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

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Title
Structural and electronic effects of adatoms on metallic atomic chains in Si(111)5 × 2-Au
Author(s)
Eui Hwan Do; Se Gab Kwon; Myung Ho Kang; Han Woong Yeom
Publication Date
2018-10
Journal
SCIENTIFIC REPORTS, v.8, no.1, pp.15537 -
Publisher
NATURE PUBLISHING GROUP
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. © The Author(s) 2018
URI
https://pr.ibs.re.kr/handle/8788114/5117
ISSN
2045-2322
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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