Abstract
In the single-active-electron model, we numerically solve the time-dependent Schrödinger equation to investigate the high-order harmonic generation (HHG) from solids. The results demonstrate that the intensity of the second plateau of the HHG with the initial multiphoton ionization channel is higher than that with the tunneling ionization channel, the cutoff energy of the harmonics with the initial multiphoton ionization channel is extended. We present a detailed analysis of the motion path of the electrons with the initial multiphoton ionization channel in the energy band structure, the results show that the electrons can be pumped directly to the conduction band at the multiphoton ionization channel. The time-dependent population imaging (TDPI) picture is used to further illustrate the excitation process of the electron, which is in agreement with the characteristics of the motion path of the electrons in the energy band structure.
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