Attosecond tunnelling interferometry

Pedatzur, Oren; Orenstein, Gal; Serbinenko, Valeria; Soifer, Hadas; Bruner, Barry D.; Uzan, Ayelet J.; Brambila, Danilo Simoes; Harvey, Alex G.; Torlina, Lisa; Morales, Felipe; Smirnova, Olga; Dudovich, Nirit

doi:10.1038/nphys3436

Cited by 106 publications

(94 citation statements)

References 30 publications

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“…Both CQSFA and SFA simulations significantly deviate from the adiabatic tunneling theory (blue lines in Fig. 7), in which the electron is assumed to begin its journey in the continuum with vanishing velocity [1,51,52].…”

Section: Resultsmentioning

confidence: 99%

Near-threshold photoelectron holography beyond the strong-field approximation

Lai¹,

Yu²,

Huang³

et al. 2017

Phys. Rev. A

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We study photoelectron angular distributions (PADs) near the ionization threshold with a newly developed Coulomb quantum-orbit strong-field approximation (CQSFA) theory. The CQSFA simulations exhibit an excellent agreement with the result from the time-dependent Schrödinger equation. We show that the low-energy fan-shaped pattern in the PADs corresponds to a subcycle time-resolved holographic structure and stems from the significant influence of the Coulomb potential on the phase of the forward-scattered electron trajectories, which affects different momenta and scattering angles unequally. Our work provides a direct explanation of how the fan-shaped structure is formed, based on the quantum interference of direct and forward-scattered orbits. Moreover, our work shows that the fan-shaped pattern can be used to extract information on the target structure, as the number of fringes in the PADs depends strongly on the symmetry of the electronic bound state.

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Section: Resultsmentioning

confidence: 99%

Near-threshold photoelectron holography beyond the strong-field approximation

Lai¹,

Yu²,

Huang³

et al. 2017

Phys. Rev. A

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“…Thus, the odd arrangements of two general point interactions constitute a three parameter family of interactions. From Equation (14) one can see that, given an arbitrary point interaction, it is always possible to find a suitable second point interaction resulting on an even arrangement 4 ; on the other hand, odd double point interactions are more restrictive and can only be built by combining very specific kinds of point interactions, as revealed by the constraints on the parameters of the two b.c. matrices indicated in Equation (16).…”

Section: Double Barrier Of Generalized Point Interactions: Symmetry Umentioning

confidence: 99%

“…The difficulties involved in the problem are both experimental and theoretical. The time scales involved, typically of the order of attoseconds, only recently became accessible experimentally [3][4][5], and the interpretation of the experimental results is not yet free of controversy [5,6]. From the theoretical point of view, the difficulties are related to the impossibility of defining a self-adjoint (observable) time operator in quantum mechanics.…”

Section: Introductionmentioning

confidence: 99%

Double General Point Interactions: Symmetry and Tunneling Times

et al. 2016

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We consider the one dimensional problem of a non-relativistic quantum particle scattering off a double barrier built from two generalized point interactions (each one characterized as a member of the four parameter family of point interactions). The properties of the double point barrier under parity transformations are investigated, using the distributional approach, and the constraints on the parameters necessary for the interaction to have a well-defined parity are obtained. We show that the limit of zero interbarrier distance of a renormalized odd arrangement with two δ ′ is either trivial or does not exist as a generalized point interaction. Finally, we specialize to double barriers with defined parity, calculate the phase and Salecker-Wigner-Peres clock times and argue that the emergence of the generalized Hartman effect is an artifact of the extreme opaque limit.

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“…The authors concluded that, for reliable characterisation of the emission times via the two-color harmonic generation, one needs accurate determination of the experimental intensity, which allows one to include the changes in the ionization amplitude as a function of φ. This point was further developed and used to characterize the ionization dynamics in our work [154], as discussed later in this Thesis. A significant step in the implementation of two-color harmonic generation to understanding atomic and molecular attosecond dynamics was achieved in [93].…”

Section: Chapter 2 Application Of High Harmonic Generation To Studiementioning

confidence: 99%

“…In this chapter, we will consider the procedure for extracting real part of the ionization time, presented in [93]. We will also study the two options for obtaining the imaginary part of the ionization time from the two-dimensional spectrum [154,162].…”

Section: Saddle Points For the Multicolor Fieldsmentioning

confidence: 99%

Multidimensional high harmonic spectroscopy

Serbinenko

Smirnova

2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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Multidimensional high harmonic spectroscopy is a cutting-edge technique for studying the effect of the intense low-frequency laser fields on atoms and molecules. The high energy photons, emitted by a particle as a result of the interaction with the strong laser field, carry the information about the processes in atoms and molecules, which lead to the emission. Multidimensional character of the technique allows to extract parameters of the molecular and atomic ionization dynamics, that were inaccessible before in the same experiment, such as sub-cycle ionization rates, ionization and recombination times.The Thesis presents in detail theoretical analysis of the multidimensional high harmonic generation process within semi-classical approach. Several generating field configurations are considered. The developed theoretical apparatus is then applied to describe multidimensional high harmonic spectroscopy experiments in helium. Initial analysis of the applicability of the technique for the study of multielectron dynamics in carbon dioxide is also performed.The problems, solutions to which are presented in the Thesis, are:• theoretical description of high harmonic generation in multicolor fields• analysis of the gating techniques for the extraction of the parameters of electron trajectories in high harmonic generation in He• proposition of an alternative reconstruction procedure of electron trajectory parameters, that allows one to access to all of them simultaneouslyThe main results of our work are:• Based on theoretical analysis of multidimensional high harmonic generation, we showed, that optimization of the two-dimensional harmonic 3 signal is achieved at each step of the process: ionization, propagation, dynamics in the ion and recombination• We demonstrated, that multidimensional high harmonic spectroscopy is a very sensitive tool allowing one to extract parameters of electron trajectories, such as complex ionization time and complex electron momentum, from the observed harmonic signal• We developed and applied theory to the analysis of two-color high harmonic generation experiments of He atom• We performed initial analysis of two-color HHG experiments in carbon dioxide, which was necessary for further investigation and reconstruction I thank Bettina Becker, the most helpful person in the institute or in the whole world, who made the bureaucratic problems very easy. There was no question she didn't answer and no problem she didn't solve quickly and efficiently.

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Attosecond tunnelling interferometry

Cited by 106 publications

References 30 publications

Near-threshold photoelectron holography beyond the strong-field approximation

Near-threshold photoelectron holography beyond the strong-field approximation

Double General Point Interactions: Symmetry and Tunneling Times

Multidimensional high harmonic spectroscopy

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