Electron Structure and Electric Conductivity of Graphene with a Nitrogen Impurity

Repetsky, S. P.; Третяк, О. В.; Vyshivanaya, I. G.

doi:10.15407/ujpe60.02.0170

Cited by 2 publications

(6 citation statements)

References 14 publications

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“…The trends are clearly that the relative conductance G(c)/G(0), estimated by the ration T(c)/T(0), decreases with increasing concentration with an average slope 0.19 when c is in at.%. This behavior is in agreement with the results of DFT calculations of graphene conductivity performed for higher N concentrations with the Kubo formula [23]. These calculations, in addition, pinpoint the dominant role played by the π electrons in the decrease of conductance with increasing doping.…”

Section: Resultssupporting

confidence: 89%

“…The Kubo-Greenwood formalism is better adapted to two-dimensional graphene then the Landauer-Büttiker approach is, but there is no systematic calculations of the conductance versus dopant concentration, except in Ref. [23] as already mentioned above.…”

Section: Resultsmentioning

confidence: 99%

“…The electronic properties of graphene doped with nitrogen atoms have been analyzed by several groups [16][17][18][19][20][21][22][23]. Substitutional N dopants shift the Fermi level above the Dirac energy, modify the electronic density of states and open a small band gap [16,17,19].…”

Section: Introductionmentioning

confidence: 99%

“…All these effects affect the conductivity of the samples in a non-trivial way. There are more carriers available for transport in these systems than in pure graphene but, on the other hand, scattering by the dopant atoms reduces the electron relaxation time [23] and, hence, the mobility.…”

Section: Introductionmentioning

confidence: 99%

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Scattering of Dirac Electrons by Randomly Distributed Nitrogen Substitutional Impurities in Graphene

2016

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Abstract:The propagation of wave packets in a monolayer graphene containing a random distribution of dopant atoms has been explored. The time-dependent, two-dimensional Weyl-Dirac equation was solved numerically to propagate an initial Gaussian-type wave front and to investigate how the set of impurities influences its motion. It has been observed that the charge transport in doped graphene differs from the pristine case. In particular, nitrogen substitutional doping reduces the charge mobility in graphene due to backscattering effects.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scattering of Dirac Electrons by Randomly Distributed Nitrogen Substitutional Impurities in Graphene

2016

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“…Graphenes with impurities of aluminium, silicon, phosphorus, and sulphur were studied within the analogous method in work [3], where it was shown, in particular, that graphene with a 3% impurity of phosphorus has a gap 0.67 eV in width. In work [4] with the use of the QUANTUM-ESPRESSO software, the possibilities of the opening of a gap in the energy spectrum of graphene at the introduction of the impurities of boron and nitrogen (the gap width is 0.49 eV), as well as the impurities of atoms of boron and atoms of lithium adsorbed on the surface (the gap width is 0.166 eV), were demonstrated.…”

Section: Introductionmentioning

confidence: 99%

The energy spectrum and the electrical conductivity of graphene with substitution impurity

Repetsky¹,

Vyshyvana²,

Kruchinin³

et al. 2020

Condens. Matter Phys.

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The effect of substitution atoms on the energy spectrum and the electrical conductivity of graphene was investigated in a Lifshitz one-electron tight-binding model. It is established that the ordering of impurity atoms results in a gap in the energy spectrum of electrons whose width depends on the order parameter and on the magnitude of the scattering potential. It is shown that if the order parameter is close to its maximum value, there are peaks associated with localized impurity states on the energy curve of the electron states density at the edges of the energy gap. At the electron concentration at which the Fermi level enters the gap region, the electrical conductivity is zero, and the metal-dielectric transition occurs. If the Fermi level falls in the region of the energy band, the electron relaxation time and electrical conductivity tend to infinity when the order parameter reaches its maximum value. The analytical calculations of the electron density and of the electrical conductivity of graphene, made in the limiting case of weak scattering, are compared with the results of the numerical calculations for different scattering potentials.

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Electron Structure and Electric Conductivity of Graphene with a Nitrogen Impurity

Cited by 2 publications

References 14 publications

Scattering of Dirac Electrons by Randomly Distributed Nitrogen Substitutional Impurities in Graphene

Scattering of Dirac Electrons by Randomly Distributed Nitrogen Substitutional Impurities in Graphene

The energy spectrum and the electrical conductivity of graphene with substitution impurity

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