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Chin. Phys. B, 2026, Vol. 35(4): 044204    DOI: 10.1088/1674-1056/ae04da
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Role of trajectory symmetry in solid high-order harmonic generation

Shuang Wang(王爽)1, Yu Zhao(赵宇)1, Hui-Rong Wang(王慧荣)1, Yun-He Xing(邢云鹤)1, Xiao-Xin Huo(霍晓鑫)2, and Jun Zhang(张军)1,†
1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 School of Science, Shenyang Ligong University, Shenyang 110159, China
Abstract  High-order harmonic generation (HHG) from a ZnO crystal has been investigated theoretically using a two-band model driven by a few-cycle laser pulse. We observe that harmonics in the cut-off region exhibit periodic frequency shifts with changes in the carrier envelope phase (CEP) of the laser field. When the CEP of the laser pulse is an integer multiple of $\pi$, the cut-off region is dominated by even-order harmonics rather than odd-order harmonics. To illustrate the physical mechanism behind the even-order harmonics, we track the trajectories of electrons and holes between two successive half-cycles by performing time-frequency analysis and applying the recollision model. The results show that the maximum electron displacement is symmetric between successive half-cycles for odd-order harmonics. In contrast, the half-cycle symmetry of the maximum displacement is broken in the case of even-order harmonics.
Keywords:  high-order harmonic generation      recollision model      trajectory analyses  
Received:  30 August 2025      Revised:  30 August 2025      Accepted manuscript online:  09 September 2025
PACS:  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
  32.80.Rm (Multiphoton ionization and excitation to highly excited states)  
  42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)  
Fund: This work was supported by the Natural Science Foundation of Jilin Province of China (Grant No. 20230101014JC) and the National Natural Science Foundation of China (Grant No. 12374265).
Corresponding Authors:  Jun Zhang     E-mail:  junzhang@jlu.edu.cn

Cite this article: 

Shuang Wang(王爽), Yu Zhao(赵宇), Hui-Rong Wang(王慧荣), Yun-He Xing(邢云鹤), Xiao-Xin Huo(霍晓鑫), and Jun Zhang(张军) Role of trajectory symmetry in solid high-order harmonic generation 2026 Chin. Phys. B 35 044204

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