硅烯量子点二聚物的等离激元激发

doi:10.3866/PKU.WHXB201603241

Abstract

Abstract:

The properties of plasmon excitations in silicene quantum dot dimers are investigated using timedependent density functional theory.Within a certain gap distance,a long-range charge transfer plasmon mode appears in silicene quantum dot dimers due to an impulse excitation polarized in the direction perpendicular to the quantum dot plane.The π electrons that participate in this plasmon excitation mostly move between the two quantum dots.This plasmon mode is blue-shifted as the gap distance decreases.Moreover,for different gap distances,two main plasmon bands appear,one around 7 eV and the other around 15 eV.In the low-energy region of the spectrum,for an impulse excitation polarized in the direction parallel to the silicene quantum dot plane,the shape of the absorption spectrum and the corresponding peak intensity of the silicene quantum dot dimers are both equivalent to those of a single silicene quantum dot,due to coupling between the two dots.

Key words: Plasmon, Silicene, Dimer, Time-dependent density functional theory

Hai-Feng YIN. Plasmon Excitations in Silicene Quantum Dot Dimers[J]. Acta Phys. -Chim. Sin. 2016, 32(6), 1446-1452. doi: 10.3866/PKU.WHXB201603241

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Plasmon Excitations in Silicene Quantum Dot Dimers

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