Coupled-square-well model and Fano-phase correspondence

Yan, Bin; Greene, Chris H.

doi:10.1103/physreva.95.032706

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…The coupling term V cpl (x) is a hyper-gaussian function optimised empirically to obtain the desired resonance parameters, q and Γ R . This model reproduces very well the features of Fano resonances [37], and is simple enough to allow extensive time-dependent and time-independent numerical simulations.…”

Section: Coupled-channel Modelmentioning

confidence: 73%

Ionization dynamics through a Fano resonance: Time-domain interpretation of spectral amplitudes

et al. 2018

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We investigate a conjecture used in recent experiments to reconstruct the complete dynamics of Fano autoionisation processes out of measured spectral amplitudes [Gruson et al, Science 354 734 (2016); Beaulieu el al, Science 358 1288 (2017); Busto et al, J. Phys. B: At. Mol. Opt. Phys. 51 044002 (2018)]. The validity of the conjecture is established analytically within the formalism of Fano, and tested numerically on model atoms displaying adjustable autoionising states. A general condition for which the conjecture is valid, beyond the Fano case, is then derived. arXiv:1809.08413v2 [physics.atom-ph]

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Section: Coupled-channel Modelmentioning

confidence: 73%

Ionization dynamics through a Fano resonance: Time-domain interpretation of spectral amplitudes

et al. 2018

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“…All these measurements now possible of very short time scales allow the probing of Fano resonances in the time domain, following their very build up [41][42][43][44] in time. See also a pedagogical treatment in [45]. Remarkably, even shorter time scales can now be measured.…”

Section: Phase Shifts and Their Derivativesmentioning

confidence: 99%

A Tale of Two Representations: Energy and Time in Photoabsorption

Rau

2021

Preprint

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This essay is based on a talk at Advances in Atomic, Molecular, and Optical Sciences 2020 (AAMOS20) in a symposium honoring Prof. S. T. Manson's decades-long contribution to photoabsorption studies. Quantum physics introduced into physics pairs of conjugate quantities bearing a specific complementary relationship, energy and time being one such pair. This gives rise to two alternative representations, a time-dependent and a time-independent one, seemingly very different but both capable of embracing the same physics. They give complementary descriptions and insight, with technical questions, theoretical and experimental, determining which may be the more convenient and practicable at any juncture. Two recent topics, Cooper minima in photoabsorption in Cl − and Ar, and angular-momentum barrier tunneling of f photoelectrons from Se in WSe2, provide illustrative examples, also of the role that technological developments over the past five decades played in our approach to and understanding of phenomena.

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“…Fano resonance is a widespread wave-scattering phenomenon. It has been widely studied in atoms ( 2 – 4 ), molecules ( 5 – 8 ), nuclei ( 9 , 10 ), solids ( 11 ), nanostructure ( 12 ), and acoustic systems. Since the asymmetric line shape is sensitive to the structure, as well as to the environment, the so-called topological Fano resonances have been found to have wide applications ( 13 ).…”

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confidence: 99%

Controlling laser-dressed resonance line shape using attosecond extreme-ultraviolet pulse with a spectral minimum

Fu,

Wang,

Wang

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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High-harmonic generation from a gas target exhibits sharp spectral features and rapid phase variation near the Cooper minimum. By applying spectral filtering, shaped isolated attosecond pulses can be generated where the pulse is split into two in the time domain. Using such shaped extreme-ultraviolet (XUV) pulses, we theoretically study attosecond transient absorption (ATA) spectra of helium 2 s 2 p autoionizing state which is resonantly coupled to the 2 s 2 dark state by a time-delayed infrared laser. Our simulations show that the asymmetric 2 s 2 p Fano line shape can be readily tuned into symmetric Lorentzian within the time delay of a few tens of attoseconds. Such efficient control is due to the destructive interference in the generation of the 2 s 2 p state when it is excited by a strongly shaped XUV pulse. This is to be compared to prior experiments where tuning the line shape of a Fano resonance would take tens of femtoseconds. We also show that the predicted ATA spectral line shape can be observed experimentally after propagation in a gas medium. Our results suggest that strongly shaped attosecond XUV pulses offer the opportunity for controlling and probing fine features of narrow resonances on the few-ten attoseconds timescale.

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Coupled-square-well model and Fano-phase correspondence

Cited by 6 publications

References 37 publications

Ionization dynamics through a Fano resonance: Time-domain interpretation of spectral amplitudes

Ionization dynamics through a Fano resonance: Time-domain interpretation of spectral amplitudes

A Tale of Two Representations: Energy and Time in Photoabsorption

Controlling laser-dressed resonance line shape using attosecond extreme-ultraviolet pulse with a spectral minimum

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