Optical Response and Transport in Graphene

电子在石墨烯中的运动符合无质量中微子的Weyl方程。这个方程在零能点具有拓扑奇性，导致了各种有趣的现象。最耐人寻味的性质是抗磁磁化率的三角函数奇异性，通过多方面的理论研究阐明了这种奇异性的来源。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.