2010/07/20 by A. D. Güçlü, A. D. Guclu, Paweł Potasz +3 · 146 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Band gap #Condensed matter physics #Electron #Graphene #Graphene quantum dot #Graphene research and applications #Materials science #Nanotechnology #Optoelectronics #Physics #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Terahertz radiation #Zigzag #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.82.155445
published in Physical Review B 82(15) (American Physical Society) · ~4 pages, 4 figures
arxiv created 2010/07/20 · openalex publication_date 2010/10/26 · arxiv updated 2015/05/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a theory of excitonic processes in gate controlled graphene quantum dots. The dependence of the energy gap on shape, size, and edge for graphene quantum dots with up to a million atoms is predicted. Using a combination of tight-binding, Hartree-Fock and configuration interaction methods, we show that triangular graphene quantum dots with zigzag edges exhibit optical transitions simultaneously in the terahertz, visible and UV spectral ranges, determined by strong electron-electron and excitonic interactions. The relationship between optical properties and finite magnetic moment and charge density controlled by an external gate is predicted.