Spin exchange interaction with tunable range between graphene quantum dots

Braun, Matthias; Struck, Philipp; Burkard, Guido

Spin exchange interaction with tunable range between graphene quantum dots

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Date

2011

Authors

Braun, Matthias

Struck, Philipp

Burkard, Guido

Publication type

Journal article

Published in

Physical Review B ; 84 (2011), 11. - ISSN 1098-0121

Abstract

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.

Subject (DDC)

530 Physics

Cite This

ISO 690

BRAUN, Matthias, Philipp STRUCK, Guido BURKARD, 2011. Spin exchange interaction with tunable range between graphene quantum dots. In: Physical Review B. 84(11). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.84.115445

BibTex

@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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Bibliography of Konstanz

Yes