Quantum-Hall activation gaps in graphene

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dc.creatorGiesbers, A. J. M.
dc.creatorZeitler, U.
dc.creatorKatsnelson, M. I.
dc.creatorPonomarenko, L. A.
dc.creatorMohiuddin, T. M. G.
dc.creatorMaan, J. C.
dc.date2007-06-19
dc.date2007-10-12
dc.date.accessioned2026-07-07T08:43:16Z
dc.date.available2026-07-07T08:43:16Z
dc.descriptionWe have measured the quantum-Hall activation gaps in graphene at filling factors $ν=2$ and $ν=6$ for magnetic fields up to 32 T and temperatures from 4 K to 300 K. The $ν=6$ gap can be described by thermal excitation to broadened Landau levels with a width of 400 K. In contrast, the gap measured at $ν=2$ is strongly temperature and field dependent and approaches the expected value for sharp Landau levels for fields $B > 20$ T and temperatures $T > 100$ K. We explain this surprising behavior by a narrowing of the lowest Landau level.
dc.description4 pages, 4 figures, updated version after review, accepted for PRL
dc.identifierhttps://arxiv.org/abs/0706.2822
dc.identifierhttp://arxiv.org/abs/0706.2822
dc.identifierPhys. Rev. Lett. 99, 206803 (2007)
dc.identifierdoi:10.1103/PhysRevLett.99.206803
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/142254
dc.subjectMesoscale and Nanoscale Physics
dc.titleQuantum-Hall activation gaps in graphene
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