Spin exchange interaction with tunable range between graphene quantum dots

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2011
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We study the spin exchange between two electrons localized in separate quantum dots in graphene. The electronic states in the conduction band are coupled indirectly by tunneling to a common continuum of delocalized states in the valence band. As a model, we use a two-impurity Anderson Hamiltonian which we subsequently transform into an effective spin Hamiltonian by way of a two-stage Schrieffer-Wolff transformation. We then compare our result to that from a Coqblin-Schrieffer approach as well as to fourth-order perturbation theory.

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ISO 690BRAUN, Matthias, Philipp STRUCK, Guido BURKARD, 2011. Spin exchange interaction with tunable range between graphene quantum dots. In: Physical Review B. 2011, 84(11). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.84.115445
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@article{Braun2011excha-19162,
  year={2011},
  doi={10.1103/PhysRevB.84.115445},
  title={Spin exchange interaction with tunable range between graphene quantum dots},
  number={11},
  volume={84},
  issn={1098-0121},
  journal={Physical Review B},
  author={Braun, Matthias and Struck, Philipp and Burkard, Guido}
}
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