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Paper   IPM / Physic / 14685
School of Physics
  Title:   Plasmon modes of bilayer molybdenum disulfide: A density functional study
1.  Z. Torbatian
2.  R. Asgari
  Status:   Published
  Journal: J. Physics: Condens. Matter
  Vol.:  29
  Year:  2017
  Pages:   465701
  Supported by:  IPM
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 physical properties. 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 √q dispersion as the conventional plasmon of a two-dimensional electron gas originating from low-energy electron scattering.

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