Electronic and magnetic properties of triangular graphene quantum rings

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.83.174441
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TypeArticle
Journal titlePhysical Review B : Condensed Matter and Materials Physics
Volume83
Issue17
Article number174441
Pages174441-1174441-6
AbstractElectronic and magnetic properties of triangular graphene rings potentially fabricated using carbon nanotubes as masks are described as a function of their size and width. The electronic properties of the charge neutral system are calculated using tight-binding method and interactions are treated using the mean-field Hubbard model. We show that for triangular quantum dots with a triangular hole, the magnetic properties are determined by the width of the ring, leading to ferromagnetic corners and antiferrimagnetic sides. The electronic properties of gated graphene quantum rings as a function of additional number of electrons or holes are described by a combination of tight-binding, Hartree-Fock, and configuration interaction methods. The outer edge is found to be maximally spin polarized for almost all filling factors while the evolution of the excitation gap as a function of shell filling shows oscillations as a result of electronic correlations.
Publication date
PublisherAmerican Physical Society
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedYes
NPARC number19371552
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Record identifierdaf967cc-4648-4d76-b354-ee1e031fff03
Record created2012-02-29
Record modified2016-05-09
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