Compton Scattering of an Intense Photon Beam

Frantz, Lee M.

doi:10.1103/physrev.139.b1326

Cited by 53 publications

(44 citation statements)

References 8 publications

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“…In both the probability and spectrum there is a "dip" as respectively u and s are increased. This is a χ e < 1 effect, which is most readily explained by considering the argumentẑ of the Airy function in the LCFA (see (38) and (39)) and focusing on the differential energy spectrum Fig. 3.…”

Section: A Comparison: Lcfa Vs Monochromaticmentioning

confidence: 99%

Absorption cross section in an intense plane wave background

2019

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We consider the absorption of probe photons by electrons in the presence of an intense, pulsed, background field. Our analysis reveals an interplay between regularisation and gauge invariance which distinguishes absorption from its crossing-symmetric processes, as well as a physical interpretation of absorption in terms of degenerate processes in the weak field limit. In the strong field limit we develop a locally constant field approximation (LCFA) for absorption which also exhibits new features. We benchmark the LCFA against exact analytical calculations and explore its regime of validity. Pulse shape effects are also investigated, as well as infra-red and collinear limits of the absorption process.

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Section: A Comparison: Lcfa Vs Monochromaticmentioning

confidence: 99%

Absorption cross section in an intense plane wave background

2019

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“…The initial electron state is given as a superposition of Volkov states individually denoted by |p (whereas in previous sections this ket denoted a free-particle state). Since the incident laser field is accounted for in the dressing of the Dirac field operator, the initial quantum state contains no photons [26]: The lowest-order matrix element represents the emission of a single photon:…”

Section: Laser-dressed Photoemissionmentioning

confidence: 99%

Quantum-electrodynamic treatment of photoemission by a single-electron wave packet

Corson

Peatross

2011

Phys. Rev. A

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A quantum-field-theory description of photoemission by a laser-driven single-electron wave packet is presented. We show that, when the incident light is represented with multimode coherent states then, to all orders of perturbation theory, the relative phases of the electron's constituent momenta have no influence on the amount of scattered light. These results are extended using the Furry picture, where the (unidirectional) arbitrary incident light pulse is treated nonperturbatively with Volkov functions. This analysis increases the scope of our prior results in [Phys. Rev. A 84, 053831 (2011)], which demonstrate that the spatial size of the electron wave packet does not influence photoemission.

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“…Here S ext is the background field action in which the matter fields are, as well as being coupled to the dynamical photon field, coupled to the background (21). If the background is strong, this coupling should be accounted for in the Furry picture, as in Fig.…”

Section: Weak Depletion Of a Strong Fieldmentioning

confidence: 99%

“…Consider a real scalar field A (the 'photon' from the scalar Yukawa model) coupled to a given external source/sink J. Including the complex field describing the asymptotic coherent states of the A-field, the action is with A D as in (21). Since the scalar field couples linearly to the source the presence of A D in the action only trivially affects scattering processes, given a further exponential prefactor.…”

Section: A Exactly Soluble Toy Modelmentioning

confidence: 99%

Backreaction on background fields: A coherent state approach

Ilderton

Seipt

2018

Phys. Rev. D

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There are many situations in which a strong electromagnetic field may be approximated as a fixed background. Going beyond this approximation, i.e. accounting for the back-reaction of quantum process on the field, is however challenging. Here we develop an approach to this problem which is a straightforward extension of background field methods. The approach follows from the observation that scattering in an on-shell background is equivalent to scattering between coherent states; we show that by deforming these states one can model back-reaction. Focussing on intense laser-matter interactions, we provide examples which model beam depletion and, furthermore, introduce an extremisation principle with which to determine the level of depletion in a given scattering process.

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Compton Scattering of an Intense Photon Beam

Cited by 53 publications

References 8 publications

Absorption cross section in an intense plane wave background

Absorption cross section in an intense plane wave background

Quantum-electrodynamic treatment of photoemission by a single-electron wave packet

Backreaction on background fields: A coherent state approach

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