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 that is why this website is still activ. The website of new group is here.
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
