We investigate the harmonic emission from bichromatic periodic potential by numerically solving the timedependent Schro¨dinger equation in the velocity gauge. The results show that the harmonic minimum is sensiti...We investigate the harmonic emission from bichromatic periodic potential by numerically solving the timedependent Schro¨dinger equation in the 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 reveal 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 the harmonic minimum occurs as a result of heightened electron populations in higher conduction bands. This work sheds light on the harmonic emission originating from a solid with a two-atom basis.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 11974229, 12204291, and 11404204)the Scientific and Technological Innovation Program of Higher Education Institutions in Shanxi, China (Grant No. 2021L255)。
文摘We investigate the harmonic emission from bichromatic periodic potential by numerically solving the timedependent Schro¨dinger equation in the 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 reveal 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 the harmonic minimum occurs as a result of heightened electron populations in higher conduction bands. This work sheds light on the harmonic emission originating from a solid with a two-atom basis.
