Biexciton binding of Dirac fermions confined in colloidal graphene quantum dots

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DOIResolve DOI: http://doi.org/10.1021/acs.nanolett.5b01888
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TypeArticle
Journal titleNano Letters
ISSN1530-6984
Volume15
Issue8
Pages54725476; # of pages: 5
SubjectBinding energy; Excitons; Graphene; Molecular physics; Nanocrystals; Quantum chemistry; Biexcitons; Configuration interactions; Dirac fermions; Hartree-fock; Transient absorption; Semiconductor quantum dots
AbstractWe present transient absorption measurements and microscopic theory of biexciton binding in triangular colloidal graphene quantum dots consisting of 168 sp2-hybridized C atoms. We observe optical transitions from the lowest orbitally dark singlet exciton states to states below the energy of an unbound dark+bright singlet-exciton pair. Through microscopic calculations of the low-energy exciton and biexciton states via tight-binding, Hartree-Fock, and configuration interaction methods, the spectra reveal a biexciton consisting primarily of a dark-bright singlet-pair bound by ∼0.14 eV.
Publication date
PublisherAmerican Chemical Society
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21277030
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Record identifierf5ca3912-c4db-47dd-82e9-9de3b0d2ee11
Record created2015-11-10
Record modified2016-05-09
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