Halide perovskites (HPs) are potential game-changing materials for a broad spectrum of
optoelectronic applications ranging from photovoltaics, light-emitting devices, lasers to …

This review is focused on free-electron lasers (FELs) in the hard to soft x-ray regime. The
aim is to provide newcomers to the area with insights into: the basic physics of FELs, the …

The understanding of how spins move and can be manipulated at pico-and femtosecond
timescales has implications for ultrafast and energy-efficient data-processing and storage …

A material's magnetic state and its dynamics are of great fundamental research interest and
are also at the core of a wide plethora of modern technologies. However, reliable access to …

The recent construction of free electron lasers allows extending laboratory-based laser
experiments to shorter wavelengths, accessing wavevectors typical of nanoscale dynamics …

Collective lattice dynamics determine essential aspects of condensed matter, such as elastic
and thermal properties. These exhibit strong dependence on the length-scale, reflecting the …

Ultrafast laser excitation of a metal causes correlated, highly nonequilibrium dynamics of
electronic and ionic degrees of freedom, which are, however, only poorly captured by the …

The magneto-optical and opto-magnetic effects describe the interaction of light with a
magnetic medium. The most prominent examples are the Faraday and Cotton-Mouton …

This review discusses picosecond ultrasonics experiments using ultrashort hard x-ray probe
pulses to extract the transient strain response of laser-excited nanoscopic structures from …

By combining interface-sensitive nonlinear magneto-optical experiments with femtosecond
time resolution and ab initio time-dependent density functional theory, we show that optically …