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

Corson, John; Peatross, Justin

doi:10.1103/physreva.84.053832

Cited by 23 publications

(32 citation statements)

References 37 publications

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“…It is emphasized that these suggested experimental schemes measure the 'history-dependent' size of the wavepacket s ( ) t z D , and not its fundamental (coherence length) size  s s = 2 z p 0 0 . Other schemes for measuring the quantum wavepacket characteristics that have been considered earlier, such as Compton-scattering by an electron wavepacket [32][33][34] or wavepacket self-interference [44,45], cannot provide such information.…”

Section: Discussionmentioning

confidence: 99%

“…. A striking difference between these expressions and the corresponding cases for the unmodulated quantum wavepacket (29a), (32) is that the modulated wavepacket can emit/absorb radiation at frequencies beyond the quantum cut-off condition (1), which occur at all harmonic frequencies w l b of the wavepacket modulation of significant component amplitude B l .…”

Section: Modulated Quantum Wavepacketmentioning

confidence: 99%

“…In that case, using (14)- (15), (22) one gets Figure 4 shows the harmonics of current bunching amplitude factor w | ( )| B l as function of frequency ( figure 3(a)) and drift time ( figure 3(b)) for opticallymodulated electron wavepacket, where the coefficient B l was evaluated from equation 16. Using equations (34) in (21a), the expressions for spontaneous emission by a single electron modulated wavepacket is…”

Section: Modulated Quantum Wavepacketmentioning

confidence: 99%

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Spontaneous and stimulated radiative emission of modulated free-electron quantum wavepackets—semiclassical analysis

Pan¹,

Gover²

2018

J. Phys. Commun.

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Here we present a semiclassical analysis of spontaneous and stimulated radiative emission from unmodulated and optically-modulated free-electron quantum wavepackets. We show that the radiative emission/absorption and corresponding deceleration/acceleration of the wavepackets depend on the controllable 'history-dependent' wavepacket size. The characteristics of the radiative interaction when the wavepacket size (duration) is short relative to the radiation wavelength, are close to the predictions of the classical point-particle modelling. On the other hand, in the long-sized wavepacket limit, the interaction is quantum-mechanical, and it diminishes exponentially at high frequency. We exemplify these effects through the scheme of Smith-Purcell radiation, and demonstrate that if the wavepacket is optically-modulated and periodically-bunched, it exhibits finite radiative emission at harmonics of the modulation frequency beyond the limit of high-frequency cutoff. Besides, the radiation analysis is further extended to the cases of superradiant emission from a beam of phase-correlated modulated electron wavepackets. The features of the wavepacket-dependent radiative emission explain the classical-to-quantum transition, and indicate a way for measuring the quantum electron wavepacket size. This suggests a new direction for exploring light-matter interaction.

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Section: Discussionmentioning

confidence: 99%

Section: Modulated Quantum Wavepacketmentioning

confidence: 99%

Section: Modulated Quantum Wavepacketmentioning

confidence: 99%

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Spontaneous and stimulated radiative emission of modulated free-electron quantum wavepackets—semiclassical analysis

Pan¹,

Gover²

2018

J. Phys. Commun.

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“…(5B) in the limit of weak coupling, and apply it to compare the cases of a single finite size QEW, modulated QEWs, and the conventional point-particle limit. Whether a single QEW interaction with matter can be observed and measured is a fundamental physics question that has been considered in connection to interaction of QEW with light [15,32,33]; here we consider it in the case of interaction with matter.…”

mentioning

confidence: 99%

Free-Electron–Bound-Electron Resonant Interaction

Gover

Yariv

2020

Phys. Rev. Lett.

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Here we present a new paradigm of free-electron-bound-electron resonant interaction. This concept is based on a recent demonstration of the optical frequency modulation of the free-electron quantum electron wave function (QEW) by an ultrafast laser beam. We assert that pulses of such QEWs correlated in their modulation phase, interact resonantly with two-level systems, inducing resonant quantum transitions when the transition energy ΔE ¼ ℏω 21 matches a harmonic of the modulation frequency ω 21 ¼ nω b. Employing this scheme for resonant cathodoluminescence and resonant EELS combines the atomic level spatial resolution of electron microscopy with the high spectral resolution of lasers.

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“…It is interesting to consider how a large electron wave packet scatters radiation when different parts of the same wave function oscillate out of phase in the driving laser field. Quantum electrodynamics (QED) predicts that an electron radiates with the strength of a point emitter, regardless of the spatial extent of its wave packet [16,17]. This is in contrast with a first-quantized picture where one might intuitively expect that radiation from a single large electron wave packet undergoes interference and suppression [18].…”

Section: Introductionmentioning

confidence: 97%

Radiation from free electrons in a laser focus at 10^18 W/cm^2: modeling of photon yields and required focal conditions

et al. 2015

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In support of an experiment designed to measure the strength of radiation scattered from low-density free electrons in an intense laser focus, we model a variety of physical parameters that impact the rate of scattered photons. We employ a classical model to characterize duration of electron exposure to high-intensity laser light in a situation where the electrons are driven by strong ponderomotive gradients. Free electrons are modeled as being donated by low-density helium, which undergoes strong-field ionization early in the pulse or during a prepulse. When exposed to relativistic intensities, free electrons experience a Lorentz drift that causes redshifting of the scattered 800 nm light. This redshift can be used as a signature to discern light scattered from the more intense regions of the focus. We characterize the focal volume of initial positions leading to significant redshifting, given a peak intensity of 2 × 10 18 W∕cm 2 . Under this scenario, the beam waist needs to be larger than several wavelengths for a pulse duration of 35 fs. We compute the rate of redshifted scattered photons from an ensemble of electrons distributed throughout the focus and relate the result to the scattered-photon rate of a single electron. We also estimate to what extent the ionization process may produce unwanted light in the redshifted spectral region.

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

Cited by 23 publications

References 37 publications

Spontaneous and stimulated radiative emission of modulated free-electron quantum wavepackets—semiclassical analysis

Spontaneous and stimulated radiative emission of modulated free-electron quantum wavepackets—semiclassical analysis

Free-Electron–Bound-Electron Resonant Interaction

Radiation from free electrons in a laser focus at 10^18 W/cm^2: modeling of photon yields and required focal conditions

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