# Semiclassical two-step model with quantum input: Quantum-classical approach to strong-field ionization

## TL;DR

This paper introduces a semiclassical two-step model with quantum input for strong-field ionization, accurately capturing electron dynamics by integrating quantum initial conditions with classical trajectories, improving upon traditional methods.

## Contribution

The model combines quantum initial conditions with classical trajectories, providing a more accurate semiclassical approach to strong-field ionization than standard methods.

## Key findings

- Quantitative agreement with quantum results for 1D atom ionization.
- Accurate reproduction of photoelectron momentum distribution.
- Successful modeling of interference structures.

## Abstract

We present a mixed quantum-classical approach to strong-field ionization - a semiclassical two-step model with quantum input. In this model the initial conditions for classical trajectories that simulate electron wave packet after ionization are determined by the exact quantum dynamics. As a result, the model allows to overcome deficiencies of standard semiclassical approaches in describing the ionization step. The comparison with the exact numerical solution of the time-dependent Schr\"{o}dinger equation shows that for ionization of a one-dimensional atom the model yields quantitative agreement with the quantum result. This applies both to the width of the photoelectron momentum distribution and the interference structure.