Improved one-dimensional model potentials for strong-field simulations

TL;DR

This paper introduces a new one-dimensional atomic model potential based on ground state density requirements, improving the accuracy of strong-field simulation results, especially for low-frequency features and high-order harmonic spectra.

Contribution

A novel 1D atomic model potential derived from ground state density considerations that enhances simulation accuracy in strong-field physics.

Findings

Increased accuracy of low-frequency physical quantities.

High-order harmonic spectra closely match 3D simulation results.

Model potentials can be scaled to fit 3D spectral data.

Abstract

Based on a plausible requirement for the ground state density, we introduce a novel one-dimensional (1D) atomic model potential for the 1D simulation of the quantum dynamics of a single active electron atom driven by a strong, linearly polarized few-cycle laser pulse. The form of this density-based 1D model potential also suggests improved parameters for other well-known 1D model potentials. We test these 1D model potentials in numerical simulations of typical strong-field physics scenarios and we find an impressively increased accuracy of the low-frequency features of the most important physical quantities. The structure and the phase of the high-order harmonic spectra also have a very good match to those resulting from the three-dimensional simulations, which enables to fit the corresponding power spectra with the help of a simple scaling function.