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Phys Rev Lett. 2007 May 11;98(19):197403. Epub 2007 May 11.

Infrared spectroscopy of Landau levels of graphene.

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  • 1Department of Physics, Columbia University, New York, NY 10027, USA. jiang@magnet.fsu.edu

Abstract

We report infrared studies of the Landau level (LL) transitions in single layer graphene. Our specimens are density tunable and show in situ half-integer quantum Hall plateaus. Infrared transmission is measured in magnetic fields up to B=18 T at selected LL fillings. Resonances between hole LLs and electron LLs, as well as resonances between hole and electron LLs, are resolved. Their transition energies are proportional to sqrt[B], and the deduced band velocity is (-)c approximately equal to 1.1 x 10(6) m/s. The lack of precise scaling between different LL transitions indicates considerable contributions of many-particle effects to the infrared transition energies.

PMID:
17677660
[PubMed]
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