Semiclassical analysis of photoelectron interference in a synthesized two-color laser pulse

Feng, Yudi; Li, Min; Luo, Siqiang; Liu, Kun; Bao-jie, DU; Zhou, Yueming; Lu, Peixiang

doi:10.1103/physreva.100.063411

Cited by 29 publications

(16 citation statements)

References 46 publications

(54 reference statements)

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“…The first step to access the Wigner time delay in strong field ionization within the framework of HASE is to conduct an experiment using a CoRTC field. High ratios of E 390 /E 780 decrease the visibility of the sidebands [10] but also reduce the difference of the minimal and the maximal value of the absolute value of the negative vector potential | A(t )|. As described above, higher values of E 390 /E 780 lead to a more accurate mapping of the offset angle, α, to the phase gradient of the initial momentum distribution after tunneling, φ off .…”

Section: Recipe For the Experimental Access To Changes Of The Wimentioning

confidence: 93%

“…The origin of this pattern is a subcycle interference which has been observed experimentally and reproduced using saddlepoint strong field approximation as well as by solving the time-dependent Schrödinger equation [8,9]. Recently, Feng et al [10] have succeeded to model the appearance of sidebands for linearly polarized light by considering semiclassical trajectories that have release times that differ exactly by T 390 which is one cycle of the 2ω field.…”

Section: Introductionmentioning

confidence: 94%

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Holographic angular streaking of electrons and the Wigner time delay

Eckart

2020

Phys. Rev. Research

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For a circularly polarized single-color field at a central frequency of 2ω, the final electron momentum distribution upon strong field ionization does not carry any information about the phase of the initial momentum distribution. Adding a weak, corotating, circularly polarized field at a central frequency of ω gives rise to a subcycle interference pattern [holographic angular streaking of electrons (HASE)]. This interference pattern allows for the retrieval of the derivative of the phase of the initial momentum distribution after tunneling φ off (p i). A trajectory-based semiclassical model (HASE model) is introduced which links the experimentally accessible quantities to φ off (p i). It is shown that a change in φ off is equivalent to a displacement in position space x of the initial wave packet after tunneling. This offset in position space allows for an intuitive interpretation of the Wigner time delay τ W in strong-field ionization for circularly polarized single-color fields. The influence of Coulomb interaction after tunneling is investigated quantitatively.

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Section: Recipe For the Experimental Access To Changes Of The Wimentioning

confidence: 93%

Section: Introductionmentioning

confidence: 94%

Holographic angular streaking of electrons and the Wigner time delay

Eckart

2020

Phys. Rev. Research

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“…To meet that challenge, a recently suggested alternative interferometric approach toward Δ τ W,M in momentum space termed “holographic angular streaking of electrons” (HASE) 13 can be used which builds on refs. 25 , 26 . This scheme exploits semi-classical trajectories to model the interference occurring for tunnel ionization 25 , 27 – 29 triggered by a co-rotating two-color (CoRTC) laser field.…”

Section: Resultsmentioning

confidence: 99%

Angular dependence of the Wigner time delay upon tunnel ionization of H2

et al. 2021

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When a very strong light field is applied to a molecule an electron can be ejected by tunneling. In order to quantify the time-resolved dynamics of this ionization process, the concept of the Wigner time delay can be used. The properties of this process can depend on the tunneling direction relative to the molecular axis. Here, we show experimental and theoretical data on the Wigner time delay for tunnel ionization of H2 molecules and demonstrate its dependence on the emission direction of the electron with respect to the molecular axis. We find, that the observed changes in the Wigner time delay can be quantitatively explained by elongated/shortened travel paths of the emitted electrons, which occur due to spatial shifts of the electrons’ birth positions after tunneling. Our work provides therefore an intuitive perspective towards the Wigner time delay in strong-field ionization.

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“…Aperiodic quasicrystals of Fibonacci multilayer dielectrics have many fascinating optical properties, such as mode beating, strong pulse stretching, and band-edge resonances [55]. The band-edge resonances can localize the electric field [56]. Moreover, the localization of field can be further enhanced by increasing the gain and loss in our PT-symmetric structure [19].…”

Section: Aperiodic Pt Symmetry Latticesmentioning

confidence: 99%

Low Threshold Optical Bistability in Aperiodic PT-Symmetric Lattices Composited with Fibonacci Sequence Dielectrics and Graphene

Zhao

Guo

et al. 2019

Applied Sciences

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We explore the optical bistability in aperiodic parity–time-symmetric (PT-symmetric) photonic lattices that are composed of Fibonacci sequence dielectrics and graphene at terahertz frequencies. Two Fibonacci sequence dielectrics, viz. aperiodic photonic lattices, are utilized for enhancing band-edge resonances and achieving the electric field localization that can enhance the nonlinearity of graphene. Modulating the gain-loss factor of dielectrics in the PT symmetry lattices further strengthens the nonlinearity effect and, consequently, low threshold bistability is realized. The interval between the upper and lower bistability thresholds enlarges as the momentum relaxation time of graphene changes. Moreover, we show that the bistability threshold can also be flexibly tuned by modulating the graphene chemical potential. The study might be applied in photomemories and optical switches.

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Semiclassical analysis of photoelectron interference in a synthesized two-color laser pulse

Cited by 29 publications

References 46 publications

Holographic angular streaking of electrons and the Wigner time delay

Holographic angular streaking of electrons and the Wigner time delay

Angular dependence of the Wigner time delay upon tunnel ionization of H2

Low Threshold Optical Bistability in Aperiodic PT-Symmetric Lattices Composited with Fibonacci Sequence Dielectrics and Graphene

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