Time-resolved ARPES of solids – entering the strong-field regime

在该项目中，我们的目标是研究固体中的光-物质相互作用，超越传统的微扰单光子吸收制度，使用时间和角度分辨光电发射（trARPES）。在我们的研究中，我们将重点关注由拉比振荡和光-物质相互作用的弱场到强场转变机制中的强场朗道-齐纳-斯图克尔伯格干涉引起的石墨烯和石墨中电子激发的能量-动量分布的特征特征。该项目的中心目标是探索峰值电场强度区域的范围，在该区域可以以合理的方式进行trARPES实验，研究石墨烯和石墨中的退相过程影响超出微扰弱场极限的轻物质相互作用过程，并将该项目提供的光谱分辨实验数据与积分强-考虑模型计算的石墨烯的场光电流测量。据我们所知，迄今为止还没有进行过固体中强场效应的trARPES实验。因此，拟议的项目可能会铺平道路，建立一个新的和令人兴奋的战略探测光物质相互作用过程超出了传统的微扰单光子吸收制度，使用一个非常直接的实验方法。

Within the project we aim for studying light-matter interaction in solids beyond the conventional perturbative single photon absorption regime using time- and angle-resolved photoemission (trARPES). In our studies we will focus on characteristic signatures in the energy-momentum distribution of electronic excitations in graphene and graphite resulting from Rabi oscillations and strong-field Landau-Zener-Stückelberg interferences in the weak-field to strong-field transition regime of light-matter interaction. Central goals of the project are the exploration of the extent of the peak electric field strength regime at which trARPES experiments can be performed in a reasonable manner, the study of dephasing processes in graphene and graphite affecting light-matter interaction processes beyond the perturbative weak-field limit, and the systematic comparison of spectrally resolved experimental data provided by this project with integral strong-field photocurrent measurements of graphene under consideration of model calculations. To the best of our knowledge, trARPES experiments on strong-field effects in solids have not been conducted so far. The proposed project may therefore pave the way for establishing a novel and exciting strategy for probing light-matter interaction processes beyond the conventional perturbative single photon absorption regime using an extremely direct experimental approach.