Van Hove Singularities and Excitonic Effects in the Optical Conductivity of Twisted Bilayer Graphene
Van Hove Singularities and Excitonic Effects in the Optical Conductivity of Twisted Bilayer Graphene
We report a systematic study of the optical conductivity of twisted bilayer graphene (tBLG) across a large energy range (1.2–5.6 eV) for various twist angles, combined with first-principles calculations. At previously unexplored high energies, our data show signatures of multiple van Hove singularities (vHSs) in the tBLG bands as well …