Phys. Rev. Lett. 98, 197403 (2007) [4 pages]Infrared Spectroscopy of Landau Levels of GrapheneReceived 17 January 2007; published 11 May 2007 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 √B, and the deduced band velocity is c˜≈1.1×106 m/s. The lack of precise scaling between different LL transitions indicates considerable contributions of many-particle effects to the infrared transition energies. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.197403
DOI:
10.1103/PhysRevLett.98.197403
PACS:
78.66.Tr, 71.70.Di, 76.40.+b, 78.30.Na
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