1304.0866 (H. J. van Elferen et al.)

Fine structure of the lowest Landau level in suspended trilayer graphene    [PDF]

H. J. van Elferen, A. Veligura, N. Tombros, E. V. Kurganova, B. J. van Wees, J. C. Maan, U. Zeitler

Magneto-transport experiments on ABC-stacked suspended trilayer graphene reveal a complete splitting of the twelve-fold degenerated lowest Landau level, and, in particular, the opening of an exchange-driven gap at the charge neutrality point. A quantitative analysis of distinctness of the quantum Hall plateaus as a function of field yields a hierarchy of the filling factors: \nu=6, 4, and 0 are the most pronounced, followed by \nu=3, and finally \nu=1, 2 and 5. Apart from the appearance of a \nu=4 state, which is probably caused by a layer asymmetry, this sequence is in agreement with Hund's rules for ABC-stacked trilayer graphene.

View original: http://arxiv.org/abs/1304.0866