Title :
Quantum plasmonics in graphene nano-flakes: A time-dependent density functional theory study
Author :
Wei Wu ; Panoiu, Nicolae Coriolan
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, London, UK
Abstract :
The optical spectra for a variety of single and coupled graphene nano-flakes have been studied using time-dependent density functional theory within generalized gradient approximation. The time evolution of the charge density induced by a continuous-wave electrical field excitation has been calculated as well, in order to investigate the plasmonic properties of these graphene nano-structures. For the small graphene nano-flakes (diameter ~1nm), the edge plasmons are dominant, whereas for larger ones (diameter ~2nm) the edge plasmons are accompanied by multipolar collective charge oscillations, a typical characteristics for surface plasmons. This study might be used to guide the experimental observation of quantum plasmons in graphene nano-structures.
Keywords :
density functional theory; gradient methods; graphene; nanostructured materials; plasmonics; surface plasmons; ultraviolet spectra; visible spectra; C; charge density; continuous-wave electrical field excitation; coupled graphene nanoflakes; edge plasmons; generalized gradient approximation; graphene nanostructures; multipolar collective charge oscillations; optical spectra; quantum plasmonics; quantum plasmons; single graphene nanoflakes; surface plasmons; time evolution; time-dependent density functional theory; Absorption; Density functional theory; Graphene; Metamaterials; Optics; Plasmons;
Conference_Titel :
Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS), 2014 8th International Congress on
Conference_Location :
Lyngby
Print_ISBN :
978-1-4799-3450-8
DOI :
10.1109/MetaMaterials.2014.6948679
