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

Abstract

We investigate the dependence of the optical conductivity of bilayer graphene (BLG) on the intra- and inter-layer 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 that are highly sensitive to sample doping, changing significantly the ``universal'' conductance. Further, its interplay with interlayer couplings leads to an anisotropy in 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 inter-layer couplings at different doping levels.

5 pages, 5 figures

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Cited by in corpus (4)

• $\mathcal{P}\mathcal{T}$ symmetry of the Su-Schrieffer-Heeger model with imaginary boundary potentials and next-nearest-neighboring coupling
• Vertical absorption edge and universal onset conductance in semi-hydrogenated graphene
• Comment on arXiv:0709.3700 "Orientation dependence of the optical spectra in graphene at high frequencies"
• Theory of interaction-induced renormalization of Drude weight and plasmon frequency in chiral multilayer graphene