Optical Response of twisted bilayer graphene

We study polarization-controlled, one-photon and two-photon optical responses of twisted bilayer graphene (tBLG) for a range of angles including the magic angle. Their spectrums evolve continuously with the change in polarizer-analyzer rotation combination, providing a fingerprint for the identification of the misorientation angle. At lower twist angles, we find a strong enhancement of the optical response of tBLG compared to a single-layer or Bernal-stacked bilayer. graphene