Long-range exchange interaction between magnetic impurities in graphene
arXiv:1610.09000 · doi:10.1103/PhysRevB.95.075411
Abstract
The effective spin exchange coupling between impurities (adatoms) on graphene mediated by conduction electrons is studied as a function of the strength of the potential part of the on-site energy of the electron-adatom interaction. With increasing , the exchange coupling becomes long-range, determined largely by the impurity levels with energies close to the Dirac points. When adatoms reside on opposite sublattices, their exchange coupling, normally antiferromagnetic, becomes ferromagnetic and resonantly enhanced at a specific distance where an impurity level crosses the Dirac point.
7 pages, 3 figures
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