Flavor Symmetry and Competing Orders in Bilayer Graphene

Details Flavor Symmetry and Competing Orders in Bilayer Graphene Flavor Symmetry and Competing Orders in Bilayer Graphene

2010-02-09

arxiv.org/abs/1002.1966v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4.1 pgs

Scientific paper

We analyze competition between different ordered states in bilayer graphene (BLG). Combining arguments based on SU(4) spin-valley flavor symmetry with a mean field analysis, we identify the lowest energy state with the anomalous Hall insulator (AHI). This state is an SU(4) singlet excitonic insulator with broken time reversal symmetry, exhibiting quantized Hall effect in the absence of external magnetic field. Applied electric field drives an Ising-type phase transition, restoring time reversal symmetry. Applied magnetic field drives a transition from the AHI state to a quantum Hall ferromagnet state. We estimate energies of these states, taking full account of screening, and predict the phase diagram.

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