Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-08-25
Phys. Rev. B 83, 085410 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
21 pages, 4 figures, including supplementary information
Scientific paper
10.1103/PhysRevB.83.085410
Adatoms offer an effective route to modify and engineer the properties of graphene. In this work, we create dilute fluorinated graphene using a clean, controlled and reversible approach. At low carrier densities, the system is strongly localized and exhibits an unexpected, colossal negative magnetoresistance. The zero-field resistance is reduced by a factor of 40 at the highest field of 9 T and shows no sign of saturation. Unusual "staircase" field dependence is observed below 5 K. The magnetoresistance is highly anisotropic. We discuss possible origins, considering quantum interference effects and adatom-induced magnetism in graphene.
Cheng S.-H.
Herding C.
Hong Xia
Zhu Jia-Ji
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