Optical Properties of Chiral Graphene Nanoribbons: a First Principal Study

TL;DR

This study investigates the optical properties of chiral graphene nanoribbons using density functional theory, revealing how symmetry breaking affects absorption spectra and highlighting their potential for optoelectronic applications.

Contribution

It provides the first detailed analysis of optical behavior in chiral graphene nanoribbons, showing the impact of symmetry breaking on absorption characteristics.

Findings

Optical absorption peaks depend on polarization and chiral vector.

Symmetry breaking alters absorption peaks, shifting them around 1000nm.

Edge states significantly influence optical absorption in chiral GNRs.

Abstract

In this paper, optical properties of Chiral Graphene Nanoribbons both in longitude and transverse polarization have been studied using density functional theory calculation. It has been shown that the selection rule which have been reported before for Armchair and Zigzag Graphene Nanoribbons are no longer valid due to breaking symmetry on these new categorize of graphene nanoribbons. However, still the edge states play a critical role in optical absorption. It have been illustrated that depending on the polarization of incident beam the absorption peaks are different while it is spread in the same energy range. It is also suggested that the absorption of light is sensitive to the chiral vector on the edges and direction of the light polarization. Due to breaking symmetry in chiral graphene nanoribbons, absorption peak is changed and it would be around 1000nm, introducing a new potential of graphene nanoribbons for optoelectronic devices.