Study of ARPES data and d-wave superconductivity using electronic models in two dimensions

TL;DR

This paper investigates ARPES data and models d-wave superconductivity in two-dimensional high-Tc cuprates, explaining unusual spectral features and proposing a model with high critical temperature and optimal doping.

Contribution

It provides a theoretical explanation for ARPES features and introduces a model that predicts d-wave superconductivity with high critical temperature in cuprates.

Findings

Explains flat bands, small quasiparticle bandwidths, and antiferromagnetic weight in cuprates.

Proposes a model with d_{x^2 - y^2} superconductivity and T_c around 100K.

Identifies optimal doping at approximately 15%.

Abstract

We review the results of an extensive investigation of photoemission spectral weight using electronic models for the high-Tc superconductors. Here we show that some recently reported unusual features of the cuprates namely the presence of (i) flat bands, (ii) small quasiparticle bandwidths, and (iii) antiferromagnetically induced weight, have all a natural explanation within the context of holes moving in the presence of robust antiferromagnetic correlations. Introducing interactions among the hole carriers, a model is constructed which has ${\rm d_{x^2 - y^2}}$ superconductivity, an optimal doping of $\sim 15\%$ (caused by the presence of a large density of states at the top of the valence band), and a critical temperature $\sim 100K$.