2007/03/31 by Z. Jiang, E. A. Henriksen, L. C. Tung +5 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.98.197403
published as Phys. Rev. Lett. 98, 197403 (2007). · 4 pages, 3 figures, to appear in Phys. Rev. Lett
arxiv created 2007/04/06 · arxiv updated 2009/12/01
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.