Coulomb-Corrected Strong Field Approximation without Singularities and Branch Points
arXiv:1807.08285 · doi:10.1088/1742-6596/1206/1/012004
Abstract
The domain of validity of the Coulomb-Corrected Strong Field Approximation (CCSFA) is going to be analyzed in relation to the semi-classical dynamics of electrons during ionization of hydrogen-like targets. Our analysis is limited to ionization driven by Ti-sapphire laser pulses with intensities up to roughly 10 Wcm. For such parameters, the effects related to radiation pressure are small and the laser field can be described in the dipole approximation. By applying the Magnus expansion for the exact retarded electron propagator we obtain an {\it effective action} which is free of Coulomb singularities and branch points when the complex-time trajectories are used. Furthermore, we show that the classical action is exactly recovered as the asymptotic limit of its effective counterpart. The applicability of such limit is also discussed.
arXiv comment12 pages, 2 figures; lecture delivered at the 27th International Laser Physics Workshop, Nottingham, UK, July 16-20, 2018
References in corpus (14)
- Extremely high-intensity laser interactions with fundamental quantum systems
- The Magnus expansion and some of its applications
- Floquet-Magnus Theory and Generic Transient Dynamics in Periodically Driven Many-Body Quantum Systems
- Partitioning of the linear photon momentum in multiphoton ionization
- Recollisions and correlated double ionization with circularly polarized light
- Strong Field Ionization Rate for Arbitrary Laser Frequencies
- Coulomb-corrected quantum interference in above-threshold ionization: Working towards multi-trajectory electron holography
- Slalom in complex time: emergence of low-energy structures in tunnel ionization via complex time contours
- Effects of the Coulomb potential in interference patterns of strong-field holography with photoelectrons
- Fourth order real space solver for the time-dependent Schrödinger equation with singular Coulomb potential
- On the completeness and orthonormality of the Volkov states and the Volkov propagator in configuration space
- Generation of electron vortex states in ionization by intense and short laser pulses
- Generalized eikonal approximation for strong-field ionization
- Origin of high energy enhancement of photoelectron spectra in tunneling ionization