Symmetry breaking of the zero energy Landau level in bilayer graphene

Abstract

The quantum Hall effect near the charge neutrality point in bilayer graphene is investigated in high magnetic fields of up to 35 T using electronic transport measurements. In the high field regime, the eight-fold degeneracy in the zero energy Landau level is completely lifted, exhibiting new quantum Hall states corresponding filling factors $\nu =$0, 1, 2, & 3. Measurements of the activation energy gap in tilted magnetic fields suggest that the Landau level splitting at the newly formed $\nu =$1, 2, & 3 filling factors are independent of spin, consistent with the formation of a quantum Hall ferromagnet. In addition, measurements taken at the $\nu$ = 0 charge neutral point show that, similar to single layer graphene, the bilayer becomes insulating at high fields.

4 pages 4 figures

References in corpus (14)

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• Broken symmetry states and divergent resistance in suspended bilayer graphene
• The zero-energy state in graphene in a high magnetic field
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• Boltzmann transport and residual conductivity in bilayer graphene
• Intra-Landau level Cyclotron Resonance in Bilayer Graphene
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• Spontaneous Symmetry Breaking and Quantum Hall Effect in Graphene
• Pseudo-zero-mode Landau levels and collective excitations in bilayer graphene
• Charge 2e skyrmions in bilayer graphene
• The enigma of the nu=0 quantum Hall effect in graphene

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