Non-equilibrium dynamics in solids probed by terahertz fields (B08#)

在这个项目中，我们将使用超快太赫兹(THz)光谱来研究固体中电子和晶格的非平衡动力学。超快太赫兹光谱是一种基于飞秒激光的全光学方法，非常适合于探测材料的导电性，包括其超快动力学。在第一个资助期，我们将集中讨论电导率动力学的两个关键主题。1)光致发光金属Bi、Sb和As发生超快光致结构相变；2)石墨烯中第一次热化过程中热电子布居的亚100fs动力学；以及石墨烯的直接晶格激发对其电导的影响。

In this project we will use ultrafast terahertz (THz) spectroscopy to study the non-equilibrium dynamics of electrons and the lattice in solids. Ultrafast THz spectroscopy is a femtosecond-laser based, all-optical method, ideally suited to probe the conductivity of materials, including its ultrafast dynamics. In the first funding period we will concentrate on the two key topics of the electric conductivity dynamics. 1) Photoexcited pnictogen metals Bi, Sb and As undergoing the ultrafast photoinduced structural phase transition; 2) Sub-100 fs dynamics of hot electron population in graphene, undergoing the primary thermalization process; and the effect of direct lattice excitation of graphene on its conductivity.