Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/6312
Title: Effects of long-range disorder and electronic interactions on the optical properties of graphene quantum dots
Authors: Altıntaş, Abdulmenaf
Çakmak, K. E.
Güçlü, Alev Devrim
Keywords: Graphene
Quantum dots
Electronic interactions
Issue Date: Jan-2017
Publisher: American Physical Society
Source: Altıntaş, A., Çakmak, K. E., and Güçlü, A. D. (2017). Effects of long-range disorder and electronic interactions on the optical properties of graphene quantum dots. Physical Review B, 95(4). doi:10.1103/PhysRevB.95.045431
Abstract: We theoretically investigate the effects of long-range disorder and electron-electron interactions on the optical properties of hexagonal armchair graphene quantum dots consisting of up to 10 806 atoms. The numerical calculations are performed using a combination of tight-binding, mean-field Hubbard, and configuration interaction methods. Imperfections in the graphene quantum dots are modeled as a long-range random potential landscape, giving rise to electron-hole puddles. We show that, when the electron-hole puddles are present, the tight-binding method gives a poor description of the low-energy absorption spectra compared to mean-field and configuration interaction calculation results. As the size of the graphene quantum dot is increased, the universal optical conductivity limit can be observed in the absorption spectrum. When disorder is present, the calculated absorption spectrum approaches the experimental results for isolated monolayers of graphene sheets.
URI: http://doi.org/10.1103/PhysRevB.95.045431
http://hdl.handle.net/11147/6312
ISSN: 2469-9950
2469-9969
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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