Modifying the electron dynamics in high-order harmonic generation via two-color laser field

Abstract

Abstract The harmonic emission from bichromatic periodic potential has been investigated by numerically solving the time-dependent Schrödinger equation in velocity gauge. The results show that the harmonic minimum is sensitive to the wavelength. Moreover, distinct crystal momentum states contribute differently to harmonic generation. In momentum space, the electron dynamics reveals a close relationship between the spectral minimum and the electron distribution in higher conduction bands. Additionally, by introducing an ultraviolet pulse to the fundamental laser field, the suppression of harmonic minimum occurs as a result of heightened electron populations in higher conduction bands. This work can shed light on the harmonic emission originating from solid with a two-atom basis.