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Pair Density Wave Order from Electron Repulsion.

Yi-Ming Wu1, P A Nosov1, Aavishkar A Patel2

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This summary is machine-generated.

Researchers identified a new mechanism for pair density wave (PDW) superconductors. This involves specific spatial variations in repulsive interactions, leading to robust PDW phases and novel quantum critical points.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity

Background:

  • Pair density wave (PDW) states are exotic superconductors characterized by a spatially periodic order parameter.
  • A generic pairing mechanism for PDW order has remained elusive due to their non-Fermi liquid nature.

Purpose of the Study:

  • To describe and solve models that exhibit robust pair density wave (PDW) phases.
  • To identify the fundamental requirements for achieving long-range PDW order.

Main Methods:

  • Utilized large-N limits of Fermi liquids with repulsive BCS interactions.
  • Employed saddle point solutions to access the intermediate coupling limit.
  • Analyzed the spatial dependence and strength of repulsive BCS couplings.

Main Results:

  • Demonstrated that nonmonotonic spatial variations in repulsive BCS couplings are essential for PDW order.
  • Identified a threshold strength for these couplings to stabilize PDW phases.
  • Obtained a phase diagram featuring finite temperature transitions to PDW order and a T=0 quantum critical point.

Conclusions:

  • Established a viable mechanism for realizing pair density wave (PDW) superconductivity.
  • Highlighted the role of specific repulsive interactions in stabilizing exotic superconducting states.
  • Revealed non-Fermi liquid behavior at a quantum critical point associated with PDW order.