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We investigate the dependence of the optical conductivity of bilayer graphene(BLG) on the intra- and inter-layer interactions using the most complete modelto date. We show that the next nearest-neighbor intralayer coupling introducesnew features in the low-energy spectrum that are highly sensitive to sampledoping, changing significantly the ``universal'' conductance. Further, itsinterplay with interlayer couplings leads to an anisotropy in conductance inthe ultraviolet range. We propose that experimental measurement of the opticalconductivity of intrinsic and doped BLG will provide a good benchmark for therelative importance of intra- and inter-layer couplings at different dopinglevels.

Effect of next-nearest neighbor coupling on the optical spectra in bilayer graphene