Strocov, VN;
Lev, LL;
Alarab, F;
Constantinou, P;
Wang, X;
Schmitt, T;
Stock, TJZ;
... Minár, J; + view all
(2023)
High-energy photoemission final states beyond the free-electron approximation.
Nature Communications
, 14
(1)
, Article 4827. 10.1038/s41467-023-40432-5.
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Abstract
Three-dimensional (3D) electronic band structure is fundamental for understanding a vast diversity of physical phenomena in solid-state systems, including topological phases, interlayer interactions in van der Waals materials, dimensionality-driven phase transitions, etc. Interpretation of ARPES data in terms of 3D electron dispersions is commonly based on the free-electron approximation for the photoemission final states. Our soft-X-ray ARPES data on Ag metal reveals, however, that even at high excitation energies the final states can be a way more complex, incorporating several Bloch waves with different out-of-plane momenta. Such multiband final states manifest themselves as a complex structure and added broadening of the spectral peaks from 3D electron states. We analyse the origins of this phenomenon, and trace it to other materials such as Si and GaN. Our findings are essential for accurate determination of the 3D band structure over a wide range of materials and excitation energies in the ARPES experiment.
| Type: | Article |
|---|---|
| Title: | High-energy photoemission final states beyond the free-electron approximation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/s41467-023-40432-5 |
| Publisher version: | https://doi.org/10.1038/s41467-023-40432-5 |
| Language: | English |
| Additional information: | © 2023 Springer Nature Limited. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10175261 |
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