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O: Fachverband Oberflächenphysik
O 10: Oxides I: Growth and Characterization
O 10.3: Talk
Monday, March 16, 2020, 11:00–11:15, WIL B321
Structural and electronic properties of single-layer CoO2 — •Ann-Julie Holt1, Marco Bianchi1, Jonathan Fernandez2, Yu Zhang3, Davide Curcio1, Paolo Lacovig4, Sahar Pakdel1, Nicola Lanata1, Jeppe Lauritsen2, Silvano Lizzit4, Philip Hofmann1, and Charlotte Sanders3 — 1Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark — 2Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark — 3Central Laser Facility, Oxfordshire, UK — 4Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy.
Single-layer transition metal dichalcogens are among the most actively investigated material systems of the past several years and increased attention is now being directed to the oxygen-based members of this family. In particular, CoO2 is predicted to manifest intrinsic two-dimensional ferromagnetism and is a potential corrosion-resistant catalyst in the oxygen evolution reaction.
Here, we present an experimental study of single-layer CoO2, obtained from a newly developed synthesis method for epitaxially fabricating stable, rotationally aligned single-layer CoO2 on Au(111) (e.g.,[1]). The material structure is studied through scanning tunneling microscopy, low energy electron diffraction, and X-ray photoelectron diffraction. The electronic dispersion is characterised by the use of angle-resolved photoelectron spectroscopy, revealing a metallic behaviour. A structural model of the material is established, and the electronic structure is related to density functional theory calculations. [1] ACS Nano 9 (2015) 2445