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Título
Attosecond x-ray transient absorption in condensed-matter: a core-state-resolved Bloch model.
Autor(es)
Fecha de publicación
2019-04
Editor
IOP Publishing [Commercial Publisher]
Citación
Picón, A., Plaja, L., & Biegert, J. (2019). Attosecond x-ray transient absorption in condensed-matter: A core-state-resolved Bloch model. New Journal of Physics, 21(4). https://doi.org/10.1088/1367-2630/ab1311
Resumen
[EN]Attosecond transient absorption is an ultrafast technique that has opened the possibility to study electron dynamics in condensed matter systems at its natural timescale. The extension to the x-ray regime permits one to use this powerful technique in combination with the characteristic element specificity of x-ray spectroscopy. At these timescales, the coherent effects of the electron transport are essential and have a relevant signature on the absorption spectrum. Typically, the complex light-driven dynamics requires a theoretical modeling for shedding light on the time-dependent changes in the spectrum. Here we construct a semiconductor Bloch equation model for resolving the light-induced and core-electron dynamics simultaneously, which enables to easily disentangle the interband and intraband contributions. By using the Bloch model, we demonstrate a universal feature on attosecond x-ray transient absorption spectra that emerges from the light-induced coherent intraband dynamics. This feature is linked to previous studies of light-induced Fano resonances in atomic systems.
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