Exploring Optical Properties of single wall carbon Nanotubes

碳纳米管是将石墨烯薄片卷成圆柱体。根据纳米管的直径和滚动方式，我们得到了许多不同的纳米管结构。特别是，根据碳纳米管的直径或结构，碳纳米管的电子性质表现为金属或半导体。拉曼光谱测量光的非弹性散射，是测量碳纳米管结构和物理性质的有力工具。在这个5年的项目中，我们发表了约70篇论文，从理论上提出了新的光谱技术，如(1)门调制拉曼光谱，(2)相干声子光谱，(3)激子光物理，与世界上的实验小组密切合作。

Carbon nanotube is a roll-up graphene sheet into a cylinder. Depending on the diameter and the way to roll, we get many different structures of the nanotube. In particular, depending on the diameter or the structure of the carbon nanotube, the electronic property of a carbon nanotube shows either metallic or semiconducting. Raman spectroscopy, which measures inelastic scattering of light, is a powerful tool to measure the structure and physical properties of carbon nanotubes. In this 5 years project, we published about 70 papers in which we theoretically propose new techniques of spectroscopy such as (1) gate modulated Raman spectroscopy and (2) coherent phonon spectroscopy and (3) exciton photophysics in a strong collaboration with experimental group in the world.