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Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms
Scanning tunneling microscopy measurements of height profiles, along the chains of Si atoms on the terrace edges of a perfectly ordered Si(553)-Au surface, reveal an STM bias-dependent mixed periodicity with periods of one, two and one and a half lattice constants. The simple linear chain model usua...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10488472/ https://www.ncbi.nlm.nih.gov/pubmed/37687737 http://dx.doi.org/10.3390/ma16176044 |
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author | Jałochowski, Mieczysław Kwapiński, Tomasz |
author_facet | Jałochowski, Mieczysław Kwapiński, Tomasz |
author_sort | Jałochowski, Mieczysław |
collection | PubMed |
description | Scanning tunneling microscopy measurements of height profiles, along the chains of Si atoms on the terrace edges of a perfectly ordered Si(553)-Au surface, reveal an STM bias-dependent mixed periodicity with periods of one, two and one and a half lattice constants. The simple linear chain model usually observed with STM cannot explain the unexpected fractional periodicity in the height profile. It was found that the edge Si chain stands for, in fact, a zigzag structure, which is composed of two neighboring rows of Si atoms and was detected in the STM experiments. Tight-binding calculations of the local density of states and charge occupancy along the chain explain the voltage-dependent modulations of the STM profiles and show that oscillation periods are determined mainly by the surface and STM tip Fermi energies. |
format | Online Article Text |
id | pubmed-10488472 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-104884722023-09-09 Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms Jałochowski, Mieczysław Kwapiński, Tomasz Materials (Basel) Article Scanning tunneling microscopy measurements of height profiles, along the chains of Si atoms on the terrace edges of a perfectly ordered Si(553)-Au surface, reveal an STM bias-dependent mixed periodicity with periods of one, two and one and a half lattice constants. The simple linear chain model usually observed with STM cannot explain the unexpected fractional periodicity in the height profile. It was found that the edge Si chain stands for, in fact, a zigzag structure, which is composed of two neighboring rows of Si atoms and was detected in the STM experiments. Tight-binding calculations of the local density of states and charge occupancy along the chain explain the voltage-dependent modulations of the STM profiles and show that oscillation periods are determined mainly by the surface and STM tip Fermi energies. MDPI 2023-09-02 /pmc/articles/PMC10488472/ /pubmed/37687737 http://dx.doi.org/10.3390/ma16176044 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Jałochowski, Mieczysław Kwapiński, Tomasz Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms |
title | Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms |
title_full | Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms |
title_fullStr | Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms |
title_full_unstemmed | Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms |
title_short | Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms |
title_sort | distribution of electron density in self-assembled one-dimensional chains of si atoms |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10488472/ https://www.ncbi.nlm.nih.gov/pubmed/37687737 http://dx.doi.org/10.3390/ma16176044 |
work_keys_str_mv | AT jałochowskimieczysław distributionofelectrondensityinselfassembledonedimensionalchainsofsiatoms AT kwapinskitomasz distributionofelectrondensityinselfassembledonedimensionalchainsofsiatoms |