Quantum-hall activation gaps in graphene

A. J M Giesbers*, U. Zeitler, M. I. Katsnelson, L. A. Ponomarenko, T. M. Mohiuddin, J. C. Maan

*Corresponding author for this work

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Abstract

We 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 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>20T and temperatures T>100K. We explain this surprising behavior by a narrowing of the lowest Landau level.

Original languageEnglish
Article number206803
JournalPhysical Review Letters
Volume99
Issue number20
DOIs
Publication statusPublished - Nov 14 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Giesbers, A. J. M., Zeitler, U., Katsnelson, M. I., Ponomarenko, L. A., Mohiuddin, T. M., & Maan, J. C. (2007). Quantum-hall activation gaps in graphene. Physical Review Letters, 99(20), [206803]. https://doi.org/10.1103/PhysRevLett.99.206803