Research
The group leader, Daria Gorelova, moved to Brandenburg University of Technology in Cottbus, Germany in September 2024 and became a W2 Professor. A part of the group stays in Hamburg under her supervision.
Our research group develops novel methods to follow ultrafast processes in molecules and solid-state systems by means of attosecond and femtosecond x-ray and XUV pulses employing analysis within quantum electrodynamics. We develop a theoretical and a computational framework to describe how to follow electron, exciton, spin, coupled electron- and exciton-lattice dynamics by means of ultrashort x-ray pulses with (sub-)femtosecond time resolution and sub-nanometer spatial resolution. We consider time- and angle-resolved photoelectron spectroscopy, time- and momentum-resolved RIXS, and energy-resolved Bragg diffraction.
Imaging laser-driven electron and spin dynamics
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.
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
Our calculation scheme:
Microscopic nonlinear optical response of alpha-quartz crystal and a corresponding x-ray signal, picture from Commun Phys 7, 317 (2024):
Attosecond and femtosecond imaging with momentum microscopy (trARPES)
Attosecond XUV imaging with photoelectrons proposed by our theory:
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.94.013412
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.023101
Time-resolved momentum microscopy, experiment and theory:
https://www.nature.com/articles/s41467-022-30404-6
https://www.cui-advanced.uni-hamburg.de/en/research/wissenschaftsnews/22-05-18-surface.html
