Angle resolved Cu and O photoemission intensities in CuO_2 planes

TL;DR

This paper investigates the momentum-dependent photoemission intensities of copper and oxygen in cuprate superconductors using a combination of theoretical models and numerical methods, providing insights for experimental interpretation.

Contribution

It introduces a mapping from a three-band Hubbard model to a generalized t-J model and derives an analytical expression relating oxygen intensity to quasiparticle weight.

Findings

O intensity vanishes at k=(0,0).

Cu and O intensities show markedly different k-dependence.

Provides a theoretical framework for interpreting ARPES data.

Abstract

Using a mapping from the three-band extended Hubbard model for cuprate superconductors into a generalized t-J model, and exact diagonalization of the latter in a 4x4 cluster, we determine the quasiparticle weight for destruction of a Cu or an O electrons with definite wave vector k. We also derive an approximate but accurate analytical expression which relates the O intensity with the quasiparticle weight in the generalized t-J model, and use it to obtain the O intensity from results of the self-consistent Born approximation. The k-dependence of Cu and O intensities is markedly different. In particular the O intensity vanishes for k=(0,0). Our results are relevant for the interpretation of angle-resolved photoemission experiments.