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Paper   IPM / P / 12577
School of Physics
  Title:   Anisotropic RKKY Interaction in Spin-Polarized Graphene
1.  F. Parhizgar
2.  R. Asgari
3.  S. Abedinpour
4.  M. Zareyan
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  87
  Year:  2013
  Pages:   125402
  Supported by:  IPM
We study the Ruderman-Kittle-Kasuya-Yosida (RKKY) interaction in the presence of spin polar- ized two dimensional Dirac fermions. We show that a spin polarization along the z-axis mediates an anisotropic interaction which corresponds to a XXZ model interaction between two magnetic moments. For undoped graphene, while the x parts of the interaction keeps its constant ferromag- netic sign, its z part oscillates with the distance of magnetic impurities, R. A nite doping causes that both parts of the interaction oscillate with R. We explore a beating pattern of oscillations of the RKKY interaction along armchair and zigzag lattice directions, which occurs for some certain values of the chemical potential. The two characteristic periods of the beating are determined by inverse of the di erence and the sum of the chemical potential and spin polarization.

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