Low-energy photoelectron structures for arbitrary ellipticity of a strong laser field
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915110389284864 |
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| author | Lv, Q. Z. Klaiber, M. He, P. -L. Hatsagortsyan, K. Z. Keitel, C. H. |
| author_facet | Lv, Q. Z. Klaiber, M. He, P. -L. Hatsagortsyan, K. Z. Keitel, C. H. |
| contents | Previous attoclock experiments measuring the photoelectron momentum distribution (PMD) via strong-field ionization in an elliptically polarized laser field have shown anomalously large offset angles in the nonadiabatic regime with large Keldysh parameters ($γ$). We investigate the process theoretically in the complete range of ellipticity ($ε$) and large range of $γ$, employing numerical solutions of time-dependent Schrödinger equation and nonadiabatic classical-trajectory Monte Carlo simulations matched with the under-the-barrier motion via the nonadiabatic strong field approximation. We show the formation of low-energy structures (LES) at any ellipticity value when the Keldysh parameter is sufficiently large. Three regimes of the interaction in the ($ε$-$γ$)-space of parameters are identified via the characteristic PMD features. The significant modification of the recollision picture in the nonadiabatic regime, with so-called anomalous and hybrid slow recollisions, is shown to be behind the LES, inducing extreme nonlinear Coulomb bunching in the phase-space in the polarization plane. Our findings elucidate subtle features of the attosecond electron dynamics in strong-field ionization at extreme conditions and indicate limitations on attosecond imaging. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_11144 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Low-energy photoelectron structures for arbitrary ellipticity of a strong laser field Lv, Q. Z. Klaiber, M. He, P. -L. Hatsagortsyan, K. Z. Keitel, C. H. Atomic Physics Quantum Physics Previous attoclock experiments measuring the photoelectron momentum distribution (PMD) via strong-field ionization in an elliptically polarized laser field have shown anomalously large offset angles in the nonadiabatic regime with large Keldysh parameters ($γ$). We investigate the process theoretically in the complete range of ellipticity ($ε$) and large range of $γ$, employing numerical solutions of time-dependent Schrödinger equation and nonadiabatic classical-trajectory Monte Carlo simulations matched with the under-the-barrier motion via the nonadiabatic strong field approximation. We show the formation of low-energy structures (LES) at any ellipticity value when the Keldysh parameter is sufficiently large. Three regimes of the interaction in the ($ε$-$γ$)-space of parameters are identified via the characteristic PMD features. The significant modification of the recollision picture in the nonadiabatic regime, with so-called anomalous and hybrid slow recollisions, is shown to be behind the LES, inducing extreme nonlinear Coulomb bunching in the phase-space in the polarization plane. Our findings elucidate subtle features of the attosecond electron dynamics in strong-field ionization at extreme conditions and indicate limitations on attosecond imaging. |
| title | Low-energy photoelectron structures for arbitrary ellipticity of a strong laser field |
| topic | Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2501.11144 |