Thermal Effects in Photoemission and Electron-Phonon Couplings of Fullerene

TL;DR

This paper demonstrates that thermal effects significantly influence the measurement of electron-phonon couplings in fullerene, leading to a roughly 10% reduction in coupling values when properly accounted for in photoemission spectra analysis.

Contribution

It introduces a correction for thermal effects in the analysis of photoemission spectra, refining the electron-phonon coupling estimates for fullerene.

Findings

Thermal effects reduce estimated electron-phonon couplings by about 10%.

Re-analysis of C60 photoemission spectra with thermal considerations improves accuracy.

Thermal effects are crucial for precise electron-phonon interaction measurements.

Abstract

We show that thermal effects play a relevant role in the determination of the electron-phonon couplings based on the intensity of the phonon-shakeup peaks in photoemission spectra. In particular, we re-consider the determination of the electron-phonon couplings of fullerene based on a fit of the photoemission spectrum of C60- in gas phase [Gunnarsson PRB 1995]. We show that taking thermal effects into account reduces the obtained couplings by approximately 10%.