Model of d-wave electron pairing in hole doped cuprate superconductors: A possible explanation for the pseudogap regime

TL;DR

This paper proposes a d-wave pairing model for hole-doped cuprate superconductors, explaining the pseudogap phenomena and Fermi surface features without requiring a pairing 'glue', and predicts a linear T* versus doping relationship.

Contribution

It introduces a real-space localized hole pair model with d-wave symmetry based on Coulomb confinement, offering a unified explanation for pseudogap behavior and Fermi surface features.

Findings

Pairing occurs inside a single plaquette with d-wave symmetry.

The model explains the linear relationship between pseudogap temperature T* and doping level x.

Provides a physical origin for Fermi pockets and pseudogap phenomena.

Abstract

The real-space localized hole pair is constructed in the Cu-O plane of the hole-doped cuprate superconductors. We prove analytically and numerically that two electrons, due to the nearest-neighbor Coulomb repulsive confinement effect, can be in pairing inside a single plaquette with the d-wave symmetry. The scenario supports the `no glue' pairing picture for the cuprates. Based on the scenarios, the physical origin of the Fermi pocket (or Fermi arc) and the two pseudogap behavior are provided. Our framework leads directly to a unified linear relationship between the pseudogap temperature T* and the hole doping level x in these compounds.