Department of Physics, National Cheng Kung University, Tainan, Taiwan 701.
ACS Nano. 2010 Mar 23;4(3):1465-72. doi: 10.1021/nn9015339.
The low-frequency magneto-optical properties of bilayer Bernal graphene are studied by the tight-binding model with the four most important interlayer interactions taken into account. Since the main features of the wave functions are well-depicted, the Landau levels can be divided into two groups based on the characteristics of the wave functions. These Landau levels lead to four categories of absorption peaks in the optical absorption spectra. Such absorption peaks own complex optical selection rules, and these rules can be reasonably explained by the characteristics of the wave functions. In addition, twin-peak structures, regular frequency-dependent absorption rates, and complex field-dependent frequencies are also obtained in this work. The main features of the absorption peaks are very different from those in monolayer graphene and have their origin in the interlayer interactions.
双层 Bernal 石墨烯的低频磁光性质通过考虑四个最重要的层间相互作用的紧束缚模型进行了研究。由于波函数的主要特征得到了很好的描述，因此可以根据波函数的特征将朗道能级分为两组。这些朗道能级在光学吸收光谱中导致了四类吸收峰。这些吸收峰具有复杂的光学选择定则，这些定则可以通过波函数的特征来合理地解释。此外，在这项工作中还得到了双峰结构、规则的频率相关吸收率和复杂的场依赖频率。吸收峰的主要特征与单层石墨烯非常不同，其起源于层间相互作用。
