Plasmons in metallic monolayer and bilayer transition metal dichalcogenides

@article{Andersen2013PlasmonsIM,
title={Plasmons in metallic monolayer and bilayer transition metal dichalcogenides},
author={Kirsten Andersen and Kristian Sommer Thygesen},
journal={Physical Review B},
year={2013},
volume={88},
pages={155128}
}
• Published 23 October 2013
• Physics
• 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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