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Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 10: Oxides I: Growth and Characterization

O 10.3: Vortrag

Montag, 16. März 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 Sanders31Department 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

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