论文标题
扭曲双层石墨烯的光导率附近
Optical Conductivity of Twisted Bilayer Graphene Near the Magic Angle
论文作者
论文摘要
从理论上讲，考虑晶格松弛的影响，我们从理论上研究了扭曲的双层石墨烯（TBG）的带结构和光导率。我们表明，光电导率光谱的特征是一系列与带状结构中的Van Hove奇异性相关的峰，并且峰能随着扭角系统而系统地演变。 TBG中的晶格弛豫效应改变了其带状结构，尤其是平坦带，这导致光导率中峰的显着变化。这些结果表明，光学传导率中的光谱特征可以用作探索魔术角TBG中带隙和晶格松弛的指纹，并识别其旋转角度。
We theoretically study the band structure and optical conductivity of twisted bilayer graphene (TBG) near the magic angle considering the effects of lattice relaxation. We show that the optical conductivity spectrum is characterized by a series of peaks associated with the van Hove singularities in the band structure, and the peak energies evolve systematically with the twist angle. Lattice relaxation effects in TBG modify its band structure, especially the flat bands, which lead to significant shifts of the peaks in optical conductivity. These results demonstrate that spectroscopic features in the optical conductivity can serve as fingerprints for exploring the band structure, band gap and lattice relaxation in magic angle TBG as well as identifying its rotation angle.
