Role Played by Edge-Defects in the Optical Properties of Armchair Graphene Nanoribbons

Abstract

We explore the implementation of specific optical properties of armchair graphene nanoribbons (AGNRs) through edge-defect manipulation. This technique employs the tight-binding model in conjunction with the calculated absorption spectral function. Modification of the edge states gives rise to the diverse electronic structures with striking changes in the band gap and special flat bands at low energy. The optical-absorption spectra exhibit unique excitation peaks, and they strongly depend on the type and period of the edge extension. Remarkably, there exist the unusual transition channels associated with the flat bands for selected edge-modified systems. We discovered the special rule governing how the edge-defect influences the electronic and optical properties in AGNRs. Our theoretical prediction demonstrates an efficient way to manipulate the optical properties of AGNRs. This might be of importance in the search for suitable materials designed to have possible technology applications in nano-optical, plasmonic and optoelectronic devices.

Optical Absorption of TaS₂ and TaSe₂ Transition-Metal Dichalcogenides

“…When a 2D material is subjected to an electromagnetic field carrying the electric polarization 𝐄𝐄 � with frequency 𝜔𝜔, vertical optical transitions from occupied to unoccupied states can be triggered. The absorption coefficient is computed by using the absorption function [13].…”

Electronic, transport, magnetic, and optical properties of graphene nanoribbons and their optical sensing applications: A comprehensive review

“…[281] Recently, Do et al explored the unusual optical properties of defective AGNRs. [282] Hieu et al reported the optical behavior of AGNRs using the multi-orbital TB approach. [283] The optical properties of graphene nanoribbons and their tunability with size, edge structure, external field, and edge functionalization motivate researchers to fabricate graphene nanoribbon-based optoelectronic devices.…”

Semi-Empirical Pseudopotential Method for Graphene and Graphene Nanoribbons

“…AGNRs also exhibit attractive optical properties, with efficient light absorption and emission capabilities, making them suitable for optoelectronic applications such as photodetectors [ 27 ] and light-emitting diodes [ 28 ]. Furthermore, AGNRs have shown potential in topological physics [ 29 , 30 , 31 , 32 ], with the ability to host topological edge states and phenomena such as the quantum spin Hall effect. This opens up possibilities for the development of topological quantum devices and spintronics.…”