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Plasmon Excitations of Multi-layer Graphene on a Conducting Substrate
We predict the existence of low-frequency nonlocal plasmons at the vacuum-surface interface of a superlattice of N graphene layers interacting with conducting substrate. We derive a dispersion function that incorporates the polarization function of both the graphene monolayers and the semi-infinite...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4756674/ https://www.ncbi.nlm.nih.gov/pubmed/26883086 http://dx.doi.org/10.1038/srep21063 |
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author | Gumbs, Godfrey Iurov, Andrii Wu, Jhao-Ying Lin, M. F. Fekete, Paula |
author_facet | Gumbs, Godfrey Iurov, Andrii Wu, Jhao-Ying Lin, M. F. Fekete, Paula |
author_sort | Gumbs, Godfrey |
collection | PubMed |
description | We predict the existence of low-frequency nonlocal plasmons at the vacuum-surface interface of a superlattice of N graphene layers interacting with conducting substrate. We derive a dispersion function that incorporates the polarization function of both the graphene monolayers and the semi-infinite electron liquid at whose surface the electrons scatter specularly. We find a surface plasmon-polariton that is not damped by particle-hole excitations or the bulk modes and which separates below the continuum mini-band of bulk plasmon modes. The surface plasmon frequency of the hybrid structure always lies below [Image: see text], the surface plasmon frequency of the conducting substrate. The intensity of this mode depends on the distance of the graphene layers from the conductor’s surface, the energy band gap between valence and conduction bands of graphene monolayer and, most importantly, on the number of two-dimensional layers. For a sufficiently large number of layers [Image: see text] the hybrid structure has no surface plasmon. The existence of plasmons with different dispersion relations indicates that quasiparticles with different group velocity may coexist for various ranges of wavelengths determined by the number of layers in the superlattice. |
format | Online Article Text |
id | pubmed-4756674 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-47566742016-02-25 Plasmon Excitations of Multi-layer Graphene on a Conducting Substrate Gumbs, Godfrey Iurov, Andrii Wu, Jhao-Ying Lin, M. F. Fekete, Paula Sci Rep Article We predict the existence of low-frequency nonlocal plasmons at the vacuum-surface interface of a superlattice of N graphene layers interacting with conducting substrate. We derive a dispersion function that incorporates the polarization function of both the graphene monolayers and the semi-infinite electron liquid at whose surface the electrons scatter specularly. We find a surface plasmon-polariton that is not damped by particle-hole excitations or the bulk modes and which separates below the continuum mini-band of bulk plasmon modes. The surface plasmon frequency of the hybrid structure always lies below [Image: see text], the surface plasmon frequency of the conducting substrate. The intensity of this mode depends on the distance of the graphene layers from the conductor’s surface, the energy band gap between valence and conduction bands of graphene monolayer and, most importantly, on the number of two-dimensional layers. For a sufficiently large number of layers [Image: see text] the hybrid structure has no surface plasmon. The existence of plasmons with different dispersion relations indicates that quasiparticles with different group velocity may coexist for various ranges of wavelengths determined by the number of layers in the superlattice. Nature Publishing Group 2016-02-17 /pmc/articles/PMC4756674/ /pubmed/26883086 http://dx.doi.org/10.1038/srep21063 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/ |
spellingShingle | Article Gumbs, Godfrey Iurov, Andrii Wu, Jhao-Ying Lin, M. F. Fekete, Paula Plasmon Excitations of Multi-layer Graphene on a Conducting Substrate |
title | Plasmon Excitations of Multi-layer Graphene on a Conducting Substrate |
title_full | Plasmon Excitations of Multi-layer Graphene on a Conducting Substrate |
title_fullStr | Plasmon Excitations of Multi-layer Graphene on a Conducting Substrate |
title_full_unstemmed | Plasmon Excitations of Multi-layer Graphene on a Conducting Substrate |
title_short | Plasmon Excitations of Multi-layer Graphene on a Conducting Substrate |
title_sort | plasmon excitations of multi-layer graphene on a conducting substrate |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4756674/ https://www.ncbi.nlm.nih.gov/pubmed/26883086 http://dx.doi.org/10.1038/srep21063 |
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