Stefan Donsa
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View article: Dynamical quasi-condensation in the weakly interacting Fermi-Hubbard model
Dynamical quasi-condensation in the weakly interacting Fermi-Hubbard model Open
We study dynamical (quasi)-condensation in the Fermi-Hubbard model starting from a completely uncorrelated initial state of adjacent doubly occupied sites. We show that upon expansion of the system in one dimension, dynamical (quasi)-conde…
View article: Nonequilibrium correlation dynamics in the one-dimensional Fermi-Hubbard model: A testbed for the two-particle reduced density matrix theory
Nonequilibrium correlation dynamics in the one-dimensional Fermi-Hubbard model: A testbed for the two-particle reduced density matrix theory Open
We explore the nonequilibrium dynamics of a one-dimensional Fermi-Hubbard system as a sensitive testbed for the capabilities of the time-dependent two-particle reduced density matrix (TD2RDM) theory to accurately describe time-dependent co…
View article: Non-equilibrium correlation dynamics in the one-dimensional Fermi-Hubbard model: A testbed for the two-particle reduced density matrix theory
Non-equilibrium correlation dynamics in the one-dimensional Fermi-Hubbard model: A testbed for the two-particle reduced density matrix theory Open
We explore the non-equilibrium dynamics of a one-dimensional Fermi-Hubbard system as a sensitive testbed for the capabilities of the time-dependent two-particle reduced density matrix (TD2RDM) theory to accurately describe time-dependent c…
View article: Canonical Density Matrices from Eigenstates of Mixed Systems
Canonical Density Matrices from Eigenstates of Mixed Systems Open
One key issue of the foundation of statistical mechanics is the emergence of equilibrium ensembles in isolated and closed quantum systems. Recently, it was predicted that in the thermodynamic (N→∞) limit of large quantum many-body systems,…
View article: Zeptosecond Angular Streak Camera
Zeptosecond Angular Streak Camera Open
Time-resolved electronic processes on the attosecond scale have recently become experimentally accessible through the development of laser-based pump-probe interrogation techniques such as the attosecond streak camera, the reconstruction o…
View article: The speed limit of optoelectronics
The speed limit of optoelectronics Open
Light-field driven charge motion links semiconductor technology to electric fields with attosecond temporal control. Motivated by ultimate-speed electron-based signal processing, strong-field excitation has been identified viable for the u…
View article: Phase delays in $\omega-2\omega$ above-threshold ionization
Phase delays in $\omega-2\omega$ above-threshold ionization Open
Relative phases of atomic above-threshold ionization wavepackets have been investigated in a recent experiment [L. J. Zipp, A. Natan, and P. H. Bucksbaum, Optica \textbf{1}, 361-364 (2014)] exploiting interferences between different pathwa…
View article: Tuning canonical typicality by quantum chaos
Tuning canonical typicality by quantum chaos Open
One key issue of the foundation of statistical mechanics is the emergence of equilibrium ensembles in isolated and closed quantum systems. Recently, it was predicted that in the thermodynamic ($N \rightarrow \infty$) limit the density mat…
View article: Chaos-induced loss of coherence of a Bose-Einstein condensate
Chaos-induced loss of coherence of a Bose-Einstein condensate Open
The mean-field limit of a bosonic quantum many-body system is described by (mostly) non-linear equations of motion which may exhibit chaos very much in the spirit of classical particle chaos, i.e. by an exponential separation of trajectori…
View article: Towards the complete phase profiling of attosecond wave packets
Towards the complete phase profiling of attosecond wave packets Open
ISSN:2643-1564
View article: Angle-resolved time delays for shake-up ionization of helium
Angle-resolved time delays for shake-up ionization of helium Open
Recent angle-resolved RABBITT experiments have shown that the photoionization time delay depends on the emission angle of the photoelectron. In this work we demonstrate that for photoemission from helium accompanied by shake-up (correlatio…
View article: Theory of Subcycle Linear Momentum Transfer in Strong-Field Tunneling Ionization
Theory of Subcycle Linear Momentum Transfer in Strong-Field Tunneling Ionization Open
Interaction of a strong laser pulse with matter transfers not only energy but also linear momentum of the photons. Recent experimental advances have made it possible to detect the small amount of linear momentum delivered to the photoelect…
View article: Time delays from one-photon transitions in the continuum
Time delays from one-photon transitions in the continuum Open
Attosecond photoionization time delays reveal information about the potential energy landscape that an outgoing electron wavepacket probes upon ionization. In this study, we experimentally quantify the dependence of the time delay on the a…
View article: RABBITT attoclock for the direct measurement of ionization phases
RABBITT attoclock for the direct measurement of ionization phases Open
Synopsis We use a circularly polarized attosecond pulse train (APT) together with a weak replica of the fundamental circularly polarized infra-red (IR) field to reconstruct the ionization phase of the dipole allowed (2s2p) 1 P° resonance i…
View article: Real-time reconstruction of the strong-field driven dipole response
Real-time reconstruction of the strong-field driven dipole response Open
Synopsis Using ultrashort and phase-locked laser pulses, combined with an in situ measurement of a reference pulse, we present a method capable of retrieving the nonlinearly perturbed time-dependent response function of a quantum system dr…
View article: Subcycle transfer of photon momentum in nondipole tunneling ionization
Subcycle transfer of photon momentum in nondipole tunneling ionization Open
Synopsis We study the subcycle transfer of photon momentum in tunneling ionization beyond the dipole approximation using the attoclock setup. We separate the momentum transfer during tunneling and propagation in continuum using the backpro…
View article: Circular Holographic Ionization-Phase Meter
Circular Holographic Ionization-Phase Meter Open
We propose an attosecond extreme ultraviolet pump IR-probe photoionization protocol that employs pairs of counterrotating consecutive harmonics and angularly resolved photoelectron detection, thereby providing a direct measurement of ioniz…
View article: Polarization tagging of two-photon double ionization by elliptically polarized XUV pulses
Polarization tagging of two-photon double ionization by elliptically polarized XUV pulses Open
We explore the influence of elliptical polarization on the (non)sequential two-photon double ionization of atomic helium with ultrashort extreme ultraviolet (XUV) light fields using time-dependent full ab initio simulations. The energy and…
View article: Real-Time Reconstruction of the Strong-Field-Driven Dipole Response
Real-Time Reconstruction of the Strong-Field-Driven Dipole Response Open
The reconstruction of the full temporal dipole response of a strongly driven time-dependent system from a single absorption spectrum is demonstrated, only requiring that a sufficiently short pulse is employed to initialize the coherent exc…
View article: Watching the emergence of a Fano resonance in doubly excited helium
Watching the emergence of a Fano resonance in doubly excited helium Open
We report on the experimental observation of the buildup of the 2s2p Fano resonance in helium in the time domain, which has been under theoretical investigation for more than a decade. The emergence of the absorption line is temporally res…
View article: Long-time expansion of a Bose-Einstein condensate: Observability of Anderson localization
Long-time expansion of a Bose-Einstein condensate: Observability of Anderson localization Open
We numerically explore the long-time expansion of a one-dimensional Bose-Einstein condensate in a disorder potential employing the Gross-Pitaevskii equation. The goal is to search for unique signatures of Anderson localization in the prese…