Optical Response and Transport in Graphene

石墨烯中的电子运动由无质量中微子的Weyl方程控制。这个方程在零能量处具有拓扑奇异性，导致各种有趣的现象。最有趣的性质是δ函数奇异性的抗磁磁化率，从理论上阐明了从多方面研究的起源。对输运性质的影响也是深入研究的主题，包括磁-声子共振。研究了环境对碳纳米管中激子的影响。

The electron motion in graphene is governed by the Weyl equation for massless neutrino. This equation has a topological singularity at zero energy, leading to various interesting phenomena. The most intriguing property is the delta-function singularity in the diamagnetic susceptibility, the origin of which is clarified through theoretical studied from various aspects. Effects on transport properties are also the subject of the intensive study, including the magneto-phonon resonance. Environment effects on excitons in carbon nanotubes are also studied.