Time-dependent QED approach to x-ray nonlinear Compton scattering

Krebs, Dietrich; Reis, David A.; Santra, Robin

doi:10.1103/physreva.99.022120

Cited by 17 publications

(18 citation statements)

References 64 publications

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“…Our calculations support the conclusion in Ref. [15] that it is not the bound character of the electron that is causing the anomalous frequency shift seen in Fuchs et al [13].…”

Section: Semi-compton Processsupporting

confidence: 91%

“…We were able to obtain convergent results for both the differential cross section and the average scattered photon momentum for both linear Compton and non-linear Compton scattering. While we mainly agree with the results of Krebs et al [15], our calculations reveal a small blue-shift in the frequency of the scattered photon with respect to the free-electron results. Following this, we explore two possible alternate causes for the redshift.…”

Section: Introductionsupporting

confidence: 91%

“…Despite the electrons being bound, the calculations for the differential cross section agreed with the Brown and Kibble results. The calculations did not exhibit a redshift in the wavelength of the scattered photon, in disagreement with the experiment [13] but in agreement with the calculations of Krebs et al [15]. For bound V. ACKNOWLEDGEMENTS This material is based upon work supported by the US Department of Energy, Office of Science, Basic Energy Sciences, under Award No.…”

supporting

confidence: 85%

“…To explain this additional redshift(∼800 eV), they proposed that the bound nature of the beryllium electrons could be responsible. This argument was analyzed by Krebs et al [15]. They solved the TDSE to simulate the non-linear X-ray scattering, with the bound electrons being modelled by a potential based on the Hartree-Fock-Slater model.…”

Section: Introductionmentioning

confidence: 99%

“…We use a numerical approach different from that of Ref. [15] and study the effect of binding energy, electron-electron correlation, and photoionization on the non-linear Compton spectrum. We were able to obtain convergent results for both the differential cross section and the average scattered photon momentum for both linear Compton and non-linear Compton scattering.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of nonlinear Compton scattering from bound electrons

Venkatesh

Robicheaux

2020

Phys. Rev. A

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Recent investigations by Fuchs et al. [Nat. Phys. 11, 964 (2015)] revealed an anomalous frequency shift in non-linear Compton scattering of high-intensity X-rays by electrons in solid beryllium. This frequency shift was at least 800 eV to the red of the values predicted by analytical free-electron models for the same process. In this paper, we describe a method for simulating non-linear Compton scattering. The method is applied to the case of bound electrons in a local, spherical potential to explore the role of binding energy in the frequency shift of scattered X-rays for different scattered angles. The results of the calculation do not exhibit an additional redshift for the scattered X-rays beyond the non-linear Compton shift predicted by the free-electron model. However, it does reveal a small blue-shift relative to the free electron prediction for non-linear Compton scattering. The effect of electron-electron correlation effects is calculated and determined to be unlikely to be the source of the redshift. The case of linear Compton scattering from a photoionized electron followed by electron recapture is examined as a possible source of the redshift and ruled out.

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“…Our calculations support the conclusion in Ref. [15] that it is not the bound character of the electron that is causing the anomalous frequency shift seen in Fuchs et al [13].…”

Section: Semi-compton Processsupporting

confidence: 91%

Section: Introductionsupporting

confidence: 91%

supporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simulation of nonlinear Compton scattering from bound electrons

Venkatesh

Robicheaux

2020

Phys. Rev. A

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Photon–Atom Interactions: Intermediate Energies

Bromley

2023

Springer Handbooks

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The quantum-optical nature of high harmonic generation

et al. 2020

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High harmonic generation (HHG) is an extremely nonlinear effect generating coherent broadband radiation and pulse durations reaching attosecond timescales. Conventional models of HHG that treat the driving and emitted fields classically are usually very successful but inherently cannot capture the quantum-optical nature of the process. Although prior work considered quantum HHG, it remains unknown in what conditions the spectral and statistical properties of the radiation depart considerably from the known phenomenology of HHG. The discovery of such conditions could lead to novel sources of attosecond light having squeezing and entanglement. Here, we present a fully-quantum theory of extreme nonlinear optics, predicting quantum effects that alter both the spectrum and photon statistics of HHG, thus departing from all previous approaches. We predict the emission of shifted frequency combs and identify spectral features arising from the breakdown of the dipole approximation for the emission. Our results show that each frequency component of HHG can be bunched and squeezed and that each emitted photon is a superposition of all frequencies in the spectrum, i.e., each photon is a comb. Our general approach is applicable to a wide range of nonlinear optical processes, paving the way towards novel quantum phenomena in extreme nonlinear optics.

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Time-dependent QED approach to x-ray nonlinear Compton scattering

Cited by 17 publications

References 64 publications

Simulation of nonlinear Compton scattering from bound electrons

Simulation of nonlinear Compton scattering from bound electrons

Photon–Atom Interactions: Intermediate Energies

The quantum-optical nature of high harmonic generation

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