Abstract
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We investigate the dependence of the optical conductivity of bilayer graphene (BLG) on the
intra and interlayer interactions using the most complete model to date. We show that the next
nearest neighbor intralayer coupling introduces new features in the low energy spectrum
significantly changing the universal conductance. Further, its interplay with interlayer
couplings leads to an anisotropy in the conductance in the ultraviolet range. We propose that
experimental measurement of the optical conductivity of intrinsic and doped BLG will provide
a good benchmark for the relative importance of intra and interlayer couplings at different
doping levels.