Plasmon excitation in MoS2/graphene van der waals heterostructures

We have carried out a study of collective excitations for MoS2/graphene van der Waals heterostructures (vdWHs) using time-dependent density function theory (TDDFT). The resonance absorption spectra of the structures were analysed to determine the polarisation direction in the X-, Y- and Z-axes. We found that the resonance intensities in MoS2/graphene structures were larger than the bilayer graphene structures in high-energy resonance, and the resonance peak of the graphene/MoS2/graphene heterostructure almost annihilated at the low-energy resonance band became broadened at the high-energy resonance band. We studied Fourier-induced charge density of MoS2/graphene structures and found that they have dipole-like characteristics in the low-energy region.