Observation of the fractional quantum Hall effect in graphene

Kirill I. Bolotin, Fereshte Ghahari, Michael D. Shulman, Horst L. Stormer and Philip Kim ()
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Kirill I. Bolotin: Department of Physics,
Fereshte Ghahari: Department of Physics,
Michael D. Shulman: Columbia University, New York, New York 10027, USA
Horst L. Stormer: Department of Physics,
Philip Kim: Department of Physics,

Nature, 2009, vol. 462, issue 7270, 196-199

Abstract: Graphene takes partial charge The fractional quantum Hall effect is a quintessential manifestation of the collective behaviour associated with strongly interacting charge carriers confined to two dimensions and subject to a strong magnetic field. It is predicted that the charge carriers present in graphene — an atomic layer of carbon that can be seen as the 'perfect' two-dimensional system — are subject to strong interactions. Nevertheless, the phenomenon had eluded experimental observation until now: in this issue two groups report fractional quantum Hall effect in suspended sheets of graphene, probed in a two-terminal measurement setup. The researchers also observe a magnetic-field-induced insulating state at low carrier density, which competes with the quantum Hall effect and limits its observation to the highest-quality samples only. These results pave the way for the study of the rich collective behaviour of Dirac fermions in graphene.

Date: 2009
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DOI: 10.1038/nature08582

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