Magnetic edge states in Aharonov-Bohm graphene quantum rings

Journal Article · Sat Dec 07 00:00:00 EST 2013 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4842715· OSTI ID:22258695

Heidari Semiromi, E. ^[1]; Saffarzadeh, A. ^[2]

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1. Department of Physics, University of Kashan, Kashan (Iran, Islamic Republic of)
2. Department of Physics, Payame Noor University, P.O. Box 19395-3697 Tehran (Iran, Islamic Republic of)

The effect of electron-electron interaction on the electronic structure of Aharonov-Bohm (AB) graphene quantum rings (GQRs) is explored theoretically using the single-band tight-binding Hamiltonian and the mean-field Hubbard model. The electronic states and magnetic properties of hexagonal, triangular, and circular GQRs with different sizes and zigzag edge terminations are studied. The results show that, although the AB oscillations in the all types of nanoring are affected by the interaction, the spin splitting in the AB oscillations strongly depends on the geometry and the size of graphene nanorings. We found that the total spin of hexagonal and circular rings is zero and therefore, no spin splitting can be observed in the AB oscillations. However, the non-zero magnetization of the triangular rings breaks the degeneracy between spin-up and spin-down electrons, which produces spin-polarized AB oscillations.

• OSTI ID: 22258695
• Journal Information: Journal of Applied Physics, Vol. 114, Issue 21; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AHARONOV-BOHM EFFECT
ELECTRON-ELECTRON COLLISIONS
ELECTRON-ELECTRON COUPLING
ELECTRON-ELECTRON INTERACTIONS
ELECTRONIC STRUCTURE
GRAPHENE
HAMILTONIANS
HUBBARD MODEL
MAGNETIC PROPERTIES
MAGNETIZATION
MEAN-FIELD THEORY
OSCILLATIONS
SPIN
SPIN ORIENTATION