Plasmon excitation in silicene quantum dots

Abstract

Time-dependent density functional theory has been used to investigate the plasmon excitation processes in silicene quantumdots. Two main plasmon resonance bands were observed running parallel to the direction to the silicene quantumdot plane around 2.0 and 7.0 eV. 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 quantumdots in the direction of the excitation led to the red-shifting of the two main plasmon resonance bands. Plasmon excitation in silicene quantumdots 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 quantumdots were found to be identical along the different excitation directions running parallel to the quantumdot plane.