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

被引:0
作者
Zhang, Ling-Yu [1 ]
He, Yong-Lin [2 ,3 ]
Xie, Zhuo-Xuan [1 ]
Gao, Fang-Yan [1 ]
Xu, Qing-Yun [1 ]
Ge, Xin-Lei [4 ]
Luo, Xiang-Yi [5 ]
Guo, Jing [1 ]
机构
[1] Jilin Univ, Inst Atom & Mol Phys, Changchun 130012, Peoples R China
[2] Hexi Univ, Sch Phys & Electromech Engn, Zhangye 734000, Peoples R China
[3] Hexi Univ, Inst Theoret Phys, Zhangye 734000, Peoples R China
[4] Bohai Univ, Coll Phys Sci & Technol, Jinzhou 121013, Peoples R China
[5] Baicheng Normal Univ, Coll Phys & Elect Informat, Baicheng 137000, Peoples R China
基金
中国国家自然科学基金;
关键词
high-order harmonic generation; the semiconductor Bloch equation; k-resolved inter-band harmonic spectrum; four-step semiclassical model; PULSE; LASER;
D O I
10.1088/1674-1056/acfa89
中图分类号
O4 [物理学];
学科分类号
0702 ;
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.
引用
收藏
页数:9
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