First-principles study of plasmons in doped graphene nanostructures*

被引:1
|
作者
Shu, Xiao-Qin [1 ]
Cheng, Xin-Lu [2 ]
Liu, Tong [3 ]
Zhang, Hong [2 ]
机构
[1] Leshan Normal Coll, Coll Math & Phys, Leshan 614000, Peoples R China
[2] Sichuan Univ, Coll Phys, Chengdu 610065, Peoples R China
[3] Xihua Univ, Sch Sci, Chengdu 610065, Peoples R China
基金
中国国家自然科学基金;
关键词
doped graphene; absorption spectroscopy; time-dependent density functional theory; ELECTRONIC-STRUCTURE; RECENT PROGRESS; H2S ADSORPTION; DRUG-DELIVERY; OXIDE; APPROXIMATION; CATALYST; CELLS; AL;
D O I
10.1088/1674-1056/abe92d
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The operating frequencies of surface plasmons in pristine graphene lie in the terahertz and infrared spectral range, which limits their utilization. Here, the high-frequency plasmons in doped graphene nanostructures are studied by the time-dependent density functional theory. The doping atoms include boron, nitrogen, aluminum, silicon, phosphorus, and sulfur atoms. The influences of the position and concentration of nitrogen dopants on the collective stimulation are investigated, and the effects of different types of doping atoms on the plasmonic stimulation are discussed. For different positions of nitrogen dopants, it is found that a higher degree of symmetry destruction is correlated with weaker optical absorption. In contrast, a higher concentration of nitrogen dopants is not correlated with a stronger absorption. Regarding different doping atoms, atoms similar to carbon atom in size, such as boron atom and nitrogen atom, result in less spectral attenuation. In systems with other doping atoms, the absorption is significantly weakened compared with the absorption of the pristine graphene nanostructure. Plasmon energy resonance dots of doped graphene lie in the visible and ultraviolet spectral range. The doped graphene nanostructure presents a promising material for nanoscaled plasmonic devices with effective absorption in the visible and ultraviolet range.
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页数:7
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