Overview of project A07
Charge Transfer, Diffusion, and Lattice-Mediated Dynamics in Oxide Heterostructures
Optically induced charge transfer and charge carrier diffusion are central processes occurring in the non-equilibrium state after femtosecond laser excitation of solids and their heterostructures. Elucidating their microscopic nature and competing processes is highly relevant not only for a fundamental understanding of ultrafast charge carrier dynamics, but also with a view towards technological applications. This project aims at a microscopic analysis and manipulation of non-equilibrium charge transfer across the interfaces of perovskite oxide heterostructures, which serve as model systems with well-controlled properties, as well as charge carrier diffusion. We further aim to elucidate competing phonon-mediated dynamics leading to charge carrier trapping and energy transfer by interfacial phonon modes. Interface-sensitive non-linear optical spectroscopy and element-sensitive x-ray absorption spectroscopy will be employed as complementary femtosecond time-resolved probes.