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

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.