物理化学学报 >> 2015, Vol. 31 >> Issue (1): 67-72.doi: 10.3866/PKU.WHXB201411211

理论与计算化学 上一篇    下一篇

硅烯量子点的等离激元激发

尹海峰1, 向功周1, 岳莉1, 张红2   

  1. 1. 凯里学院物理与电子工程学院, 贵州 凯里 556011;
    2. 四川大学物理科学与技术学院, 成都 610065
  • 收稿日期:2014-09-01 修回日期:2014-11-21 发布日期:2014-12-25
  • 通讯作者: 尹海峰, 张红 E-mail:yinhaifeng1212@126.com;hongzhang@scu.edu.cn
  • 基金资助:

    国家自然科学基金(11474207, 11464023), 凯里学院规划项目(Z1308, BS201301)和凯里学院原子与分子物理重点学科资助

Plasmon Excitation in Silicene Quantum Dots

YIN Hai-Feng1, XIANG Gong-Zhou1, YUE Li1, ZHANG Hong2   

  1. 1. College of Physics and Electronic Engineering, Kaili University, Kali 556011, Guizhou Province, P. R. China;
    2. College of Physical Science and Technology, Sichuan University, Chengdu 610065, P. R. China
  • Received:2014-09-01 Revised:2014-11-21 Published:2014-12-25
  • Contact: YIN Hai-Feng, ZHANG Hong E-mail:yinhaifeng1212@126.com;hongzhang@scu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (11474207, 11464023), Planning Project of Kaili University, China (Z1308, BS201301), and Atomic and Molecular Physics Key Disciplines of Kaili University, China.

摘要:

基于含时密度泛函理论, 研究了硅烯量子点的等离激元激发. 沿量子点所在的平面方向, 体系中有两个主要的等离激元共振带. 一个等离激元共振带位于2.0 eV附近, 另一个等离激元共振带位于7.0 eV附近. 由于离域化的π电子参与了两个等离激元共振带的激发, 沿激发方向随着矩形硅烯量子点边长的增加, 体系的两个等离激元共振带都发生红移. 硅烯量子点的等离激元激发还依赖于边界的构型. 此外, 由于六角形硅烯量子点的对称性较高,沿量子点所在平面的不同方向激发时, 体系的等离激元共振模式相同.

关键词: 等离激元, 硅烯, 量子点, 含时密度泛函理论

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.

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

MSC2000: 

  • O641