Spin - resolved momentum distributions and vortex evolution in multiphoton pair production within a modified two-level model
Abstract
We investigate spin-resolved momentum distributions and phase vortices in multiphoton electron-positron pair production within a modified two-level model. This model retains the diagonal spinor inner-product terms neglected in the adiabatic approximation, thereby inducing spin-resolved transverse asymmetries in the momentum distribution. For a circularly polarized pulse, the handedness determines the winding direction of the quantized vortices, whereas for a linearly polarized pulse, the phase distribution exhibits nodal lines rather than quantized vortices. For two time-delayed circularly polarized pulses, the time delay introduces a relative phase that governs the multiphoton interference, which in turn drives the vortex evolution in each spin configuration. These results demonstrate that pulse polarization and time delay enable coherent control over vortex topology in pair production.
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BibTeX
@misc{wang2026spin,
title = {{Spin - resolved momentum distributions and vortex evolution in multiphoton pair production within a modified two-level model}},
author = {Qi-Rong Wang and Hong-Hao Fan and Musajan Kadir and Ying Wu and Bai-Song Xie},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29334},
eprint = {2610.29334},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29334},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Spin - resolved momentum distributions and vortex evolution in multiphoton pair production within a modified two-level model
AU - Qi-Rong Wang
AU - Hong-Hao Fan
AU - Musajan Kadir
AU - Ying Wu
AU - Bai-Song Xie
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29334
UR - https://arxiv.org/abs/2610.29334
AB - We investigate spin-resolved momentum distributions and phase vortices in multiphoton electron-positron pair production within a modified two-level model. This model retains the diagonal spinor inner-product terms neglected in the adiabatic approximation, thereby inducing spin-resolved transverse asymmetries in the momentum distribution. For a circularly polarized pulse, the handedness determines the winding direction of the quantized vortices, whereas for a linearly polarized pulse, the phase distribution exhibits nodal lines rather than quantized vortices. For two time-delayed circularly polarized pulses, the time delay introduces a relative phase that governs the multiphoton interference, which in turn drives the vortex evolution in each spin configuration. These results demonstrate that pulse polarization and time delay enable coherent control over vortex topology in pair production.
ER -