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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 14677
School of Nano Science
  Title:   Plasmon modes of bilayer molybdenum disulfide: A density functional study
  Author(s): 
1 . Zahra Torbatian
2 . Reza Asgari
  Status:   Published
  Journal: J. Physics: Condens. Matter
  No.:  46
  Vol.:  29
  Year:  2017
  Pages:   465701
  Publisher(s):   IOP Publishing Ltd
  Supported by:  IPM
  Abstract:
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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