4.6 Article

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

期刊

FRONTIERS OF PHYSICS
卷 16, 期 5, 页码 -

出版社

HIGHER EDUCATION PRESS
DOI: 10.1007/s11467-021-1084-7

关键词

helicity-dependent time delay; TCCP; multiphoton ionization

资金

  1. National Key Research and Development Program of China [2019YFA0308300]
  2. National Natural Science Foundation of China [11874163, 12021004]

向作者/读者索取更多资源

The study investigates the multiphoton ionization of hydrogen atom in two-color circularly polarized laser fields, revealing distinct structures and intensities of sideband peaks under specific conditions, which can be explained by the selection rules of photon-absorption channels.
By numerically solving the three-dimensional time-dependent Schrodinger 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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