Fig. 6
From: Strain-enhanced two-photon absorption in twisted bilayer graphene
Two-photon absorption spectra associated with the nearest six energy bands near zero energy in twist bilayer graphene with twist angle θ = 1.05° and different strain magnitude at strain direction \(\phi\) = 15°. (a) Both the interband and intraband transitions are involved; (b) Interband transition two-photon absorption spectra; (c) Intra-conduction band transition two-photon absorption spectra; (d) Intra-valence band transition two-photon absorption spectra.
