Correlated electron and structural dynamics in quasi-2D Hybrid Perovskites

混合卤化铅钙钛矿是目前因其在光电子器件中的应用而引起广泛兴趣的材料。它们的准二维等效物显示出比3D化合物更高的稳定性，并提供了调整面外屏蔽特性的可能性。在这里，我们建议在超快时间尺度上监测并发激发态和屏蔽动力学。时间分辨的光电子，光致发光和高场太赫兹激发将提供互补的意见纠缠自由度。特别是，我们的目标是遵循激子的形成，量化的自旋-轨道相互作用，并控制屏蔽效应由于动态无序，阳离子取向和电子约束;所有这些都是潜在的成分Rashba分裂和铁电性在这种材料类。我们的研究项目将为非平衡物理学提供新的见解，并可能导致材料优化的新策略。

Hybrid lead halide perovskites are materials that currently attract widespread interest for their application in optoelectronic devices. Their quasi two-dimensional equivalents have shown higher stability than the 3D compounds and offer the possibility to tune the out-of-plane screening properties. Here, we propose to monitor concurrent excited state and screening dynamics on ultrafast timescales. Time resolved photoemission, photoluminescence and high-field THz excitation will provide complementary views on the entangled degrees of freedom. In particular, we aim to follow the exciton formation, quantify the spin-orbit interaction, and control screening effects due to dynamic disorder, cation orientation and electronic confinement; all of these being potential ingredients for Rashba splitting and ferroelectricity in this material class. Our research project will offer novel insights on non-equilibrium physics and might as well lead to new strategies for materials optimization.