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MM: Fachverband Metall- und Materialphysik

MM 47: Topical session: Data driven materials design - ab initio materials design

MM 47.3: Vortrag

Mittwoch, 22. März 2017, 16:30–16:45, BAR 205

Optical properties of disordered graphene quantum dots — •Abdulmenaf Altintas, Korhan Çakmak, and Alev Devrim Güçlü — Department of Physics, Izmir Institute of Technology, IZTECH, TR35430, Izmir, Turkey

We investigate the effects of disorder and electron-electron interactions on the optical properties of graphene quantum dots using tight-binding, mean-field Hubbard and configuration interaction approaches. We consider hexagonal armchair quantum dots containing up to 10806 atoms, where the disorder is modelled as a long-range random potential landscape, giving rise to electron-hole puddles. We show that disorder induced electron and hole localizations near Fermi level is reduced due to electron-electron interactions, making the observation of universal optical conductance robust against imperfections. When disorder is present, calculated absorption spectrum approaches the experimental results for isolated mono layer of graphene sheet.