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Paper IPM / NanoSciences / 14677  


Abstract:  
We explore the collective electronic excitations of bilayer molybdenum disulfide (MoS2) using the density functional theory together with the random phase approximation. The manybody dielectric function and electronenergy loss spectra are calculated using an ab initio based model involving materialrealistic Coulomb interactions. The electronenergy 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 KohnSham 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 twodimensional electron gas originating from lowenergy electron scattering.
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