Ångstrom and attosecond are the fundamental spatiotemporal scales for electron dynamics
in various materials. Although attosecond pulses with wavelengths comparable to the atomic …

The detailed understanding of electronic coherence in quantum systems requires
measurements on the attosecond timescale. Attosecond x-ray pulses enable the study of …

We report on attosecond-scale control of high-harmonic and fast electron emission from
plasma mirrors driven by relativistic-intensity near-single-cycle light waves at a kHz …

Quantum coherence governs the outcome and efficiency of photochemical reactions and
ultrafast molecular dynamics. Recent ultrafast gas-phase X-ray scattering and electron …

The solitonlike superradiant regime of free-electron lasers (FEL) offers a promising path
towards ultrashort pulses, beyond the natural limit dictated by the bandwidth of the high-gain …

A recently introduced theoretical framework for modeling the dynamics of x-ray amplified
spontaneous emission is based on stochastic sampling of the density matrix of quantum …

This study delves into the relatively uncharted territory of Above Threshold Ionization in
atoms, triggered by intense X-ray radiation fields. At these frequencies, the energy of a …

Attosecond X-ray pulses are the key to studying electron dynamics at their natural time scale
involving specific electronic states. They are promising to build the conceptual bridge …

Attosecond x-ray pulses play a crucial role in the study of ultrafast phenomena involving
inner and valence electrons. Especially isolated attosecond pulses with high photon energy …

In coherent radiation of an ensemble of electrons, the radiation field from electrons
resonantly drives the other electrons inside to produce stimulated emission. The radiation …