Theoretical study of laser parameter-dependent properties of high-order harmonic generation in solids based on different physical mechanisms

doi:10.3969/j.issn.1000-5641.2024.03.011

Abstract

Abstract:

In the study of high-order harmonic generation mechanisms, the main focus has been on interband polarization and intraband currents, as well as anomalous current mechanisms caused by Berry curvature. The long-neglected mixture term currents have been obtained by decomposing the strong laser-induced intact currents into contributions from different mechanisms. In this study, the peak amplitude and laser wavelength dependence of the high harmonics generated by different mechanisms were investigated by numerically solving the semiconductor Bloch equations (SBE). The interference between the current mechanisms was explored. It was found that the high-order harmonic spectra induced by the mixture term currents and the interband polarization currents have extremely similar variation patterns and extremely close harmonic intensities, both with the change in wavelength and the change in peak amplitude. Additionally, the anomalous harmonics were found to produce only even harmonics perpendicular to the polarization direction of the laser field. The anomalous harmonics are unique in that they have a minimum during wavelength and peak intensity variations. Analyzing the interference effects between the different mechanisms revealed that the interband polarization harmonics and intraband harmonics (including anomalous harmonics) interfere significantly with each other in the vertical polarization direction, while the interference of mixture term harmonics with intraband harmonics is negligible.

Key words: high-order harmonic generation, Berry curvature, laser-induced current, quantum interference

CLC Number:

O437

Xiance XIE, Zijian HU, Zhihong YANG, Yunhui WANG, Shicheng JIANG. Theoretical study of laser parameter-dependent properties of high-order harmonic generation in solids based on different physical mechanisms[J]. Journal of East China Normal University(Natural Science), 2024, 2024(3): 101-112.

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