Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (6): 1446-1452.doi: 10.3866/PKU.WHXB201603241

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Plasmon Excitations in Silicene Quantum Dot Dimers

Hai-Feng YIN1,2,*()   

  1. 1 College of Physics and Electronic Engineering, Kaili University, Kaili 556011, Guizhou Province, P. R. China
    2 College of Physical Science and Technology, Wuhan University, Wuhan 430072, P. R. China
  • Received:2015-11-26 Published:2016-06-03
  • Contact: Hai-Feng YIN
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(11464023);Innovative Talent Team of Colleges of GuizhouProvince, China ([2012]06)(黔教合人才团队字[2012]06号);Atomic and Molecular Physics Key Disciplines of Kaili University, China.


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


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