Relativistic Three-Body Recombination with the QED Vacuum

Hu, Huayu; Müller, Carsten

doi:10.1103/physrevlett.107.090402

Cited by 11 publications

(13 citation statements)

References 33 publications

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“…The S-matrix element (14) becomes identical to that of nonlinear Compton scattering if one identifies −l µ (ε * µ ) with the outgoing photon momentum (polarisation) in that process. The key differences in the two processes enter at the level of the probability (or cross section), due to the different number of incoming and outgoing particles.…”

Section: Properties Of the Absorption Cross Sectionmentioning

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: Properties Of the Absorption Cross Sectionmentioning

confidence: 99%

Absorption cross section in an intense plane wave background

2019

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“…The strong-field S matrix for laser-assisted Compton scattering of an x-ray photon from a short coherent XFEL pulse can be acquired by first formulating the Furry picture of strong field QED with respect to both the (weak) XFEL and (strong) assisting laser pulses. The resulting expressions are then linearised in the normalised amplitude of the XFEL pulse a 1 X  [69,70]. The S matrix can be represented as [34] S a p p k 4ie…”

Section: Appendix a Derivation Of The Differential Cross Sectionmentioning

confidence: 99%

Caustic structures in x-ray Compton scattering off electrons driven by a short intense laser pulse

et al. 2016

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We study the Compton scattering of x-rays off electrons that are driven by a relativistically intense short optical laser pulse. The frequency spectrum of the laser-assisted Compton radiation shows a broad plateau in the vicinity of the laser-free Compton line due to a nonlinear mixing between x-ray and laser photons. Special emphasis is placed on how the shape of the short assisting laser pulse affects the spectrum of the scattered x-rays. In particular, we observe sharp peak structures in the plateau region, whose number and locations are highly sensitive to the laser pulse shape. These structures are interpreted as spectral caustics by using a semiclassical analysis of the laser-assisted QED matrix element, relating the caustic peak locations to the laser-driven electron motion.

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“…Note: After we submitted the paper, two manuscripts appeared in arXiv [21,23], where the BCS-BEC crossover with SOC (but without Zeeman fields) is discussed.…”

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confidence: 99%

BCS-BEC Crossover and Topological Phase Transition in 3D Spin-Orbit Coupled Degenerate Fermi Gases

2011

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We investigate the BCS-BEC crossover in three-dimensional degenerate Fermi gases in the presence of spin-orbit coupling (SOC) and Zeeman field. We show that the superfluid order parameter destroyed by a large Zeeman field can be restored by the SOC. With increasing strengths of the Zeeman field, there is a series of topological quantum phase transitions from a nontopological superfluid state with fully gapped fermionic spectrum to a topological superfluid state with four topologically protected Fermi points (i.e., nodes in the quasiparticle excitation gap) and then to a second topological superfluid state with only two Fermi points. The quasiparticle excitations near the Fermi points realize the long-sought low-temperature analog of Weyl fermions of particle physics. We show that the topological phase transitions can be probed using the experimentally realized momentum-resolved photoemission spectroscopy.

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Relativistic Three-Body Recombination with the QED Vacuum

Cited by 11 publications

References 33 publications

Absorption cross section in an intense plane wave background

Absorption cross section in an intense plane wave background

Caustic structures in x-ray Compton scattering off electrons driven by a short intense laser pulse

BCS-BEC Crossover and Topological Phase Transition in 3D Spin-Orbit Coupled Degenerate Fermi Gases

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