Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111)

We investigate the electronic properties of graphene nanoflakes on Ag(111) and Au(111) surfaces by means of scanning tunneling microscopy and spectroscopy as well as density functional theory calculations. Quasiparticle interference mapping allows for the clear distinction of substrate-derived contr...

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Main Authors:	Tesch, Julia, Leicht, Philipp, Blumenschein, Felix, Gragnaniello, Luca, Fonin, Mikhail, Marsoner Steinkasserer, Lukas Eugen, Paulus, Beate, Voloshina, Elena, Dedkov, Yuriy
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4802307/

id	pubmed-4802307
recordtype	oai_dc
spelling	pubmed-48023072016-03-23 Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111) Tesch, Julia Leicht, Philipp Blumenschein, Felix Gragnaniello, Luca Fonin, Mikhail Marsoner Steinkasserer, Lukas Eugen Paulus, Beate Voloshina, Elena Dedkov, Yuriy Article We investigate the electronic properties of graphene nanoflakes on Ag(111) and Au(111) surfaces by means of scanning tunneling microscopy and spectroscopy as well as density functional theory calculations. Quasiparticle interference mapping allows for the clear distinction of substrate-derived contributions in scattering and those originating from graphene nanoflakes. Our analysis shows that the parabolic dispersion of Au(111) and Ag(111) surface states remains unchanged with the band minimum shifted to higher energies for the regions of the metal surface covered by graphene, reflecting a rather weak interaction between graphene and the metal surface. The analysis of graphene-related scattering on single nanoflakes yields a linear dispersion relation E(k), with a slight p-doping for graphene/Au(111) and a larger n-doping for graphene/Ag(111). The obtained experimental data (doping level, band dispersions around EF, and Fermi velocity) are very well reproduced within DFT-D2/D3 approaches, which provide a detailed insight into the site-specific interaction between graphene and the underlying substrate. Nature Publishing Group 2016-03-22 /pmc/articles/PMC4802307/ /pubmed/27002297 http://dx.doi.org/10.1038/srep23439 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Tesch, Julia Leicht, Philipp Blumenschein, Felix Gragnaniello, Luca Fonin, Mikhail Marsoner Steinkasserer, Lukas Eugen Paulus, Beate Voloshina, Elena Dedkov, Yuriy
spellingShingle	Tesch, Julia Leicht, Philipp Blumenschein, Felix Gragnaniello, Luca Fonin, Mikhail Marsoner Steinkasserer, Lukas Eugen Paulus, Beate Voloshina, Elena Dedkov, Yuriy Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111)
author_facet	Tesch, Julia Leicht, Philipp Blumenschein, Felix Gragnaniello, Luca Fonin, Mikhail Marsoner Steinkasserer, Lukas Eugen Paulus, Beate Voloshina, Elena Dedkov, Yuriy
author_sort	Tesch, Julia
title	Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111)
title_short	Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111)
title_full	Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111)
title_fullStr	Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111)
title_full_unstemmed	Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111)
title_sort	structural and electronic properties of graphene nanoflakes on au(111) and ag(111)
description	We investigate the electronic properties of graphene nanoflakes on Ag(111) and Au(111) surfaces by means of scanning tunneling microscopy and spectroscopy as well as density functional theory calculations. Quasiparticle interference mapping allows for the clear distinction of substrate-derived contributions in scattering and those originating from graphene nanoflakes. Our analysis shows that the parabolic dispersion of Au(111) and Ag(111) surface states remains unchanged with the band minimum shifted to higher energies for the regions of the metal surface covered by graphene, reflecting a rather weak interaction between graphene and the metal surface. The analysis of graphene-related scattering on single nanoflakes yields a linear dispersion relation E(k), with a slight p-doping for graphene/Au(111) and a larger n-doping for graphene/Ag(111). The obtained experimental data (doping level, band dispersions around EF, and Fermi velocity) are very well reproduced within DFT-D2/D3 approaches, which provide a detailed insight into the site-specific interaction between graphene and the underlying substrate.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4802307/
_version_	1613555865174933504

Structural and electronic properties of graphene nanoflakes on Au(111) and Ag(111)

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