Inversion of ARPES measurements in high Tc cuprates

TL;DR

This paper develops a method to invert ARPES data in high Tc cuprates to directly extract the bosonic spectral function, providing insights into electron-phonon interactions responsible for observed kinks.

Contribution

It introduces a novel inversion technique to analyze ARPES measurements, revealing the bosonic spectral features linked to electron-phonon coupling in cuprates.

Findings

Identified a singular function in the phonon energy region from ARPES data.

Provided direct evidence of electron-phonon coupling effects in high Tc cuprates.

Enhanced understanding of the origin of kinks in energy dispersion.

Abstract

Recent energy dispersion measurements in several families of the hole-doped copper oxides have revealed a kink in the energy vs. momentum relation. These have tentatively been identified as due to electron phonon coupling. We invert this data directly to determine the bosonic spectral function; the kink gives rise to a singular function in the phonon energy region.