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Helicity-dependent time delays in multiphoton ionization by two-color circularly polarized laser fields

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Abstract

By numerically solving the three-dimensional time-dependent Schrödinger equation, we have investigated multiphoton ionization of hydrogen atom in the two-color circularly polarized (TCCP) laser fields consisting of a strong 400 nm and a much weaker 800 nm pulses. Due to the presence of perturbative 800 nm laser pulse, sideband peaks emerge between the above-threshold ionization rings in the photoelectron momentum distributions. Our numerical results show that the sideband peaks exhibit one-lobe structure in the co-rotating TCCP laser fields, while it displays the three-lobe structure in the counter-rotating TCCP laser fields. Moreover, the photoelectron yield of sidebands in the co-rotating TCCP fields is much higher than those of the counter-rotating TCCP fields. These phenomena could be well explained from the perspective of the photon-absorption channels via the selection rules. Interestingly, an obvious phase shift between the sidebands of different orders from the co-rotating and counter-rotating TCCP fields is observed. This shift indicates the helicity-dependent time delay in the one-photon continuum-continuum transition process.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grants No. 2019YFA0308300) and the National Natural Science Foundation of China (Grant Nos. 11874163 and 12021004).

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Authors and Affiliations

  1. School of Physics and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Qing-Hua Ke, Yue-Ming Zhou, Yi-Jie Liao, Jin-Tai Liang, Yong Zhao, Jia Tan, Min Li & Pei-Xiang Lu

  2. Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan, 430205, China

    Pei-Xiang Lu

  3. CAS Center for Excellence in Ultra-intense Laser Science, Shanghai, 201800, China

    Pei-Xiang Lu

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  1. Qing-Hua Ke
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  2. Yue-Ming Zhou
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  4. Jin-Tai Liang
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Correspondence to Yue-Ming Zhou or Pei-Xiang Lu.

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arXiv: 2105.10151. This article can also be found at http://journal.hep.com.cn/fop/EN/10.1007/s11467-021-1084-7.

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Ke, QH., Zhou, YM., Liao, YJ. et al. Helicity-dependent time delays in multiphoton ionization by two-color circularly polarized laser fields. Front. Phys. 16, 52503 (2021). https://doi.org/10.1007/s11467-021-1084-7

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