Spin Symmetry of the Bilayer Graphene Groundstate
arXiv:1212.5918 · doi:10.1103/PhysRevB.87.161402
Abstract
We show nonlinear transport experiments on clean, suspended bilayer graphene that reveal a gap in the density of states. Looking at the evolution of the gap in magnetic fields of different orientation, we find that the groundstate is a spin-ordered phase. Of the three possible gapped groundstates that are predicted by theory for equal charge distribution between the layers, we can therefore exclude the quantum anomalous Hall phase, leaving the layer antiferromagnet and the quantum spin Hall phase as the only possible gapped groundstates for bilayer graphene.
10 pages, 4 figures, published version
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- Interplay between topological protected valley and quantum Hall edge transport
- Triplet superconductivity and spin density wave in biased AB bilayer graphene
- Half-metal and other fractional metal phases in doped AB bilayer graphene
- Color degeneracy of competing orders near topological defects cores in planar quadratic band touching systems
- Electrically controllable magnetic order in the bilayer Hubbard model on honeycomb lattice --- a determinant quantum Monte Carlo study
- Broken symmetry states in bilayer graphene in electric and in-plane magnetic fields
- Ordered states of undoped AB bilayer graphene: bias induced cascade of transitions