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Giant Faraday rotation in single- and multilayer graphene

Walter, Andrew L.
Ostler, Markus
Bostwick, Aaron
Rotenberg, Eli
Seyller, Thomas
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Published in Nature physics. 2011, vol. 7, no. 1, p. 48-51
Abstract The rotation of the polarization of light after passing a medium in a magnetic field, discovered by Faraday, 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. 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 doping3, this opens pathways to use graphene in fast tunable ultrathin infrared magneto-optical devices.
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Research groups Groupe Kuzmenko
Groupe Van der Marel
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CRASSEE, Iris et al. Giant Faraday rotation in single- and multilayer graphene. In: Nature physics, 2011, vol. 7, n° 1, p. 48-51. doi: 10.1038/nphys1816 https://archive-ouverte.unige.ch/unige:23943

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Deposited on : 2012-11-12

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