High-order harmonic generation of ZnO crystals in chirped and static electric fields  

作　　者：张玲玉 何永林 谢卓璇 高芳艳 徐清芸 葛鑫磊 罗香怡 郭静 Ling-Yu Zhang;Yong-Lin He;Zhuo-Xuan Xie;Fang-Yan Gao;Qing-Yun Xu;Xin-Lei Ge;Xiang-Yi Luo;Jing Guo(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;School of Physics and Electromechanical Engineering,Hexi University,Zhangye 734000,China;Institute of Theoretical Physics,Hexi University,Zhangye 734000,China;College of Physical Science and Technology,Bohai University,Jinzhou 121013,China;College of Physics and Electronic Information,Baicheng Normal University,Baicheng 137000,China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China [2]School of Physics and Electromechanical Engineering,Hexi University,Zhangye 734000,China [3]Institute of Theoretical Physics,Hexi University,Zhangye 734000,China [4]College of Physical Science and Technology,Bohai University,Jinzhou 121013,China [5]College of Physics and Electronic Information,Baicheng Normal University,Baicheng 137000,China

出　　处：《Chinese Physics B》2024年第1期335-343,共9页中国物理B（英文版）

基　　金：supported by the Natural Science Foundation of Jilin Province (Grant No.20220101010JC);the National Natural Science Foundation of China (Grant No.12074146)。

摘　　要：High harmonic generation in ZnO crystals under chirped single-color field and static electric field are investigated by solving the semiconductor Bloch equation(SBE). It is found that when the chirp pulse is introduced, the interference structure becomes obvious while the harmonic cutoff is not extended. Furthermore, the harmonic efficiency is improved when the static electric field is included. These phenomena are demonstrated by the classical recollision model in real space affected by the waveform of laser field and inversion symmetry. Specifically, the electron motion in k-space shows that the change of waveform and the destruction of the symmetry of the laser field lead to the incomplete X-structure of the crystal-momentum-resolved(k-resolved) inter-band harmonic spectrum. Furthermore, a pre-acceleration process in the solid four-step model is confirmed.

关 键 词：high-order harmonic generation the semiconductor Bloch equation k-resolved inter-band harmonic spectrum four-step semiclassical model 

分 类 号：O73[理学—晶体学] O441.1