Electron-phonon coupling in potassium-doped graphene: Angle-resolved photoemission spectroscopy

TL;DR

This study investigates the electron-phonon interaction in potassium-doped graphene on Ir(111) using angle-resolved photoemission spectroscopy, revealing weak and isotropic coupling consistent with theoretical predictions.

Contribution

It provides experimental measurements of electron-phonon coupling strength in potassium-doped graphene, confirming theoretical calculations.

Findings

Weak and isotropic electron-phonon coupling observed

Mass enhancement parameter lambda = 0.28(6)

Results agree with first principles calculations

Abstract

The electron-phonon coupling in potassium-doped graphene on Ir(111) is studied via the renormalization of the pi* band near the Fermi level, using angle-resolved photoemission spectroscopy. The renormalization is found to be fairly weak and almost isotropic, with a mass enhancement parameter of lambda= 0.28(6) for both the K-M and the K-G direction. These results are found to agree well with recent first principles calculations.