### Resumen

A theoretical study of electronic and optical properties of graphene nanodisks and nanocones is presented within the framework of a tight-binding scheme. The electronic densities of states and absorption coefficients are calculated for such structures with different sizes and topologies. A discrete position approximation is used to describe the electronic states taking into account the effect of the overlap integral to first order. For small finite systems, both total and local densities of states depend sensitively on the number of atoms and characteristic geometry of the structures. Results for the local densities of charge reveal a finite charge distribution around some atoms at the apices and borders of the cone structures. For structures with more than 5,000 atoms, the contribution to the total density of states near the Fermi level essentially comes from states localized at the edges. For other energies, the average density of states exhibits similar features to the case of a graphene lattice. Results for the absorption spectra of nanocones show a peculiar dependence on the photon polarization in the infrared range for all investigated structures.

Idioma original | English |
---|---|

Páginas (desde-hasta) | 1-9 |

Número de páginas | 9 |

Publicación | Nanoscale Research Letters |

Volumen | 8 |

N.º | 1 |

DOI | |

Estado | Published - 14 nov 2013 |

### Huella dactilar

### ASJC Scopus subject areas

- Materials Science(all)
- Condensed Matter Physics

### Citar esto

*Nanoscale Research Letters*,

*8*(1), 1-9. https://doi.org/10.1186/1556-276X-8-384

}

*Nanoscale Research Letters*, vol. 8, n.º 1, pp. 1-9. https://doi.org/10.1186/1556-276X-8-384

**Cone-like graphene nanostructures : Electronic and optical properties.** / Ulloa, Pablo; Latgé, Andrea; Oliveira, Luiz E.; Pacheco, Monica.

Resultado de la investigación: Article

TY - JOUR

T1 - Cone-like graphene nanostructures

T2 - Electronic and optical properties

AU - Ulloa, Pablo

AU - Latgé, Andrea

AU - Oliveira, Luiz E.

AU - Pacheco, Monica

PY - 2013/11/14

Y1 - 2013/11/14

N2 - A theoretical study of electronic and optical properties of graphene nanodisks and nanocones is presented within the framework of a tight-binding scheme. The electronic densities of states and absorption coefficients are calculated for such structures with different sizes and topologies. A discrete position approximation is used to describe the electronic states taking into account the effect of the overlap integral to first order. For small finite systems, both total and local densities of states depend sensitively on the number of atoms and characteristic geometry of the structures. Results for the local densities of charge reveal a finite charge distribution around some atoms at the apices and borders of the cone structures. For structures with more than 5,000 atoms, the contribution to the total density of states near the Fermi level essentially comes from states localized at the edges. For other energies, the average density of states exhibits similar features to the case of a graphene lattice. Results for the absorption spectra of nanocones show a peculiar dependence on the photon polarization in the infrared range for all investigated structures.

AB - A theoretical study of electronic and optical properties of graphene nanodisks and nanocones is presented within the framework of a tight-binding scheme. The electronic densities of states and absorption coefficients are calculated for such structures with different sizes and topologies. A discrete position approximation is used to describe the electronic states taking into account the effect of the overlap integral to first order. For small finite systems, both total and local densities of states depend sensitively on the number of atoms and characteristic geometry of the structures. Results for the local densities of charge reveal a finite charge distribution around some atoms at the apices and borders of the cone structures. For structures with more than 5,000 atoms, the contribution to the total density of states near the Fermi level essentially comes from states localized at the edges. For other energies, the average density of states exhibits similar features to the case of a graphene lattice. Results for the absorption spectra of nanocones show a peculiar dependence on the photon polarization in the infrared range for all investigated structures.

KW - Graphene

KW - Nanocones

KW - Optical absorption

UR - http://www.scopus.com/inward/record.url?scp=84887309675&partnerID=8YFLogxK

U2 - 10.1186/1556-276X-8-384

DO - 10.1186/1556-276X-8-384

M3 - Article

AN - SCOPUS:84887309675

VL - 8

SP - 1

EP - 9

JO - Nanoscale Research Letters

JF - Nanoscale Research Letters

SN - 1931-7573

IS - 1

ER -