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

Titelangaben

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. Bd. 89 (2014) Heft 6 . - Art.Nr. 063404, 10 S..
ISSN 0556-2791
DOI: https://doi.org/10.1103/PhysRevA.89.063404

Angaben zu Projekten

Projektfinanzierung: Bundesministerium für Bildung und Forschung

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
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
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 03 Nov 2017 08:56
Letzte Änderung: 03 Nov 2017 08:56
URI: https://eref.uni-bayreuth.de/id/eprint/40263