超快二维电子光谱与激发态动力学(特邀)

Ultrafast Two-dimensional Electronic Spectroscopy and Excited-state Dynamics(Invited)

超快二维电子光谱是一种用于探测激发态动力学的重要手段,由于其具有时间分辨力高、可探测均匀展宽与非均匀展宽、可提供丰富的相干动力学信息等特点,近年来被广泛应用于光合作用、光伏电池材料、量子点与二维材料等的动力学研究中。本文从傅里叶变换光谱、瞬态光栅等与超快二维电子光谱紧密相关的基本概念出发,简要阐述超快二维电子光谱的基本原理。通过例举二维电子光谱在光合作用蛋白与光伏电池材料的应用研究,介绍二维光谱的特色以及应用范围。最后,对二维光谱研究存在的挑战以及未来研究方向进行探讨。

Ultrafast Two-Dimensional Electronic Spectroscopy(2DES)has emerged as a powerful tool to probe excited-state dynamics in photosynthesis,photovoltaic materials,quantum dots,and twodimensional materials in recent years.Compared to one-dimensional time-resolved spectroscopy,2DES not only contains one additional dimension to resolve excited-state dynamics but also provides rich information about homogeneous and inhomogeneous broadening,intermolecular coupling and coherent dynamics that are not fully accessible to the traditional third-order spectroscopic methods.Here we will briefly introduce the principle of 2DES from the basic concepts such as Fourier-transform linear spectroscopy,and transient grating.Subsequently,we will illustrate the applications of 2DES in the context of recent studies of spectral broadening in two-dimensional materials,and charge separation and coherent dynamics in photosynthesis and photovoltaic materials.Finally,we will discuss the remaining challenges and exciting future directions for the fields of 2DES.