“School of Physics”
Back to Papers HomeBack to Papers of School of Physics
| Paper IPM / P / 12577 |
|
||||||||
| Abstract: | |||||||||
|
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.
Download TeX format |
|||||||||
| back to top | |||||||||
