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arXiv · 2611.08899

Spiral momentum spectra and spin asymmetry in vacuum pair production driven by phase-modulated elliptically polarized electric fields

Li-Yi Yang·Hong-Hao Fan·Jing-He Huang·Shuo Yang·Bai-Song Xie
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Abstract

We study vacuum electron--positron pair production in phase-modulated elliptically polarized electric fields using the quantum kinetic equations. We analyze how the modulation amplitude, frequency, ellipticity, and modulation form affect the spin-resolved momentum spectra and the spin asymmetry. Cosine-type modulation can deform ring-shaped momentum distributions into spiral patterns. This deformation depends nonmonotonically on the modulation amplitude and frequency and is most pronounced for circular polarization. In the transverse momentum plane, the spin-resolved yields favor the spin channel along the direction of field handedness. Reversing the field handedness would reverse the favored channel while leaving the total yield unchanged. Sine-type modulation preserves ring-shaped and mirror-symmetric spectra approximately, however, it leads to a stronger dependence of the spin asymmetry on the modulation amplitude than cosine-type modulation does. These results show that phase modulation and ellipticity can control the momentum spectra patterns in vacuum pair production. Moreover, phase modulation can also affect the degree of spin asymmetry.

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Li-Yi Yang, Hong-Hao Fan, Jing-He Huang, Shuo Yang, Bai-Song Xie. 2026-11-06. Spiral momentum spectra and spin asymmetry in vacuum pair production driven by phase-modulated elliptically polarized electric fields. https://arxiv.org/abs/2611.08899

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