Tuning of energy levels and optical properties of graphene quantum dots
Tuning of energy levels and optical properties of graphene quantum dots
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DOI：
10.1103/physrevb.77.235411
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发表时间：
2008-05
影响因子：
3.7
通讯作者：
Z. Z. Zhang-Z.;Kai Chang;F. Peeters
中科院分区：
文献类型：
--
作者：
Z. Z. Zhang-Z.;Kai Chang;F. Peeters
利用紧束缚方法对锯齿形和扶手椅形六边形石墨烯量子点的磁性能级和光学性质进行了理论研究。在没有磁场的情况下，锯齿形GQD出现了零能量的束缚边缘态。GQD的磁能级呈现出Hofstadter-butterfly谱，并且随着磁场的增加接近二维石墨烯的朗道能级。光学性质由尺寸、边缘类型和外部磁场来调节。
We investigate theoretically the magnetic levels and optical properties of zigzag- and armchair-edged hexagonal graphene quantum dots (GQDs) utilizing the tight-binding method. A bound edge state at zero energy appears for the zigzag GQDs in the absence of a magnetic field. The magnetic levels of GQDs exhibit a Hofstadter-butterfly spectrum and approach the Landau levels of two-dimensional graphene as the magnetic field increases. The optical properties are tuned by the size, the type of the edge, and the external magnetic field.