Optical properties of graphene quantum dots: the role of chiral symmetry - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue 2D Materials Année : 2020

Optical properties of graphene quantum dots: the role of chiral symmetry

Ivan Duchemin
Xavier Blase

Résumé

We analyse the electronic and optical properties of graphene quantum dots (GQD) using accurate \textit{ab initio} many-body $GW$ and Bethe-Salpeter calculations. We show that most pristine GQD, including structures with irregular shapes, are characterized by dark low energy singlet excitations that quench fluorescence. We rationalize this property by exploiting the chiral symmetry of the low energy electronic states in graphene. Edge \textit{sp}$^3$ functionalization is shown to efficiently brighten these low lying excitations by distorting the \textit{sp}$^2$ backbone planar symmetry. Such findings reveal an original indirect scenario for the influence of functionalization on the photoluminescence properties.
Fichier principal
Vignette du fichier
1910.14362.pdf (3.7 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02518167 , version 1 (25-01-2024)

Identifiants

Citer

Denis M. Basko, Ivan Duchemin, Xavier Blase. Optical properties of graphene quantum dots: the role of chiral symmetry. 2D Materials, 2020, 7 (2), pp.025041. ⟨10.1088/2053-1583/ab7688⟩. ⟨hal-02518167⟩
94 Consultations
14 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More