European XFEL Science Seminar

Ultrafast multiplex electron cinema with soft x-ray laser flashes at SASE3/SXP

by Prof. Kai Rossnagel (Christian-Albrechts-Universität zu Kiel & Deutsches Elektronen-Synchrotron DESY)


Electrons move the world, they drive our electronic devices and all chemical reactions in nature. If we want to understand and control electron motion, we have to capture it in action in the nanocosms of materials and at interfaces. Since electrons in materials are fast, with velocities up to a few nm/fs, and bound to varying degrees, with binding energies ranging from zero at the Fermi level to a few keV for intermediate core levels, we need femtosecond soft x-ray flashes to strip them of materials and capture them on film.

Here, we report on our mission to record and direct electronic films in quantum materials and at functional interfaces by complete femtostroboscopic soft x-ray photoelectron spectroscopy. The approach provides comprehensive information on fundamental electronic structure dynamics, including spin dynamics, in energy-momentum space (using time- and spin-resolved ARPES) combined with atomic site-specific chemical and structural dynamics in real space (using time-resolved XPS and XPD). In a single experiment, we will be able to simultaneously track the motion of electrons, spins, and atoms on their natural time scales. Moreover, using ultrashort pump pulses with tunable wavelengths and shapeable wavefronts, this ultrafast multimodal one-stop technique will become a powerful tool to discover and generate novel hidden and transient phases of quantum matter.

The talk gives an overview of the technological basics and scientific opportunities of complete ultrafast soft x-ray photoelectron spectroscopy at SASE3/SXP.

Join Zoom Meeting

Meeting ID: 933 4302 4167
Passcode: 932501

Organized by

Serguei Molodtsov / Gabriella Mulá-Mathews