When the polarization direction of the laser beam Êlies on the graphene plane, the absorption spectrum Aω is isotropic and includes one sharp peak and some shoulders. As for Ê along the stacking direction, Aω is much weaker, and shows only one broadened peak. Because of the dipole matrix element Mcv, the optical excitations do not fully reflect the features of electronic structures [or the joint density of states (JDOS)]. Mcv plays an important role in the relationship between Aω and JDOS. It is strongly dependent on Ê showing an anisotropic property.
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