Electric field control of spins in bilayer graphene: Local moment formation and local moment interactions
arXiv:1101.1303 · doi:10.1088/1367-2630/13/5/053043
Abstract
We study local moment formation for adatoms on bilayer graphene (BLG) within a mean-field theory of the Anderson impurity model. The wavefunctions of the BLG electrons induce strong particle-hole asymmetry and band dependence of the hybridization, which is shown to result in unusual features in the impurity model phase diagram. We also study the effect of varying the chemical potential, as well as varying an electric field perpendicular to the bilayer; the latter modifies the density of states of electrons in BLG and, more significantly, shifts the impurity energy. We show that this leads to regimes in the impurity phase diagram where local moments can be turned on or off by applying modest external electric fields. Finally, we show that the RKKY interaction between local moments can be varied by tuning the chemical potential (as has also been suggested in monolayer graphene) or, more interestingly, by tuning the electric field so that it induces changes in the band structure of BLG.
arXiv commentRevised discussion and figures, 17 pages
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Cited by in corpus (4)
- Ferrimagnetic and antiferromagnetic phase in bilayer graphene nanoflake controlled with external electric fields
- RKKY interaction in bilayer graphene
- Stable local moments of vacancies and hollow-site impurities in graphene
- Fano-shaped impurity spectral density, electric-field-induced in-gap state and local magnetic moment of an adatom on trilayer graphene