Quantum-Hall activation gaps in graphene

Details Quantum-Hall activation gaps in graphene Quantum-Hall activation gaps in graphene

2007-06-19

arxiv.org/abs/0706.2822v2

Phys. Rev. Lett. 99, 206803 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, updated version after review, accepted for PRL

Scientific paper

10.1103/PhysRevLett.99.206803

We have measured the quantum-Hall activation gaps in graphene at filling factors $\nu=2$ and $\nu=6$ for magnetic fields up to 32 T and temperatures from 4 K to 300 K. The $\nu =6$ gap can be described by thermal excitation to broadened Landau levels with a width of 400 K. In contrast, the gap measured at $\nu=2$ 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.

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