Spatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas

Abstract Fundamental interest for 2D electron gas (2DEG) systems has been recently renewed with the advent of 2D materials and their potential high-impact applications in optoelectronics. Here, we investigate a 2DEG created by the electron transfer from a Ag adatom gas deposited on a Si(111) $$\sqrt...

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Autores principales:	F. Cheynis, S. Curiotto, F. Leroy, P. Müller
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9e653ef5ac014f35a7feafbc6d9da70b
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spelling	oai:doaj.org-article:9e653ef5ac014f35a7feafbc6d9da70b2021-12-02T15:05:38ZSpatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas10.1038/s41598-017-10300-62045-2322https://doaj.org/article/9e653ef5ac014f35a7feafbc6d9da70b2017-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-10300-6https://doaj.org/toc/2045-2322Abstract Fundamental interest for 2D electron gas (2DEG) systems has been recently renewed with the advent of 2D materials and their potential high-impact applications in optoelectronics. Here, we investigate a 2DEG created by the electron transfer from a Ag adatom gas deposited on a Si(111) $$\sqrt{{\bf{3}}}{\boldsymbol{\times }}\sqrt{{\bf{3}}}$$ 3 × 3 -Ag surface to an electronic surface state. Using low-energy electron microscopy (LEEM), we measure the Ag adatom gas concentration and the 2DEG-induced charge transfer. We demonstrate a linear dependence of the surface work function change on the Ag adatom gas concentration. A breakdown of the linear relationship is induced by the occurrence of the Ag adatom gas superstructure identified as Si(111) $$\sqrt{{\bf{21}}}{\boldsymbol{\times }}\sqrt{{\bf{21}}}$$ 21 × 21 -Ag only observed below room temperature. We evidence below room temperature a confinement of the 2DEG on atomic terraces characterised by spatial inhomogeneities of the 2DEG-induced charge transfer along with temporal fluctuations. These variations mirror the Ag adatom gas concentration changes induced by the growth of 3D Ag islands and the occurrence of an Ehrlich-Schwoebel diffusion barrier of 155 ± 10 meV.F. CheynisS. CuriottoF. LeroyP. MüllerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q F. Cheynis S. Curiotto F. Leroy P. Müller Spatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas
description	Abstract Fundamental interest for 2D electron gas (2DEG) systems has been recently renewed with the advent of 2D materials and their potential high-impact applications in optoelectronics. Here, we investigate a 2DEG created by the electron transfer from a Ag adatom gas deposited on a Si(111) $$\sqrt{{\bf{3}}}{\boldsymbol{\times }}\sqrt{{\bf{3}}}$$ 3 × 3 -Ag surface to an electronic surface state. Using low-energy electron microscopy (LEEM), we measure the Ag adatom gas concentration and the 2DEG-induced charge transfer. We demonstrate a linear dependence of the surface work function change on the Ag adatom gas concentration. A breakdown of the linear relationship is induced by the occurrence of the Ag adatom gas superstructure identified as Si(111) $$\sqrt{{\bf{21}}}{\boldsymbol{\times }}\sqrt{{\bf{21}}}$$ 21 × 21 -Ag only observed below room temperature. We evidence below room temperature a confinement of the 2DEG on atomic terraces characterised by spatial inhomogeneities of the 2DEG-induced charge transfer along with temporal fluctuations. These variations mirror the Ag adatom gas concentration changes induced by the growth of 3D Ag islands and the occurrence of an Ehrlich-Schwoebel diffusion barrier of 155 ± 10 meV.
format	article
author	F. Cheynis S. Curiotto F. Leroy P. Müller
author_facet	F. Cheynis S. Curiotto F. Leroy P. Müller
author_sort	F. Cheynis
title	Spatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas
title_short	Spatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas
title_full	Spatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas
title_fullStr	Spatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas
title_full_unstemmed	Spatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas
title_sort	spatial inhomogeneity and temporal dynamics of a 2d electron gas in interaction with a 2d adatom gas
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9e653ef5ac014f35a7feafbc6d9da70b
work_keys_str_mv	AT fcheynis spatialinhomogeneityandtemporaldynamicsofa2delectrongasininteractionwitha2dadatomgas AT scuriotto spatialinhomogeneityandtemporaldynamicsofa2delectrongasininteractionwitha2dadatomgas AT fleroy spatialinhomogeneityandtemporaldynamicsofa2delectrongasininteractionwitha2dadatomgas AT pmuller spatialinhomogeneityandtemporaldynamicsofa2delectrongasininteractionwitha2dadatomgas
_version_	1718388784179970048

Spatial inhomogeneity and temporal dynamics of a 2D electron gas in interaction with a 2D adatom gas

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