Optical properties of graphene nanocones under electric and magnetic fields

Abstract

Here we present a theoretical study of the optical properties of graphene nanocones tuned by external electric and magnetic fields. We investigate the effects of the size and topology of the carbon nanostructures on the density of states and on the electro- and magneto-absorption of linearly polarized electromagnetic radiation in different nanocone geometries. We find that the electric field induces changes in the electric charge distribution mainly at the cone edges. In the infrared range the absorption coefficient shows a peculiar dependence on the electric field (magnitude and direction) and on the photon polarization for all investigated structures. Our results suggest that the electric field may be used to control the electric charge at the apex and for a selective light absorption. The presence of an axial magnetic field induces new features in the nanocone density of states due to the induced localization effects. For high fields the density of states exhibits a sequence of peaks resembling the graphene Landau spectra. The magneto-absorption spectra present a series of resonances strongly sensitive to the photon polarization opening routes for manipulation of the optical responses.

Umbrella Sampling Simulations of Carbon Nanoparticles Crossing Immiscible Solvents

“…The cones occur in five different apex angles, depending on the number of the pentagons on the framework. Carbon nanocones as well as nanohorns (i.e., nanotubes capped with sharp cones at one end) have been proposed for a number of applications such as gas storage and heterogeneous catalysis and have been suggested as probes in electronic and optical nanoscale devices [47][48][49][50][51][52].…”

Molecular Dynamics of Water Embedded Carbon Nanocones: Surface Waves Observation

“…The process under certain conditions produces a carbon material composed of microstructures, which are approximately 80% flat carbon disks, 5-15% cones with five different apex angles and 5-15% soot [62,63]. CNCs have promising properties as sensing and actuating elements in nanoscale devices [64,65]. Among these applications, their usage as atomic force microscopy (AFM) tips is of particular interest [66,67].…”