The linear and hyperbolic electronic bands of single- and bilayer graphene give rise to quantum Hall effects that are different from those seen in previously studied 2D systems. The electronic structure of trilayer graphene includes both types of band, giving rise to even richer behaviour.
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Freitag, M. Trilayers unravelled. Nature Phys 7, 596–597 (2011). https://doi.org/10.1038/nphys2032
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DOI: https://doi.org/10.1038/nphys2032
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