Ionization dynamics and gauge invariance

0566297 - FZÚ 2023 RIV US eng J - Journal Article
Vábek, Jan - Bachau, H. - Catoire, F.
Ionization dynamics and gauge invariance.
Physical Review A. Roč. 106, č. 5 (2022), č. článku 053115. ISSN 2469-9926. E-ISSN 2469-9934
R&D Projects: GA MŠMT(CZ) LM2018141; GA MŠMT EF16_019/0000789; GA ČR(CZ) GC20-24805J
Grant - others:OP VVV - ADONIS(XE) CZ.02.1.01/0.0/0.0/16_019/0000789
Institutional support: RVO:68378271
Keywords : gauge invariance * ultrafast phenomena
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.9, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevA.106.053115

Photoionization is one of the most fundamental processes in laser-matter interaction. It plays a crucial role also from the practical point of view since the electron-density dynamics in a gaseous medium is a process that affects the field propagation. Photoionization has been addressed in different regimes: linear, multiphoton, and tunneling. The ideal tool that allows for the description of ionization, in all aforementioned regimes, is the numerical evaluation of the time-dependent Schrödinger equation. The determination of the electron density needs the computation of the time-dependent ionization probability which unfortunately is an ambiguous quantity due to the gauge dependence of the latter. In this paper, we show how to overcome this difficulty by properly defining the time-dependent ionization probability in the context of the resolvent operator method.
Permanent Link: https://hdl.handle.net/11104/0337672