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Non-Markovian behavior of ultrafast coherent ionization dynamics in a crystal exposed to a seeded free-electron-laser pulse

Title data

Brand, André ; Kaiser, Benjamin ; Vagov, Alexei ; Axt, Vollrath M. ; Pietsch, U.:
Non-Markovian behavior of ultrafast coherent ionization dynamics in a crystal exposed to a seeded free-electron-laser pulse.
In: Physical Review A. Vol. 89 (2014) Issue 6 . - Art.Nr. 063404, 10 S..
ISSN 0556-2791
DOI: https://doi.org/10.1103/PhysRevA.89.063404

Project information

Project financing: Bundesministerium für Bildung und Forschung

Abstract in another language

We investigate the ionization dynamics of a crystal structure driven by ultrafast coherent x-ray pulses of moderate to high intensities for excitations where dipole-allowed, single-photon ionization dominates. Using a simple model of the crystal, we demonstrate that quantum coherences may already play an important role at moderate pulse intensities, leading to qualitatively novel features which cannot be described by rate equations. In particular, the ionization may exhibit a minimum as a function of the pulse duration, where the ionization drops to almost zero, although during the pulse a noticeable fraction of the electrons is promoted to unbound states. For higher intensities, the qualitative deviations between the coherent quantum-mechanical treatment and the rate description is even more pronounced. In particular, due to the presence of quantum-mechanical coherences, the full theory predicts, even for the single-photon transitions to a continuum of free-electron states, a Rabi-type behavior similar to what is known for two-level systems.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: photoionization; ultrafast dynamics; ionization dynamics; high intensities; xuv; soft-x-ray; electron-electron correlations; free-electron laser; coherent regime; Accelerators; beams and electromagnetism; Photoionization of crystals; non-Markovian behavior
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 03 Nov 2017 08:56
Last Modified: 03 Nov 2017 08:56
URI: https://eref.uni-bayreuth.de/id/eprint/40263