Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au

Abstract We investigate the effects of native Si adatoms on structural and electronic properties of the Si(111)5 × 2-Au surface, a representative one-dimensional metal-chain system, by means of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. High-resolution STM...

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Autores principales:	Eui Hwan Do, Se Gab Kwon, Myung Ho Kang, Han Woong Yeom
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Metallic Band Neighboring Unit Cells Scanning Tunneling Microscopy (STM) Atomic-scale Understanding Structural Distortion Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a8b48432e074466d911d904d7959f7bb
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spelling	oai:doaj.org-article:a8b48432e074466d911d904d7959f7bb2021-12-02T15:08:12ZStructural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au10.1038/s41598-018-33703-52045-2322https://doaj.org/article/a8b48432e074466d911d904d7959f7bb2018-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-33703-5https://doaj.org/toc/2045-2322Abstract We investigate the effects of native Si adatoms on structural and electronic properties of the Si(111)5 × 2-Au surface, a representative one-dimensional metal-chain system, by means of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. High-resolution STM images of relatively long adatom-free chain segments evidence directly the inherent ×2 reconstruction, which is the essential part of a recently proposed structural model based on a renewed Au coverage of 0.7 monolayer. On the other hand, STM images for chain segments of different lengths reveal that the structural distortion induced by Si adatoms is confined in neighboring unit cells, in good agreement with DFT calculations based on that model. Si adatoms greatly affect the metallic bands of Au chains, one of which becomes fully occupied and represents a tightly confined electronic state to the distortion around Si adatoms, potentially forming short insulating segments within metallic chains. This finding provides an atomic-scale understanding of the observed gradual metal-insulator transition and atomic-scale phase separation induced by Si adatoms.Eui Hwan DoSe Gab KwonMyung Ho KangHan Woong YeomNature PortfolioarticleMetallic BandNeighboring Unit CellsScanning Tunneling Microscopy (STM)Atomic-scale UnderstandingStructural DistortionMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-7 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Metallic Band Neighboring Unit Cells Scanning Tunneling Microscopy (STM) Atomic-scale Understanding Structural Distortion Medicine R Science Q
spellingShingle	Metallic Band Neighboring Unit Cells Scanning Tunneling Microscopy (STM) Atomic-scale Understanding Structural Distortion Medicine R Science Q Eui Hwan Do Se Gab Kwon Myung Ho Kang Han Woong Yeom Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au
description	Abstract We investigate the effects of native Si adatoms on structural and electronic properties of the Si(111)5 × 2-Au surface, a representative one-dimensional metal-chain system, by means of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. High-resolution STM images of relatively long adatom-free chain segments evidence directly the inherent ×2 reconstruction, which is the essential part of a recently proposed structural model based on a renewed Au coverage of 0.7 monolayer. On the other hand, STM images for chain segments of different lengths reveal that the structural distortion induced by Si adatoms is confined in neighboring unit cells, in good agreement with DFT calculations based on that model. Si adatoms greatly affect the metallic bands of Au chains, one of which becomes fully occupied and represents a tightly confined electronic state to the distortion around Si adatoms, potentially forming short insulating segments within metallic chains. This finding provides an atomic-scale understanding of the observed gradual metal-insulator transition and atomic-scale phase separation induced by Si adatoms.
format	article
author	Eui Hwan Do Se Gab Kwon Myung Ho Kang Han Woong Yeom
author_facet	Eui Hwan Do Se Gab Kwon Myung Ho Kang Han Woong Yeom
author_sort	Eui Hwan Do
title	Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au
title_short	Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au
title_full	Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au
title_fullStr	Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au
title_full_unstemmed	Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au
title_sort	structural and electronic effects of adatoms on metallic atomic chains in si(111)5 × 2-au
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/a8b48432e074466d911d904d7959f7bb
work_keys_str_mv	AT euihwando structuralandelectroniceffectsofadatomsonmetallicatomicchainsinsi11152au AT segabkwon structuralandelectroniceffectsofadatomsonmetallicatomicchainsinsi11152au AT myunghokang structuralandelectroniceffectsofadatomsonmetallicatomicchainsinsi11152au AT hanwoongyeom structuralandelectroniceffectsofadatomsonmetallicatomicchainsinsi11152au
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Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au

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