Time-resolving electron-core dynamics during strong-field ionization in circularly polarized fields

Torlina, Lisa; Kaushal, Jivesh; Smirnova, Olga

doi:10.1103/physreva.88.053403

Cited by 56 publications

(98 citation statements)

References 18 publications

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“…(48) must be positive gives the lower bound nω > U p + I p − 8U p /π 2 for n. Furthermore, if the electron leaves at a field crest, one may set p z = p x = 0 in Eq. (48). This yields the upper bound n ≤ I p + U p .…”

Section: A Strong-field Approximationmentioning

confidence: 96%

“…The action then reads S(p, r, t, t ) = S tun (p, r, t r , t ) + S prop (p, r, t, t r ), (16) where S tun (p, r, t r , t ) and S prop (p, r, t, t r ) give the action along the first and second part of the contour, respectively. This type of contour has been widely used in the literature [36,[48][49][50]. We assume the electron momentum to be approximately constant in the first arm of the contour.…”

Section: B Coulomb Quantum-orbit Strong-field Approximationmentioning

confidence: 99%

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Coulomb-corrected quantum interference in above-threshold ionization: Working towards multitrajectory electron holography

et al. 2017

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Using the recently developed Coulomb Quantum Orbit Strong-Field Approximation (CQSFA), we perform a systematic analysis of several features encountered in above-threshold ionization (ATI) photoelectron angle-resolved distributions (PADs), such as side lobes, and intra-and intercycle interference patterns. The latter include not only the well-known intra-cycle rings and the near-threshold fan-shaped structure, but also previously overlooked patterns. We provide a direct account of how the Coulomb potential distorts different types of interfering trajectories and changes the corresponding phase differences, and show that these patterns may be viewed as generalized holographic structures formed by up to three types of trajectories. We also derive analytical interference conditions and estimates valid in the presence or absence of the residual potential, and assess the range of validity of Coulomb-corrected interference conditions provided in the literature.

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Section: A Strong-field Approximationmentioning

confidence: 96%

Section: B Coulomb Quantum-orbit Strong-field Approximationmentioning

confidence: 99%

Coulomb-corrected quantum interference in above-threshold ionization: Working towards multitrajectory electron holography

et al. 2017

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“…And second, the authors of [42] claim that although the measured quantity (the electron momentum) is real, the trajectories in the ARM method are not classical, in the sense that the trajectories have both real and imaginary components all the way to the detector, where they claim that the real part of the trajectory starts near the origin without an explicit definition [65]. This, in turn, shows that in the tunneling process, real and imaginary components of a trajectory and (hence) real and imaginary components of time can exist (quantum mechanically) in both the inside and outside regions (under the barrier and after tunneling, despite the differences in the definition of these regions).…”

Section: In Depth Discussionmentioning

confidence: 99%

How to understand the tunneling in attosecond experiment?

Kullie

2018

Annals of Physics

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The measurement of the tunneling time (T-time) in today's attosecond and strong field (low-frequency) experiments, despite its controversial discussion, offers a fruitful opportunity to understand time measurement and the time in quantum mechanics. In addition, as we will see in this work, a related controversial issue is the particulate nature of the radiation. Different models used to calculate the T-time will be discussed in this work in relation to my model of real T-time, Phys. Rev. 92, 052118 (2015), where an intriguing similarity to the Bohr-Einstein photon box Gedanken experiment was found. The tunneling process itself is still not well understood, but I am arguing that a scattering mechanism (by the laser wave packet) offers a possibility to understand the tunneling process in the tunneling region. This is related to the question about the corpuscular nature of light which is widely discussed in modern quantum optics experiments.Keywords: Attosecond physics, tunneling time and time measurement in attosecond experiments, timeenergy uncertainty relation, time and time-operator in quantum mechanics, Bohr-Einstein's photon box Gedanken experiment, multiphoton processing, Compton scattering, wave-particle duality. I. INTRODUCTIONThere is no doubt that the advent of 'attophysics' opens new perspectives in the study of time resolved phenomena in atomic and molecular physics [1][2][3][4][5] A similar controversial issue to the time issue (and the T-time and TEUR) is the wave-matter duality and the partic-

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“…The same is true for the Coulomb corrected SFA (CCSFA) [31,32], and the Analytic R-matrix (ARM) theory [33][34][35], which include the Coulomb field of the atomic core for the continuum electron in the eikonal approximation [that is, in the Wentzel-Kramers-Brillouin (WKB) approximation combined with the perturbative accounting of the Coulomb field in the phase of the wave function]. To describe the Wigner tunneling time delay (emerging from the derivative of the phase of the wave function) within SFA, one needs to account for the phase of the wave function during the under-the barrier dynamics, which is vanishing in the leading order of WKB-approximation.…”

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confidence: 92%

Under-the-Tunneling-Barrier Recollisions in Strong-Field Ionization

2018

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A new pathway of strong laser field induced ionization of an atom is identified which is based on recollisions under the tunneling barrier. With an amended strong field approximation, the interference of the direct and the under-the-barrier recolliding quantum orbits are shown to induce a measurable shift of the peak of the photoelectron momentum distribution. The scaling of the momentum shift is derived relating the momentum shift to the tunneling delay time according to the Wigner concept. This allows to extend the Wigner concept for the quasistatic tunneling time delay into the nonadiabatic domain. The obtained corrections to photoelectron momentum distributions are also relevant for state-of-the-art accuracy of strong field photoelectron spectrograms in general.Modern strong field photoelectron spectroscopy has achieved unprecedented momentum resolution of the order of 0.01 atomics units (a.u.), see e.g. [1][2][3], due to advancement of the measurement technique with a reaction microscope [4]. Recently the attoclock technique has been developed [5,6] based on the strong field ionization of an atom in an elliptically polarized laser field, which attempts to map the photoelectron momentum at the detector into the time of the electron appearance in the continuum during strong field ionization. In this way the attoclock technique is assumed to extract information on the time-resolved dynamics of the electron released from the atomic bound state during strong field ionization, and in particular, on the time-delay of the tunneling electron wave packet from the atom in a strong laser field [5][6][7][8][9][10]. Furthermore, the interference structures in the high-resolution photoelectron momentum distribution (PMD), created by the direct and recolliding trajectories, allow an interpretation as time-resolved holographic imaging of atoms and molecules, which admits attosecond time-and Ångström spatial-resolution [11][12][13][14]. For a correct interpretation of imaging results of the PMD based attoscience applications, one needs to understand theoretically all PMD features in details.There are many theoretical approaches for the treatment of the tunneling delay time [15][16][17], leading to different solutions and to a debate on how to explain the photoelectron momentum distribution in attoclock experiments [17][18][19]. Although all alternative definitions of the tunneling delay time are equally valid theoretical concepts, the Wigner concept [20] is physically relevant to the measurement of the photoelectron momentum distribution in the attoclock setup in the quasistatic regime, as proved in a recent experiment [10]. However the Wigner definition of the time delay via the derivative of the wave function phase, and its generalization for the strong field tunneling problem [18,[21][22][23][24] is applicable only in the quasistatic limit, i.e., when the laser induced barrier is (quasi-)static. Therefore, there is need for a generalization of the Wigner concept to the nonadiabatic regimes [25][26][27] of the strong field...

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Time-resolving electron-core dynamics during strong-field ionization in circularly polarized fields

Cited by 56 publications

References 18 publications

Coulomb-corrected quantum interference in above-threshold ionization: Working towards multitrajectory electron holography

Coulomb-corrected quantum interference in above-threshold ionization: Working towards multitrajectory electron holography

How to understand the tunneling in attosecond experiment?

Under-the-Tunneling-Barrier Recollisions in Strong-Field Ionization

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