Plasmons in metallic monolayer and bilayer transition metal dichalcogenides

  title={Plasmons in metallic monolayer and bilayer transition metal dichalcogenides},
  author={Kirsten Andersen and Kristian Sommer Thygesen},
  journal={Physical Review B},
We study the collective electronic excitations in metallic single- and bilayer transition metal dichalcogenides (TMDCs) using time dependent density functional theory in the random phase approximation. For very small momentum transfers (below $q\approx0.02$~\AA$^{-1}$) the plasmon dispersion follows the $\sqrt{q}$ behavior expected for free electrons in two dimensions. For larger momentum transfer the plasmon energy is significantly red shifted due to screening by interband transitions. At… 

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