Speaker
Description
Electrons have little mass and they are strongly interacting with their environment via Coulomb forces which led to their dynamics appearing perfectly synchronized to external stimuli. E.P. Wigner and colleagues anticipated already in the 1950's that in photoionization a time shift between the outgoing electronic wavepacket and the arrival time of the incoming photon is to be expected due to the phase shift derivative associated to this half-scattering event. Nonetheless, it took another half century to develop experiments capable of tracking this time delay in photoemission [1] which laid the ground for the ultrafast control of the electronic&magnetic state of solids [2] and for the development of attosecond spectroscopy into a truly space-time-resolved microscopy technology [3]
[1] Science 328, 5986 (2010)
[2] Nature 571, 240–244 (2019)
[3] Science 380, 6640 (2023)
