论文标题
阻力电流的手性相关性诱导扭曲双层石墨烯的光学活性
Chiral correlation of drag currents inducing optical activity of twisted bilayer graphene
论文作者
论文摘要
研究了扭曲双层石墨烯的光活性和量子转运的机制。使用有效的连续模型研究了双层系统中独特电子状态的形成。这种状态被证明支持两个石墨烯层中电子的横向运动的相关性。由于原子晶格的手性结构，这种阻力相关性的贡献不完全取消，因此导致光导率张量的阻力项。我们表明，电导率的阻力项是空间分散的表现。我们展示了如何分析和计算控制系统光学活性的电导率张量的组件。还计算了扭曲的双层石墨烯系统的直流电导率。它显示了在固有的费米能量上存在量子电导率值$ \ propto e^2/h $。
The mechanisms of optical activity and quantum transport of twisted bilayer graphene are studied. The formation of unique electron states in the bilayer systems is studied using an effective continuum model. Such states are shown to support the correlation of transverse motions of electrons in two graphene layers. Because of the chiral structure of the atomic lattices, the contribution of such drag correlations is incompletely cancelled, thus resulting in a drag term of the optical conductivity tensor. We show that the drag term of the conductivity is the manifestation of the spatial dispersion. We show how to analyze and calculate the components of the conductivity tensors that governs the optical activity of the systems. The DC conductivity of the twisted bilayer graphene system is also calculated. It shows the existence of a quantum conductivity value $\propto e^2/h$ at the intrinsic Fermi energy.
