Bohmian mechanics to high-order harmonic generation

TL;DR

This paper applies Bohmian mechanics to analyze high-order harmonic generation in intense laser-atom interactions, revealing how electron trajectories influence the regularity of the power spectrum and aligning with quantum mechanical results.

Contribution

It introduces Bohmian mechanics into high-order harmonic generation studies, providing a trajectory-based perspective that explains spectral irregularities and their transition to regularity.

Findings

Bohmian trajectories produce irregular power spectra.

Ensemble averaging yields spectra consistent with quantum mechanics.

Irregular spectra are explained by trajectory dynamics.

Abstract

This paper introduces Bohmian mechanics (BM) into the intense laser-atom physics to study high-order harmonic generation. In BM, the trajectories of atomic electrons in intense laser field can be obtained with the Bohm-Newton equation. The power spectrum with the trajectory of an atomic electron is calculated, which is found to be irregular. Next, the power spectrum associated with an atom ensemble from BM is considered, where the power spectrum becomes regular and consistent with that from quantum mechanics. Finally, the reason of the generation of the irregular spectrum is discussed.