Spin and electronic correlations in gated graphene quantum rings

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.82.075425
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TypeArticle
Journal titlePhysical review. B, Condensed matter and materials physics
Volume82
Issue075425
Pages17; # of pages: 7
AbstractWe present a theory of graphene quantum rings designed to produce degenerate shells of single-particle states close to the Fermi level. We show that populating these shells with carriers using a gate leads to correlated ground states with finite total electronic spin. Using a combination of tight-binding and configuration-interaction methods, we predict the ground state and the total spin of the system as a function of the filling of the shell. We show that for smaller quantum rings, the spin polarization of the ground state at half filling depends strongly on the size of the system but reaches a maximum value beyond a critical size.
Publication date
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedYes
NPARC number17400956
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Record identifier3d8ca6c1-3153-4a91-a8d1-e84d873abb3f
Record created2011-03-26
Record modified2016-05-09
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