Electronic Shells of Dirac Fermions in Graphene Quantum Rings in a Magnetic Field
P. Potasza, b, A.D. Güçlüa and P. Hawrylaka
a Institute for Microstructural Sciences, National Research Council of Canada, Ottawa, Canada
b Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
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We present results of tight binding calculations demonstrating existence of degenerate electronic shells of Dirac fermions in narrow, charge neutral graphene quantum rings. We predict removal of degeneracy with finite magnetic field. We show, using a combination of tight binding and configuration interaction methods, that by filling a graphene ring with additional electrons this carbon based structure with half filled shell acquires a finite magnetic moment.
DOI: 10.12693/APhysPolA.116.832
PACS numbers: 73.22.-f, 81.07.Ta