We put forward a first-principle nonequilibrium Green's-function (NEGF) approach to calculate the transient photoabsorption spectrum of optically thin systems. The method can deal with pump fields of arbitrary strength, frequency, and duration as well as overlapping and nonoverlapping pump and probe pulses. The electron-electron repulsion is accounted for by the correlation self-energy, and the resulting numerical scheme deals with matrices that scale quadratically with the system size. Two recent experiments, the first on helium and the second on krypton, are addressed. For the first experiment we explain the bending of the Autler-Townes absorption peaks with increasing pump-probe delay τ and relate the bending to the thickness and density of the gas. For the second experiment we find that sizable spectral structures of the pump-generated admixture of Kr ions are fingerprints of dynamical correlation effects, and hence they cannot be reproduced by time-local self-energy approximations. Remarkably, the NEGF approach also captures the retardation of the absorption onset of Kr2+ with respect to Kr1+ as a function of τ.

Perfetto, E., Uimonen, A., Van Leeuwen, R., Stefanucci, G. (2015). First-principles nonequilibrium Green's-function approach to transient photoabsorption: application to atoms. PHYSICAL REVIEW A, 92(3) [10.1103/PhysRevA.92.033419].

First-principles nonequilibrium Green's-function approach to transient photoabsorption: application to atoms

Perfetto, E;STEFANUCCI, GIANLUCA
2015-01-01

Abstract

We put forward a first-principle nonequilibrium Green's-function (NEGF) approach to calculate the transient photoabsorption spectrum of optically thin systems. The method can deal with pump fields of arbitrary strength, frequency, and duration as well as overlapping and nonoverlapping pump and probe pulses. The electron-electron repulsion is accounted for by the correlation self-energy, and the resulting numerical scheme deals with matrices that scale quadratically with the system size. Two recent experiments, the first on helium and the second on krypton, are addressed. For the first experiment we explain the bending of the Autler-Townes absorption peaks with increasing pump-probe delay τ and relate the bending to the thickness and density of the gas. For the second experiment we find that sizable spectral structures of the pump-generated admixture of Kr ions are fingerprints of dynamical correlation effects, and hence they cannot be reproduced by time-local self-energy approximations. Remarkably, the NEGF approach also captures the retardation of the absorption onset of Kr2+ with respect to Kr1+ as a function of τ.
2015
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - FISICA DELLA MATERIA
English
Atomic and Molecular Physics; Optics
http://harvest.aps.org/bagit/articles/10.1103/PhysRevA.92.033419/apsxml
Perfetto, E., Uimonen, A., Van Leeuwen, R., Stefanucci, G. (2015). First-principles nonequilibrium Green's-function approach to transient photoabsorption: application to atoms. PHYSICAL REVIEW A, 92(3) [10.1103/PhysRevA.92.033419].
Perfetto, E; Uimonen, A; Van Leeuwen, R; Stefanucci, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/173974
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