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New insight on the role of localisation in the electronic structure of the Si(111)(7 × 7) surfaces
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Dávila, M. E., Avila, J., Colambo, I. R., Putungan, D. B., Woodruff, D. P. and Asensio, M. C. (2021) New insight on the role of localisation in the electronic structure of the Si(111)(7 × 7) surfaces. Scientific Reports, 11 (1). 15034. doi:10.1038/s41598-021-94664-w ISSN 2045-2322.
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Official URL: http://dx.doi.org/10.1038/s41598-021-94664-w
Abstract
New angle-resolved photoelectron spectroscopy (ARPES) data, recorded at several different photon energies from the Si(111)(7 × 7) surface, show that the well-known S1 and S2 surface states that lie in the bulk band gap are localised at specific (adatom and rest atom) sites on the reconstructed surface. The variations in the photoemission intensity from these states as a function of polar and azimuthal emission angle, and incident photon energy, are not consistent with Fermi surface mapping but are well-described by calculations of the multiple elastic scattering in the final state. This localisation of the most shallowly bound S1 state is consistent with the lack of significant dispersion, with no evidence of Fermi surface crossing, implying that the surface is not, as has been previously proposed, metallic in character. Our findings highlight the importance of final state scattering in interpreting ARPES data, an aspect that is routinely ignored and can lead to misleading conclusions.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Photoelectron spectroscopy , Emission spectroscopy , Semiconductors -- Materials, Fermi surfaces | ||||||
Journal or Publication Title: | Scientific Reports | ||||||
Publisher: | Nature Publishing Group | ||||||
ISSN: | 2045-2322 | ||||||
Official Date: | 22 July 2021 | ||||||
Dates: |
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Volume: | 11 | ||||||
Number: | 1 | ||||||
Article Number: | 15034 | ||||||
DOI: | 10.1038/s41598-021-94664-w | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 23 July 2021 | ||||||
Date of first compliant Open Access: | 23 July 2021 | ||||||
RIOXX Funder/Project Grant: |
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