Journal
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
Volume 257, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.elspec.2022.147189
Keywords
Out-of-equilibrium many-body; Ab-initio methods; Excitons; Coherence and de-coherence
Categories
Funding
- European Union [676598, 824143]
- Nanoscience Foundries and Fine Analysis-Europe [654360]
- MIUR PRIN [20173B72NB]
- INFN through the TIME2QUEST project
- Tor Vergata University through the Beyond Borders Project ULEXIEX
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Coherence and de-coherence are the most fundamental steps following the initial photo-excitation in pump-and-probe experiments, determining the system's dynamics. These effects are related to the concepts of populations and oscillations, and are influenced by correlation effects stimulated by the photo-excitation.
Coherence and de-coherence are the most fundamental steps that follow the initial photo-excitation occurring in typical pump-and-probe experiments. Indeed, the initial external laser pulse transfers coherence to the system in terms of creation of multiple electron-hole pairs excitation. The excitation concurs both to the creation of a finite carriers density and to the appearance of induced electromagnetic fields. The two effects, to a very first approximation, can be connected to the simple concepts of populations and oscillations. The dynamics of the system following the initial photo-excitation is, thus, entirely dictated by the interplay between coherence and de-coherence. This interplay and the de-coherence process itself, is due to the correlation effects stimulated by the photo-excitation. Single-particle, like the electron-phonon, and two-particles, like the electron-electron, scattering processes induce a complex dynamics of the electrons that, in turn, makes the description of the correlated and photo-excited system in terms of pure excitonic and/or carriers populations challenging.
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