报告题目：Electronic Structure and Optical Response of Low-dimensional Structures
报告摘要：Low-dimensional structures have attracted significant interests because of their unique electrical and optical properties. In this talk, I will give a brief review about our first-principles simulations on the electronic structure and optical response of a few typical reduced dimensional structures, from one-dimensional nanowires and nanoribbons to two-dimensional graphene and fluorinated graphene. Beyond the usual density functional theory, an ab-initio approach based on the many-body perturbation theory is introduced to calculate the quasiparticle energy and optical absorption spectra of solids. I will also show how this state-of-art calculation explains available experimental measurements of nanostructures and, more importantly, predicts novel features of new materials in a quantitative way.