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We explore the collective electronic excitations of bilayer molybdenum disulfide (MoS2) using the density functional theory together with the random phase approximation. The many-body dielectric function and electron-energy loss spectra are calculated using an ab initio based model involving material-realistic Coulomb interactions. The electron-energy loss function of bilayer MoS2 system is
found to be sensitive to either electron or hole doping and it is owing to the fact that the Kohn-Sham band dispersions are not symmetric for energies above and below the zero Fermi level. For small momentum transfer, the plasmon dispersion exhibits p q dispersion as the conventional plasmon of a two-dimensional electron gas originating from low-energy electron scattering.
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