We report direct measurements via angle-resolved photoemission spectroscopy (ARPES) of the electronic dispersion of single-layer CoO2. The Fermi contour consists of a large hole pocket centered at the Γ point. To interpret the ARPES results, we use density functional theory (DFT) in combination with the multi-orbital Gutzwiller Approximation (DFT+GA), basing our calculations on crystalline structure parameters derived from x-ray photoelectron diffraction and low-energy electron diffraction. Our calculations are in good agreement with the measured dispersion. We conclude that the material is a moderately correlated metal. We also discuss substrate effects, and the influence of hydroxylation on the CoO2 single-layer electronic structure.
@article{arxiv.2104.02791,
title = {Electronic Properties of Single-Layer CoO$_2$/Au(111)},
author = {Ann Julie U. Holt and Sahar Pakdel and Jonathan Rodríguez-Fernández and Yu Zhang and Davide Curcio and Zhaozong Sun and Paolo Lacovig and Yong-Xin Yao and Jeppe V. Lauritsen and Silvano Lizzit and Nicola Lanatà and Philip Hofmann and Marco Bianchi and Charlotte E. Sanders},
journal= {arXiv preprint arXiv:2104.02791},
year = {2021}
}