Time-dependent Hartree-Fock study of electron-hole interaction effects on high-harmonic generation from periodic crystals

TL;DR

This study uses time-dependent Hartree-Fock theory to explore how electron-hole interactions influence high-harmonic generation in crystals, revealing significant spectral changes and the role of Coulomb-driven interband polarization.

Contribution

It demonstrates the impact of electron-hole interactions on harmonic spectra, highlighting the importance of multielectron effects in solid-state HHG modeling.

Findings

Multiple-plateau formation at lower intensities

Interband polarization enables remote interband excitation

Qualitative spectral changes due to electron-hole interactions

Abstract

We investigate the multielectron effects on high-harmonic generation from solid-state materials using the time-dependent Hartree-Fock theory. We find qualitative change in harmonic spectra, in particular, multiple-plateau formation at significantly lower laser intensities than within the independent-electron approximation. We reveal its origin in terms of interband polarization, i.e, electron-hole polarization, enabling interband excitation at remote crystal momenta via Coulomb potential.