Electronic spectrum in cuprates within p-d Hubbard model

TL;DR

This paper develops a microscopic theory for the electronic spectrum of cuprates using an effective p-d Hubbard model, analyzing how doping and temperature affect electronic properties relevant to high-temperature superconductivity.

Contribution

It introduces a self-consistent solution for the Green function within the p-d Hubbard model, incorporating spin fluctuation effects via a dynamical susceptibility.

Findings

Doping and temperature significantly influence electron dispersions.

Spectral functions and Fermi surface evolve with doping and temperature.

The model captures key features of cuprate electronic spectra.

Abstract

A microscopic theory for electronic spectrum of the CuO2 plane within an effective p-d Hubbard model is proposed. Dyson equation for the one-electron Green function in terms of the Hubbard operators is derived which is solved self-consistently for the self-energy evaluated in the noncrossing approximation. Electron scattering on spin fluctuations induced by kinematical interaction is described by a model dynamical spin susceptibility. Doping and temperature dependence of electron dispersions, spectral functions, the Fermi surface and the coupling constant are studied.