Entangled Valence Electron–Hole Dynamics Revealed by Stimulated Attosecond X‑ray Raman Scattering

We show that broadband X-ray pulses can create wavepackets
of valence
electrons and holes localized in the vicinity of a selected atom (nitrogen,
oxygen, or sulfur in cysteine) by stimulated resonant Raman scattering.
The subsequent dynamics reveals highly correlated motions of entangled
electron and hole quasiparticles. This information goes beyond the
time-dependent total charge density derived from X-ray diffraction.