Excitonic absorption in gate-controlled graphene quantum dots

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.82.155445
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TypeArticle
Journal titlePhysical Review B, Condensed matter and materials physics
Volume82
Issue15
Pages15; # of pages: 5
AbstractWe 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.
Publication date
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedYes
NPARC number17400966
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Record identifier1e73ba9a-1b39-4663-8566-ae0653a3e158
Record created2011-03-26
Record modified2016-05-09
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