Indirect coupling between localized magnetic moments in zero-dimensional graphene nanostructures (quantum dots)
arXiv:1309.6457 · doi:10.12693/APhysPolA.126.236
Abstract
The indirect Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between on-site magnetic impurities is studied for two kinds of graphene nanoflakes consisting of approximately 100 carbon atoms, posessing either zigzag or armchair edge. The tight-binding Hamiltonian with Hubbard term is used in non-perturbative calculations of coupling between the impurities placed at the edge of the structure. In general, for zigzag-edged nanoflakes a pronounced coupling robust against charge doping is found, while for armchair-edged structures the interaction is weaker and much more sensitive to charge doping. Also the distance dependence of indirect exchange differs significantly for both edge forms.
2 pages, 2 figures, to appear in Proceedings of CSMAG'13 conference, modified to fit a strict 2 page length limit
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