Daria Popova-Gorelova, Universität Hamburg

Abstract:

Revolutionary advances in ultrafast light sources such as x-ray free-electron lasers and extreme ultraviolet table-top sources
enable real-time movies of electronic transformations. Such movies became a reality thanks to the advent of attosecond x-ray
pulses with wavelengths comparable to interatomic distances in a crystal and durations shorter than the natural time scale of
electronic motion. Attosecond x-ray pulses can image electron dynamics during the process of coherent light control, when optical
pulses manipulate electronic, magnetic or structural properties of matter.

Attosecond x-ray pulses interacting with a solid while it is coherently controlled by light lead to a time-resolved signal that
encodes fingerprints of microscopic light-driven electron dynamics. We developed a theory that describes attosecond x-ray imaging of an electron system during the time it is nonperturbatively driven by an optical pulse [1,2]. Based on this theory, we propose a method to reconstruct real-time microscopic dynamics in crystals using ultrashort, subcycle-resolved x-ray pulses [3].

[1] D. Popova-Gorelova, D. A. Reis, and R. Santra, “Theory of xray scattering from laser-driven electronic systems,” Phys. Rev. B
98, 224302, 2018
[2] D. Popova-Gorelova and R. Santra, “Imaging laser-driven electron dynamics in solids on atomic scale with subcycle-resolved
x-ray-optical wave mixing.” arXiv:2012.10334
[3] D. Popova-Gorelova, V. A. Guskov, and R. Santra, “Microscopic electron dynamics in nonlinear optical response of solids.” arXiv:2009.07527

Poster Session Link: https://gather.town/invite?token=0pEoq7VP

If you have any questions for the presenter, please contact them via email: darya.gorelova@uni-hamburg.de