Self-consistent Born approximation for the hole motion in the three-band model: a comparison with photoemission experiments

TL;DR

This paper uses the self-consistent Born approximation to calculate the hole dispersion in a three-band model of the CuO2 plane, showing good agreement with photoemission experiments and highlighting the role of oxygen-oxygen hopping.

Contribution

It introduces a detailed calculation of hole dispersion in the three-band model, emphasizing the impact of oxygen-oxygen hopping on spectral anisotropy, and compares results with experimental data.

Findings

Oxygen-oxygen hopping reduces anisotropy in hole spectrum

Calculated dispersion matches photoemission data in Sr2CuO2Cl2

Self-consistent Born approximation effectively models hole dynamics

Abstract

The dispersion relation of the single hole in the $CuO_2$ plane is calculated in the self-consistent Born approximation for the three-band Hamiltonian. We find that direct oxygen-oxygen hopping removes the strong anisotropy of the hole spectrum around the band minima. Our results compare well with recent photoemission measurements of the single-hole dispersion relation in $Sr_2 CuO_2 Cl_2$.