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Behavior of the Energy Spectrum and Electric Conduction of Doped Graphene
We consider the effect of atomic impurities on the energy spectrum and electrical conductance of graphene. As is known, the ordering of atomic impurities at the nodes of a crystal lattice modifies the graphene spectrum of energy, yielding a gap in it. Assuming a Fermi level within the gap domain, th...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7178708/ https://www.ncbi.nlm.nih.gov/pubmed/32268603 http://dx.doi.org/10.3390/ma13071718 |
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author | Bellucci, Stefano Kruchinin, Sergei Repetsky, Stanislav P. Vyshyvana, Iryna G. Melnyk, Ruslan |
author_facet | Bellucci, Stefano Kruchinin, Sergei Repetsky, Stanislav P. Vyshyvana, Iryna G. Melnyk, Ruslan |
author_sort | Bellucci, Stefano |
collection | PubMed |
description | We consider the effect of atomic impurities on the energy spectrum and electrical conductance of graphene. As is known, the ordering of atomic impurities at the nodes of a crystal lattice modifies the graphene spectrum of energy, yielding a gap in it. Assuming a Fermi level within the gap domain, the electrical conductance diverges at the ordering of graphene. Hence, we can conclude about the presence of a metal–dielectric transition. On the other hand, for a Fermi level occurring outside of the gap, we see an increase in the electrical conductance as a function of the order parameter. The analytic formulas obtained in the Lifshitz one-electron strong-coupling model, describing the one-electron states of graphene doped with substitutional impurity atoms in the limiting case of weak scattering, are compared to the results of numerical calculations. To determine the dependence of the energy spectrum and electrical conductance on the order parameter, we consider both the limiting case of weak scattering and the case of finite scattering potential. The contributions of the scattering of electrons on a vapor of atoms to the density of states and the electrical conductance of graphene with an admixture of interstitial atoms are studied within numerical methods. It is shown that an increase in the electrical conductance with the order parameter is a result of both the growth of the density of states at the Fermi level and the time of relaxation of electron states. We have demonstrated the presence of a domain of localized extrinsic states on the edges of the energy gap arising at the ordering of atoms of the admixture. If the Fermi level falls in the indicated spectral regions, the electrical conductance of graphene is significantly affected by the scattering of electrons on clusters of two or more atoms, and the approximation of coherent potential fails in this case. |
format | Online Article Text |
id | pubmed-7178708 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-71787082020-04-28 Behavior of the Energy Spectrum and Electric Conduction of Doped Graphene Bellucci, Stefano Kruchinin, Sergei Repetsky, Stanislav P. Vyshyvana, Iryna G. Melnyk, Ruslan Materials (Basel) Article We consider the effect of atomic impurities on the energy spectrum and electrical conductance of graphene. As is known, the ordering of atomic impurities at the nodes of a crystal lattice modifies the graphene spectrum of energy, yielding a gap in it. Assuming a Fermi level within the gap domain, the electrical conductance diverges at the ordering of graphene. Hence, we can conclude about the presence of a metal–dielectric transition. On the other hand, for a Fermi level occurring outside of the gap, we see an increase in the electrical conductance as a function of the order parameter. The analytic formulas obtained in the Lifshitz one-electron strong-coupling model, describing the one-electron states of graphene doped with substitutional impurity atoms in the limiting case of weak scattering, are compared to the results of numerical calculations. To determine the dependence of the energy spectrum and electrical conductance on the order parameter, we consider both the limiting case of weak scattering and the case of finite scattering potential. The contributions of the scattering of electrons on a vapor of atoms to the density of states and the electrical conductance of graphene with an admixture of interstitial atoms are studied within numerical methods. It is shown that an increase in the electrical conductance with the order parameter is a result of both the growth of the density of states at the Fermi level and the time of relaxation of electron states. We have demonstrated the presence of a domain of localized extrinsic states on the edges of the energy gap arising at the ordering of atoms of the admixture. If the Fermi level falls in the indicated spectral regions, the electrical conductance of graphene is significantly affected by the scattering of electrons on clusters of two or more atoms, and the approximation of coherent potential fails in this case. MDPI 2020-04-06 /pmc/articles/PMC7178708/ /pubmed/32268603 http://dx.doi.org/10.3390/ma13071718 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Bellucci, Stefano Kruchinin, Sergei Repetsky, Stanislav P. Vyshyvana, Iryna G. Melnyk, Ruslan Behavior of the Energy Spectrum and Electric Conduction of Doped Graphene |
title | Behavior of the Energy Spectrum and Electric Conduction of Doped Graphene |
title_full | Behavior of the Energy Spectrum and Electric Conduction of Doped Graphene |
title_fullStr | Behavior of the Energy Spectrum and Electric Conduction of Doped Graphene |
title_full_unstemmed | Behavior of the Energy Spectrum and Electric Conduction of Doped Graphene |
title_short | Behavior of the Energy Spectrum and Electric Conduction of Doped Graphene |
title_sort | behavior of the energy spectrum and electric conduction of doped graphene |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7178708/ https://www.ncbi.nlm.nih.gov/pubmed/32268603 http://dx.doi.org/10.3390/ma13071718 |
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