Optical absorption stacking modulation in atypical multilayer graphene

With graphene layers increasing, the interlayer charge transfers would generate an out-of-plane electric dipole moment, which is directly related to the optical absorption according to the Fermi Golden rule. Thus, in this work, we investigated the relationship between the absorption of multilayer graphene with different stacking orders from the transition dipole moment (TDM) and joint density of states (JDOS). It is found that the interlayer linkage of different stacking sequences leads to the varied chiral pseudospin doublets, which results in changes in TDM, consequently influencing the absorption spectra in the infrared and visible regions. While the enhanced absorption in the thicker multilayers from the ultraviolet to ionizing radiation region could be attributed to the increasement of JDOS. The comprehensive understanding of the absorption mechanism behind the multilayer graphene could provide another way of thinking about the optical absorption stacking modulation in atypical multilayer graphene.