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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cone-like graphene nanostructures: electronic and optical properties

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Author(s):
Ulloa, Pablo [1] ; Latge, Andrea [2] ; Oliveira, Luiz E. [3] ; Pacheco, Monica [1]
Total Authors: 4
Affiliation:
[1] Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso - Chile
[2] Univ Fed Fluminense, Inst Fis, BR-24210340 Niteroi, RJ - Brazil
[3] Univ Estadual Campinas UNICAMP, Inst Fis, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: NANOSCALE RESEARCH LETTERS; v. 8, SEP 12 2013.
Web of Science Citations: 5
Abstract

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. (AU)

FAPESP's process: 12/51691-0 - The physics of new materials and semiconductor nanostructures
Grantee:Luiz Eduardo Moreira Carvalho de Oliveira
Support type: Research Projects - Thematic Grants