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Metallic atomically-thin layered silicon epitaxially grown on silicene/ZrB2

Gill, TG; Fleurence, A; Warner, B; Prueser, H; Friedlein, R; Sadowski, JT; Hirjibehedin, CF; (2017) Metallic atomically-thin layered silicon epitaxially grown on silicene/ZrB2. 2D Materials , 4 (2) , Article 021015. 10.1088/2053-1583/aa5a80. Green open access

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Abstract

Using low energy electron diffraction (LEED) and scanning tunnelling microscopy (STM), we observe a new two-dimensional (2D) silicon crystal that is formed by depositing additional Si atoms onto spontaneously-formed epitaxial silicene on a ZrB2 thin film. From scanning tunnelling spectroscopy (STS) studies, we find that this atomically-thin layered silicon has distinctly different electronic properties. Angle resolved photoelectron spectroscopy (ARPES) reveals that, in sharp contrast to epitaxial silicene, the layered silicon exhibits significantly enhanced density of states at the Fermi level resulting from newly formed metallic bands. The 2D growth of this material could allow for direct contacting to the silicene surface and demonstrates the dramatic changes in electronic structure that can occur by the addition of even a single monolayer amount of material in 2D systems.

Type: Article
Title: Metallic atomically-thin layered silicon epitaxially grown on silicene/ZrB2
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/2053-1583/aa5a80
Publisher version: http://doi.org/10.1088/2053-1583/aa5a80
Language: English
Additional information: © 2017 IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Keywords: Silicene, scanning tunnelling microscopy (STM), low energy electron diffraction (LEED), silicon nanostructures
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1535470
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