Understanding the ultrafast evolution of atomic and electronic rearrangements under
nonequilibrium conditions in organic, inorganic and biological materials plays a …

The electron-phonon coupling and the corresponding energy exchange are investigated
experimentally and by ab initio theory in nonequilibrium states of the free-electron metal …

Many fundamental processes of structural changes at surfaces occur on a pico-or
femtosecond timescale. In order to study such ultrafast processes, we have combined …

The control of optically driven high-frequency strain waves in nanostructured systems is an
essential ingredient for the further development of nanophononics. However, broadly …

Here, using ultrafast electron crystallography (UEC), we report the observation of rippling
dynamics in suspended monolayer graphene, the prototypical and most-studied 2D …

Tip-based photoemission electron sources offer unique properties for ultrafast imaging,
diffraction, and spectroscopy experiments with highly coherent few-electron pulses …

Time-resolved diffraction with femtosecond electron pulses has become a promising
technique to directly provide insights into photo induced primary dynamics at the atomic …

Ultrafast electron diffraction allows the tracking of atomic motion in real time, but space
charge effects within dense electron packets are a problem for temporal resolution. Here, we …

We demonstrate ultrafast core-electron energy-loss spectroscopy in four-dimensional
electron microscopy as an element-specific probe of nanoscale dynamics. We apply it to the …

We experimentally and numerically investigate the performance of an advanced ultrafast
electron source, based on two-photon photoemission from a tungsten needle cathode …