[5p-S45-1~17] 3.6 Ultrashort-pulse and high-intensity lasers

[5p-S45-3] The effect of electron-hole interaction on high-harmonic generation from solid-state materials

〇Takuya Ikemachi¹, Yasushi Shinohara², Takeshi Sato², Junji Yumoto¹, Makoto Gonokami¹, Kenichi Ishikawa² (1.Univ. Tokyo, School of Science, 2.Univ. Tokyo, School of Engineering)

Keywords:high-harmonic generation from solids, strong-field physics

Solid-state materials have recently emerged as a new stage for strong-field physics. In particular, since the first observation in 2011, many experimental observation of high-harmonic generation (HHG) from solids has been reported, which have accelerated the discussion on the underlying mechanism of the phenomena. In our recent work, based on the numerical simulation results within the independent electron approximation, we showed that one can deduce features of solid HHG by tracing electron semiclassical dynamics in momentum space, analogously to the familiar gas-phase three-step model. Therefore, this offers a unified basis to understand HHG from gas-phase and solid-state materials. Electron-hole interaction, from the point of view of material science, plays an important role in solid material properties as well as their excitation process. It is very interesting to investigate the many-body interaction effects on electron dynamics driven by intense field, which may give us an insight on the similarity and difference of gas-phase and solid-state HHG. Aiming for revealing the electron-hole interaction effects on the electron dynamics driven by an intense laser field and the resulted HHG spectra, we solved time-dependent Hartree-Fock (TDHF) theory numerically for one-dimensional model crystal. In the presentation, we will show the TDHF simulation results, comparing it with that from independent electron theory, and will discuss the electron-hole interaction effects on the electron dynamics.