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

在该项目中，我们的目标是使用时间和角度分辨光发射（trARPES）研究固体中超越传统微扰单光子吸收机制的光-物质相互作用。在我们的研究中，我们将重点研究石墨烯和石墨烯中电子激发的能量-动量分布的特征特征，这些特征是由光-物质相互作用弱场到强场过渡状态下的Rabi振荡和强场landau - zener - st<s:1> ckelberg干涉引起的。该项目的中心目标是探索峰值电场强度的范围，在该范围内，trARPES实验可以以合理的方式进行，研究石墨烯的减相过程和石墨在微扰弱场极限之外影响光-物质相互作用过程。并将本项目提供的光谱分辨实验数据与考虑模型计算的石墨烯整体强场光电流测量数据进行了系统比较。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，拟议的项目可能为建立一种新颖而令人兴奋的策略铺平道路，该策略可以使用极其直接的实验方法来探测超越传统的微扰单光子吸收机制的光物质相互作用过程。

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.