Overview of project A07

Charge Transfer, Diffusion, and Lattice-Mediated Dynamics in Oxide Heterostructures

Eschenlohr, Ollefs

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.

A07Charge Transfer, Diffusion, and Lattice-Mediated Dynamics in Oxide Heterostructures



Nico Rothenbach, Markus Ernst Gruner, Katharina Ollefs, Carolin Schmitz-Antoniak, Soma Salamon, Ping Zhou, Renkai Li, Mianzhen Mo, Suji Park, Xiaohong Shen, Stephen P. Weathersby, Jun Yang, Xijie Wang, Ondrej Šipr, Hubert Ebert, Klaus Sokolowski-Tinten, Rossitza Pentcheva, Uwe Bovensiepen, Andrea Eschenlohr and Heiko Wende
Effect of Lattice Excitations on Transient Near-Edge X-Ray Absorption Spectroscopy
Phys. Rev. B 104, 144302 (2021)
DOI: 10.1103/PhysRevB.104.144302



Andrea Eschenlohr
Spin Dynamics at Interfaces on Femtosecond Timescales
J. Phys: Cond. Matter 33, 013001 (2020)
DOI: 10.1088/1361-648x/abb519