Within this research field, we develop techniques to image microscopic charge and spin rearrangements during the interaction of a crystal with an optical pulse. In particular, we use the Floquet formalism to describe the action of a pump pulse on a crystal beyond the perturbation theory. We describe how probe x-ray pulses interact with such laser-driven systems. Based on this analysis, we show how to retrieve information about charge and spin rearrangements of laser-driven systems on an atomic scale.

Microscopic nonlinear optical response of alpha-quartz crystal and a corresponding x-ray signal, picture from Commun Phys 7, 317 (2024)

Our ab initio scheme to calculate microscopic optical response:

https://pubs.aip.org/aca/sdy/article/11/1/014102/3267224

Our theory of x-ray diffraction from laser-driven electron systems:

https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.224302

Perspective article:

https://iopscience.iop.org/article/10.1088/1361-6455/ad5fd4/meta

Time-resolved imaging of laser-driven electron dynamics:

https://www.nature.com/articles/s42005-024-01810-7