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Título
Spectral signature of back reaction in correlated electron dynamics in intense electromagnetic fields
Autor(es)
Palabras clave
Electron correlation calculations for atoms & ions
High-order harmonic generation
Multiphoton or tunneling ionization & excitation
Strong electromagnetic field effects
Strong field excitation
Strong-field-induced spectra
Ultrafast phenomena
Ultrashort pulses
Fecha de publicación
2020-07
Citación
de las Heras, A., Hernández-García, C., & Plaja, L. (2020). Spectral signature of back reaction in correlated electron dynamics in intense electromagnetic fields. Physical Review Research, 2(3), 033047. Open Access: Si. https://doi.org/10.1103/PhysRevResearch.2.033047
Resumen
Few-electron atoms interacting with electromagnetic fields provide for privileged scenarios for disentangling elemental correlation mechanisms. We demonstrate that high-order harmonic generation (HHG) from neutral helium presents a distinctive trace of correlation back reaction in the electron dynamics prior to ionization. We identify a mechanism in which the field interacts with one of the electrons, while the second is excited to a Rydberg level through the Coulomb interaction. As back response to this correlated excitation, the first electron is knocked down to a lower level, from which it ionizes to generate high-order harmonics. Unlike other multielectron phenomena, where the electron-field interaction is modified by cross correlations with the rest of the interacting electrons, back reaction is a mechanism of autocorrelation. Our numerical simulations reveal back reaction as a relevant aspect in HHG from correlated two-electron systems, and paves the way to disentangle valence electron-electron correlation dynamics using high-harmonic spectroscopy.
Descripción
Datos de investigación en: http://hdl.handle.net/10366/148373
URI
DOI
10.1103/PhysRevResearch.2.033047
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