Electron vortex generations in photoionization of hydrogen atoms by circularly-polarized chirped attosecond pulses  

作　　者：Bingshuang Zhang Xiaoyu Liu Fengzheng Zhu Liguang Jiao Aihua Liu 

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China [2]School of Mathematics and Physics,Hubei Polytechnic University,Huangshi 435003,China [3]College of Physics,Jilin University,Changchun 130012,China [4]Helmholtz-Institut Jena,D-07743 Jena,Germany [5]State Key Laboratory of Transient Optics and Photonics,Chinese Academy of Sciences,Xi'an 710119,China

出　　处：《Communications in Theoretical Physics》2024年第1期111-118,共8页理论物理通讯（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFE0134200);the National Natural Science Foundation of China(Grant Nos.12174147,91850114,11774131);the Natural Science Foundation of Jilin Province,China(Grant No.20220101016JC);the Open Research Fund of State Key Laboratory of Transient Optics and Photonics。

摘　　要：By numerically solving the time-dependent Schr?dinger equation and employing the analytical perturbative model,we investigated the chirp-induced electron vortex in the photoionization of hydrogen atoms by a pair of counter-rotating circularly polarized chirped attosecond extremely ultraviolet pulses.We demonstrated that single-photon ionization of hydrogen atoms generates photoelectron momentum distributions(PMDs)with distinct helical vortex structures either with or without a time delay between two counter-rotating circularly polarized laser pulses.These structures are highly sensitive to both the time delay between the pulses and their chirp parameters.Our analytical model reveals that the splitting of vortex spirals is caused by the sign changing of the chirp-induced frequency-dependent time delay.We showed that to obtain the counterpart of the PMD under a pair of counter-rotating circularly polarized chirped pulses,both chirp parameters and ordering of pulses need to be reversed.

关 键 词：PHOTOIONIZATION ultrafast processes ultrafast dynamics electron vortex 

分 类 号：O562[理学—原子与分子物理]