Theoretical study of time-resolved photoemission spectroscopy for low-dimensional electron-phonon system

时间分辨光电子能谱(TRPES)是目前最先进的光谱学技术，它可以实时监测在光激发下电子结构(尤其是费米能级附近)的变化。它不仅在实验上是一个挑战，而且在理论上也是一个挑战，因为它的理论表述仍然缺乏。通过发展我们的原始公式，我们从理论上研究了一维有机绝缘体和准二维无间隙半导体石墨中的TRPES。对于电子和声子的超快动力学对底层电子结构的影响，可以有新的微观理解。

Time-resolved photoemission spectroscopy (TRPES) is the state-of-the-art spectroscopy technology which makes it possible to monitor the real-time change of the electronic structure (especially, near the Fermi level) under the optical excitation. It is a challenge not only in experiment but also in theory in a sense that its theoretical formulation is still lacking. Through developing our original formulation, we theoretically study TRPES in 1-imensional organic insulator, and graphite, quasi 2-dimensional gapless semiconductor. Novel microscopic understanding about the effects of ultrafast dynamics of electron and phonon on the underlying electronic structure could be made.