Graphene with adatoms: Tuning the magnetic moment with an applied voltage

We show that, in graphene with a small concentration of adatoms, the total magnetic moment μT can be switched on and off by varying the Fermi energy EF, either by applying a gate voltage or by suitable chemical doping. Our calculation is carried out using a simple tight-binding model described previ...

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Bibliographic Details
Published in:Applied physics letters 2014-08, Vol.105 (5)
Main Authors: Pike, N. A., Stroud, D.
Format: Article
Language:English
Subjects:
Adatoms
Applied physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electric potential
ELECTRON-ELECTRON INTERACTIONS
Electrons
FERMI LEVEL
GRAPHENE
MAGNETIC MOMENTS
Organic chemistry
Physical, chemical, mathematical & earth Sciences
Physics
Physique
Physique, chimie, mathématiques & sciences de la terre
TUNING
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Summary:We show that, in graphene with a small concentration of adatoms, the total magnetic moment μT can be switched on and off by varying the Fermi energy EF, either by applying a gate voltage or by suitable chemical doping. Our calculation is carried out using a simple tight-binding model described previously, combined with a mean-field treatment of the electron-electron interaction on the adatom. The values of EF at which the moment is turned on or off are controlled by the strength of the hopping between the graphene sheet and the adatom, the on-site energy of the adatom, and the strength of the electron-electron correlation energy U. Our result is qualitatively consistent with recent experiments [R. R. Nair et al., Nat. Commun. 4, 2010 (2013)].
ISSN:0003-6951
1077-3118
1077-3118
DOI:10.1063/1.4892573