Abstract
The conductivity in a bilayer graphene in zero magnetic field is calculated within the self‐consistent Born approximation. The bilayer graphene has a semi‐metallic spectrum where the conduction and valence bands with k‐square dispersions touch at the zero energy. We find that the quantum effect is significant around zero energy, where the conductivity becomes nearly universal, 2e2/π2h per spin, in a large disorder.
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