Controlling the electronic structure of graphene with light (B06)

我们的目的是用光控制外延单层和双层石墨烯的电子结构。为实现这一目标，我们将遵循两条主要道路。首先，我们将通过共振激发石墨烯晶格的红外主动振动来取代原子。其次，我们将利用光场与电子结构的直接耦合，从而形成flow - quiet - bloch态。我们选择的工具是时间和角度分辨光谱学（tr-ARPES）结合可变波长激发脉冲。与C1-C3项目一起，研究在光学晶格中使用费米子或玻色子量子气体的人造石墨烯，将研究常见的科学问题，例如载流子的带间动力学或拓扑绝缘体的实现。项目B4、B5及C9将发展配套的理论模型。

We aim at controlling the electronic structure of epitaxial monolayer and bilayer graphene with light. To achieve this, we will follow two main roads. First, we will displace the atoms by resonantly exciting IR-active vibrations of the graphene lattice. Second, we will exploit the direct coupling of the light field to the electronic structure, resulting in the formation of Flo-quet-Bloch states. Our tool of choice is time- and angle-resolved photoemission spectroscopy (tr-ARPES) combined with variable-wavelength excitation pulses. Together with projects C1-C3, which study artifical graphene with fermionic or bosonic quantum gases in optical lattices, common scientific questions will be investigated as for instance the interband dynamics of charge carriers or the realization of topological insulators.Supporting theoretical models will be developed in projects B4, B5 and C9.