • Analyzing the QPI response function across different energy scales and momentum transfers.

Main Results:

  • The momentum dependence of QPI exhibits significant differences between s± and s++ symmetries at energies near the small gap.
  • At higher energies, around the large gap, the QPI response becomes indistinguishable for both symmetries.
  • The energy and momentum signatures of QPI are sensitive to the relative signs of the order parameters in different bands.

Conclusions:

  • QPI measurements can distinguish between s± and s++ pairing symmetries in multiband superconductors, particularly at low energies.
  • This work provides a theoretical guide for experimentalists seeking to determine pairing symmetries in iron pnictides and other unconventional superconductors.