Abstract
Time-dependent density functional theory has been used to investigate the plasmon excitation processes in silicene quantum dots. Two main plasmon resonance bands were observed running parallel to the direction to the silicene quantum dot plane around 2.0 and 7.0 e V. Given that delocalized π electrons can participate in the excitation of the two plasmon resonance bands, an increase in the side length of the rectangular silicene quantum dots in the direction of the excitation led to the red-shifting of the two main plasmon resonance bands. Plasmon excitation in silicene quantum dots is also dependent on the edge configuration.Furthermore, because of the relatively high symmetry of the hexagonal silicene quantum dot, the plasmon resonance modes of the quantum dots were found to be identical along the different excitation directions running parallel to the quantum dot plane.
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