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Indirect coupling between localized magnetic moments in zero-dimensional graphene nanostructures (quantum dots)

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.

preprint2013arXivOpen access
Karol Szałowski
cond-mat.mes-hallcond-mat.str-elcond-mat.mtrl-sci
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Karol Szałowski

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