Magnetism and Correlations in Fractionally Filled Degenerate Shells of Graphene Quantum Dots

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.103.246805
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TypeArticle
Journal titlePhysical Review Letters
Volume103
Issue24
Pages246805-1246805-4; # of pages: 4
AbstractWe show that the ground state and magnetization of the macroscopically degenerate shell of electronic states in triangular gated graphene quantum dots depends on the filling fraction of the shell. The effect of degeneracy, finite size, and electron-electron interactions are treated nonperturbatively using a combination of density functional theory, tight-binding, Hartree-Fock and configuration interaction methods. We show that electronic correlations play a crucial role in determining the nature of the ground state as a function of filling fraction of the degenerate shell at the Fermi level. We find that the half-filled charge neutral shell leads to full spin polarization but this magnetic moment can be completely destroyed by adding a single electron.
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LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedNo
NPARC number17400964
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Record identifier63c5d495-d0a4-45ad-b9d1-bc39d4a4674d
Record created2011-03-29
Record modified2016-05-09
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