摘要
We investigate the crystal-momentum-resolved contributions to high-order harmonic generation in laser-driven graphene by semi-conductor Bloch equations in the velocity gauge.It is shown that each harmonic is generated by electrons with the specific initial crystal momentum.The higher harmonics are primarily contributed by the electrons of larger initial crystal momentum because they possess larger instantaneous energies during the intraband motion.Particularly,we observe circular interference fringes in the crystal-momentum-resolved harmonics spectrum,which result from the inter-cycle interference of harmonic generation.These circular fringes will disappear if the inter-cycle interference is disrupted by the strong dephasing effect.Our findings can help to better analyze the mechanism of high harmonics in graphene.
作者
彭朝阳
郎跃
朱雅蕾
赵晶
张栋文
赵增秀
袁建民
Zhaoyang Peng;Yue Lang;Yalei Zhu;Jing Zhao;Dongwen Zhang;Zengxiu Zhao;Jianmin Yuan(Department of Physics,National University of Defense Technology,Changsha 410073,China;Department of Physics,Graduate School of China Academy of Engineering Physics,Beijing 100193,China)
基金
the National Key R&D Program of China(Grant No.2019YFA0307703)
the National Natural Science Foundation of China(Grant Nos.12234020 and 12274384)
the Major Research Plan of the National Natural Science Foundation of China(Grant No.91850201)。
