Field induced quantum-Hall ferromagnetism in suspended bilayer graphene

Details Field induced quantum-Hall ferromagnetism in suspended bilayer graphene Field induced quantum-Hall ferromagnetism in suspended bilayer graphene

2011-12-22

arxiv.org/abs/1112.5368v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.85.115408

We have measured the magneto-resistance of freely suspended high-mobility bilayer graphene. For magnetic fields $B>1$ T we observe the opening of a field induced gap at the charge neutrality point characterized by a diverging resistance. For higher fields the eight-fold degenerated lowest Landau level lifts completely. Both the sequence of this symmetry breaking and the strong transition of the gap-size point to a ferromagnetic nature of the insulating phase developing at the charge neutrality point.

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