Optical properties for armchair-edge graphene nanoribbons
Optical properties for armchair-edge graphene nanoribbons
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DOI：
10.1063/1.3033487
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发表时间：
2008-12
影响因子：
3.2
通讯作者：
W. Liao;Guanghui Zhou;Fu Xi
中科院分区：
文献类型：
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作者：
W. Liao;Guanghui Zhou;Fu Xi
我们从理论上研究了半导体型和金属型扶手椅边缘石墨烯纳米带在低温外部纵向极化电磁场照射下的光学性质。在微扰状态下的线性响应理论框架内，我们研究了系统的实际电导、介电函数和电子能量损失谱。通过数值例子证明，存在一些从可见光到紫外光的光子辅助子带间跃迁，其选择规则与锯齿形边缘石墨烯纳米带和单壁碳纳米管的选择规则不同。我们的研究结果对于探索石墨烯降维的新效应及其光电应用具有特别重要的意义。
We theoretically investigate the optical properties of semiconductor- and metal-type armchair-edge graphene nanoribbon irradiated under an external longitudinal polarized electromagnetic field at low temperatures, respectively. Within the framework of linear response theory in the perturbation regime, we examine the real conductance, dielectric function, and electron energy loss spectra of the systems. It is demonstrated that by numerical examples, some photon-assisted intersubband transitions from visible to ultraviolet light exist with different selection rules from those of both zigzag-edge graphene nanoribbon and single-walled carbon nanotube. Our results are of particular significance for exploring new effects of dimensional reduction in graphene and its optoelectronic applications.