Free-electron lasers and high-harmonic-generation table-top systems are new sources of
extreme-ultraviolet to hard X-ray photons, providing ultrashort pulses that are intense …

The metal centres in metalloenzymes and molecular catalysts are responsible for the
rearrangement of atoms and electrons during complex chemical reactions, and they enable …

We present the first lasing results of SwissFEL, a hard X-ray free-electron laser (FEL) that
recently came into operation at the Paul Scherrer Institute in Switzerland. SwissFEL is a very …

Optical-domain transient grating (TG) spectroscopy is a versatile background-free four-wave-
mixing technique that is used to probe vibrational, magnetic and electronic degrees of …

All-optical switching (AOS) results in ultrafast and deterministic magnetization reversal upon
single laser pulse excitation, potentially supporting faster and more energy-efficient data …

Two-dimensional (2D) spectroscopy, originally developed for nuclear magnetic resonance,
has been recently extended to the infrared and visible regimes. In this technique sequences …

Free electron lasers operating in the soft and hard X-ray regime provide capabilities for
ultrafast science in many areas, including X-ray spectroscopy, diffractive imaging, solution …

We investigate the propagation of magnons after ultrashort perturbations of the exchange
interaction in the prototype two-dimensional Heisenberg antiferromagnet. Using the recently …

We demonstrate that the absorption of femtosecond hard x-ray pulses excites
quasispherical, high-amplitude, and high-wave-vector coherent acoustic phonon wave …

Recent advances in ultrafast extreme ultraviolet (EUV) and x-ray light sources provide direct
access to fundamental time and length scales for biology, chemistry, and materials physics …