Electron-phonon coupling and its evidence in the photoemission spectra of lead

TL;DR

This paper investigates how strong electron-phonon interactions in lead influence its photoemission spectra, revealing features consistent with Eliashberg theory and superconductivity, using high-resolution spectrometry.

Contribution

It provides experimental evidence of electron-phonon coupling effects in lead's photoemission spectra aligned with theoretical predictions.

Findings

Spectral features indicative of strong electron-phonon coupling

Evidence of normal and superconducting state correspondence

Observation of features on a few meV energy scale

Abstract

We present a detailed study on the influence of strong electron-phonon coupling to the photoemission spectra of lead. Representing the strong-coupling regime of superconductivity, the spectra of lead show characteristic features that demonstrate the correspondence of physical properties in the normal and the superconducting state, as predicted by the Eliashberg theory. These features appear on an energy scale of a few meV and are accessible for photoemission only by using modern spectrometers with high resolution in energy and angle.