Electronic spectrum in high-temperature cuprate superconductors

TL;DR

This paper develops a microscopic theory for the electronic spectrum in high-temperature cuprate superconductors, focusing on the CuO2 plane using an effective p-d Hubbard model and analyzing doping and temperature effects.

Contribution

It introduces a self-consistent solution for the Green function using Hubbard operators and accounts for spin fluctuations via a dynamical susceptibility.

Findings

Observation of arc-type Fermi surface at low doping

Identification of a pseudogap in spectral functions at low doping

Analysis of doping and temperature effects on electron dispersion

Abstract

A microscopic theory for electronic spectrum of the CuO2 plane within an effective p-d Hubbard model is proposed. Dyson equation for the single-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 kinematic interaction is described by a dynamical spin susceptibility with a continuous spectrum. Doping and temperature dependence of electron dispersions, spectral functions, the Fermi surface and the coupling constant are studied in the hole doped case. At low doping, an arc-type Fermi surface and a pseudogap in the spectral function are observed.