221 citations · 969 across the 35 of their papers we have counts for
25 papers · 1 filter
Time delay in nonadiabatic tunneling ionization
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
The under-the-barrier recollision pathway during the tunneling ionization of an atom, despite its minuscule amplitude, leaves its signature on the observable photoelectron momentum…
Role of quantum dynamics in coherent and incoherent radiation during tunneling ionization
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
Radiation during strong-field tunneling ionization is investigated. The spontaneous as well as the coherent components of the radiation are calculated describing the ionization dyn…
Low-energy photoelectron structures for arbitrary ellipticity of a strong laser field
Q. Z. Lv, M. Klaiber, P. -L. He +2
Previous attoclock experiments measuring the photoelectron momentum distribution (PMD) via strong-field ionization in an elliptically polarized laser field have shown anomalously l…
Atomic polarization and Stark-shift in relativistic strong field ionization
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
A relativistic analytical theory of strong field ionization applicable across the regimes of the deep-tunneling up to the over-barrier ionization (OTBI) is developed, incorporating…
Relativistic analytical R-matrix (ARM) theory for strong-field ionization
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
The analytical R-matrix (ARM) theory has been known for an efficient description of the Coulomb effects of the atomic core in strong-field ionization in the nonrelativistic regime.…
Sub-cycle time-resolved nondipole dynamics in tunneling ionization
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
The electron nondipole dynamics in tunneling ionization in an elliptically polarized laser field is investigated theoretically using a relativistic Coulomb-corrected strong-field a…
Tunneling ionization in ultrashort laser pulses: edge-effect and remedy
M. Klaiber, Q. Z. Lv, K. Z. Hatsagortsyan +1
Tunneling ionization of an atom in ultrashort laser pulses is considered. When the driving laser pulse is switched-on and -off with a steep slope, the photoelectron momentum distri…
Nondipole Coulomb sub-barrier ionization dynamics and photon momentum sharing
Pei-Lun He, Michael Klaiber, Karen Z. Hatsagortsyan +1
The nondipole under-the-barrier dynamics of the electron during strong-field tunneling ionization is investigated, examining the role of the Coulomb field of the atomic core. The c…
The role of reflections in the generation of a time delay in strong field ionization
Daniel Bakucz Canário, Michael Klaiber, Karen Z. Hatsagortsyan +1
The problem of time delay in tunneling ionization is revisited. The origin of time delay at the tunnel exit is analysed, underlining the two faces of the concept of the tunnelling…
Sub-barrier pathways to Freeman resonances
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
The problem of Freeman resonances [R. R. Freeman \textit{et al.}, Phys. Rev. Lett. \textbf{59}, 1092 (1987)] when strong field ionization is enhanced due to the transient populatio…
Origin of high energy enhancement of photoelectron spectra in tunneling ionization
Pei-Lun He, Michael Klaiber, Karen Z. Hatsagortsyan +1
Recently, in a strong Coulomb field regime of tunneling ionization an unexpected large enhancement of photoelectron spectra due to the Coulomb field of the atomic core has been ide…
Under-the-tunneling-barrier recollisions in strong field ionization
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
A new pathway of strong laser field induced ionization of an atom is identified which is based on recollisions under the tunneling barrier. With an amended strong field approximati…
Interplay between Coulomb-focusing and non-dipole effects in strong-field ionization with elliptical polarization
J. Maurer, B. Willenberg, B. W. Mayer +7
Strong-field ionization and rescattering beyond the long-wavelength limit of the dipole approximation is studied with elliptically polarized mid-IR pulses. We have measured the ful…
Experimental evidence for Wigner's tunneling time
Nicolas Camus, Enderalp Yakaboylu, Lutz Fechner +7
Tunneling of a particle through a potential barrier remains one of the most remarkable quantum phenomena. Owing to advances in laser technology, electric fields comparable to those…
The cross-over from tunnelling to multiphoton ionization of atoms
Michael Klaiber, John S Briggs
We present a theory illuminating the cross-over from strong-field tunnelling ionization to weak-field multiphoton ionization in the interaction of a classical laser field with a hy…
Laser-driven relativistic tunneling from p-states
Michael Klaiber, Karen Z. Hatsagortsyan
The tunneling ionization of an electron from a p-state in a highly charged ion in the relativistic regime is investigated in a linearly polarized strong laser field. In contrast to…
Spin effects in relativistic ionization with highly charged ions in super-strong laser fields
Michael Klaiber, Enderalp Yakaboylu, Carsten Müller +3
Spin effects in above-threshold ionization of hydrogenlike highly charged ions in super-strong laser fields are investigated. Spin-resolved ionization rates in the tunneling regime…
Above-threshold ionization with highly-charged ions in super-strong laser fields: II. Relativistic Coulomb-corrected strong field approximation
Michael Klaiber, Enderalp Yakaboylu, Karen Z. Hatsagortsyan
We develop a relativistic Coulomb-corrected strong field approximation (SFA) for the investigation of spin effects at above-threshold ionization in relativistically strong laser fi…
Above-threshold ionization with highly-charged ions in super-strong laser fields: I. Coulomb-corrected strong field approximation
Michael Klaiber, Enderalp Yakaboylu, Karen Z. Hatsagortsyan
Aiming at the investigation of above-threshold ionization in super-strong laser fields with highly charged ions, we develop a Coulomb-corrected strong field approximation (SFA). Th…
Under-the-barrier dynamics in laser-induced relativistic tunneling
Michael Klaiber, Enderalp Yakaboylu, Heiko Bauke +2
The tunneling dynamics in relativistic strong-field ionization is investigated with the aim to develop an intuitive picture for the relativistic tunneling regime. We demonstrate th…
Phase-matched coherent hard x-rays from relativistic high-order harmonic generation
Markus C. Kohler, Michael Klaiber, Karen Z. Hatsagortsyan +1
High-order harmonic generation (HHG) with relativistically strong laser pulses is considered employing electron ionization-recollisions from multiply charged ions in counterpropaga…
Coherent hard x-rays from attosecond pulse train-assisted harmonic generation
Michael Klaiber, Karen Z. Hatsagortsyan, Carsten Müller +1
High-order harmonic generation from atomic systems is considered in the crossed fields of a relativistically strong infrared laser and a weak attosecond-pulse train of soft x-rays.…
Zeptosecond -ray pulses
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
High-order harmonic generation (HHG) in the relativistic regime is employed to obtain zeptosecond pulses of -rays. The harmonics are generated from atomic systems in counterprop…
Relativistic ionization-rescattering with tailored laser pulses
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
The interaction of relativistically strong tailored laser pulses with an atomic system is considered. Due to a special tailoring of the laser pulse, the suppression of the relativi…