Journal
NATURE PHYSICS
Volume 7, Issue 1, Pages 48-51Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1816
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Funding
- Swiss National Science Foundation (SNSF) [200021-120347, IZ73Z0-128026]
- National Centre of Competence in Research 'Materials with Novel Electronic Properties-MaNEP'
- German Research Council (DFG) at the University of Erlangen-Nuremberg [SE 1087/5-1]
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The rotation of the polarization of light after passing a medium in a magnetic field, discovered by Faraday(1), is an optical analogue of the Hall effect, which combines sensitivity to the carrier type with access to a broad energy range. Up to now the thinnest structures showing the Faraday rotation were several-nanometre-thick two-dimensional electron gases(2). As the rotation angle is proportional to the distance travelled by the light, an intriguing issue is the scale of this effect in two-dimensional atomic crystals or films-the ultimately thin objects in condensed matter physics. Here we demonstrate that a single atomic layer of carbon-graphene-turns the polarization by several degrees in modest magnetic fields. Such a strong rotation is due to the resonances originating from the cyclotron effect in the classical regime and the inter-Landau-level transitions in the quantum regime. Combined with the possibility of ambipolar doping(3), this opens pathways to use graphene in fast tunable ultrathin infrared magneto-optical devices.
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