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Nematicity-enhanced superconductivity in systems with a non-Fermi liquid behavior.

Sharareh Sayyad1,2, Motoharu Kitatani3,4, Abolhassan Vaezi5

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Summary
This summary is machine-generated.

Nematicity, driven by many-body effects in flat-band systems, enhances superconductivity. This leads to higher transition temperatures and non-Fermi liquid behavior in partially flat-band models.

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flat band physicsnematicitysuperconductivity

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • Partially flat-band (PFB) models on the triangular lattice exhibit complex electronic behaviors.
  • Nematicity, the spontaneous breaking of sixfold rotational symmetry, and superconductivity are key phenomena in these systems.

Purpose of the Study:

  • To investigate the interplay between nematicity, superconductivity, and non-Fermi liquid behavior in PFB models.
  • To understand how nematicity influences superconducting properties and electron behavior.

Main Methods:

  • Theoretical modeling of PFB systems on a triangular lattice.
  • Analysis of Pomeranchuk instability and its effect on electronic interactions.
  • Investigation of superconducting pairing symmetries and transition temperatures.

Main Results:

  • Nematicity, driven by many-body effects, systematically enhances the superconducting transition temperature (Tc) on the Tc dome.
  • A plausible sx2+y2-dx2-y2-dxy-wave symmetry governs nematicity-enhanced pairing, leading to a sharp rise in Tc.
  • Spontaneous symmetry breaking strengthens pairing interactions and results in more compact Cooper pairs.
  • These phenomena are accompanied by non-Fermi liquid electron behavior in PFBs.

Conclusions:

  • Nematicity plays a crucial role in enhancing superconductivity in PFB systems.
  • The study reveals a novel pairing symmetry associated with nematicity.
  • The findings provide insights into the emergence of non-Fermi liquid behavior in correlated electron systems.