Angle-resolved study of density-waves, superconductivity and pseudogap in two dimensions

TL;DR

This paper uses angle-resolved functional renormalization group to study how electron interactions in a 2D square lattice evolve, revealing the emergence of pseudogap behavior and d-wave superconductivity depending on doping levels.

Contribution

It provides a detailed analysis of momentum-dependent interactions and identifies the critical energy scales associated with pseudogap and superconducting phases.

Findings

Interaction develops pole-like solutions near critical energy scale

Pseudogap temperature T* is identified near half-filling

Overdoped regime shows mean-field d-wave superconductivity

Abstract

Weakly correlated electrons on a square lattice are studied by angle-resolved functional renormalization group. Upon renormalization the interaction starts to depend on momenta and has pole-like solutions near a doping-dependent characteristic critical energy scale. Near half-filling this scale is the pseudogap temperature T*. In the overdoped regime the critical scale is the mean-field like critical temperature for d-wave superconductivity.