Electron pair emission from a highly correlated material

Schumann, F. O.; Behnke, Lars; Li, C. H.; Kirschner, J.; Pavlyukh, Y.; Berakdar, J.

doi:10.1103/physrevb.86.035131

Cited by 15 publications

(6 citation statements)

References 53 publications

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“…10 clearly demonstrates that the positron-electron pair emission contributes significantly to the single emission rate. A monotonic relation between singles and coincidence rate was also observed in our recent (e,2e) studies on NiO and metal samples [40,41].…”

Section: Intensity Relations In Normal Incidencesupporting

confidence: 84%

Positron-electron pairs emitted from metallic and oxide surfaces

et al. 2015

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If a positron impacts onto a surface, it may lead to the emission of a positron-electron pair. We have commissioned a laboratory-based positron source and performed a systematic study on a variety of solid surfaces. In a symmetric emission geometry we can explore the fact that positrons and electrons are distinguishable particles. Following fundamental symmetry arguments we have to expect that the available energy is shared unequally among positrons and electrons. Experimentally we observe such a behavior for all materials studied. We find a universal feature for all materials in the sense that, on average, the positron carries a larger fraction of the available energy. A scattering model accounts qualitatively for the observed energy sharing in positron-electron pair emission. A comparison of the intensity levels from the different materials reveals a monotonic relation between the singles and pair coincidence count rates.

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Section: Intensity Relations In Normal Incidencesupporting

confidence: 84%

Positron-electron pairs emitted from metallic and oxide surfaces

et al. 2015

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“…www.advancedsciencenews.com www.pss-b.com actual coincidence count rates differ strongly between these materials as shown in (e,2e) and DPE experiments. [46,54] Our observations were not a priori expected. Theoretical (p,ep) calculations suggest that depending on the valence state involved either the electron or the positron is the more energetic particle.…”

Section: Positron-electron Pair Emissionmentioning

confidence: 55%

Imaging Momentum–Space Two‐Particle Correlations at Surfaces

Schumann

Kirschner

Berakdar

2020

Physica Status Solidi (b)

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Photoelectron and electron energy loss spectroscopies have been highly instrumental in revealing the various facets of electronic properties of materials. For a direct insight into two‐particle correlations, a technique is needed that resolves two emitted electrons in coincidence. Herein, an overview on the experimental realization of correlation spectroscopy and the interpretation of the recorded spectra from theory is provided. The relation of the measured spectra to the details of the spin‐, energy‐ and wavevector‐resolved electron–electron interactions is focused upon. To disentangle the contributions of exchange from the charge‐density correlation, positrons instead of electrons are used as projectiles. The short intrinsic time of the Auger decay and the neutralization of ions near a surface are used to estimate the characteristic timescale for the correlated electron dynamics in metals to be 40–400 attoseconds. The potential of conducting double photoemission studies with pulsed laser‐based light sources is addressed.

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“…Common to these samples is that, on average, the positron carries more energy than the electron. Although the sharing curves closely resemble each other, the actual coincidence count rates differ strongly between these materials as seen in (e, 2e) experiments [20].…”

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confidence: 86%

Energy Relations of Positron-Electron Pairs Emitted from Surfaces

et al. 2014

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The impact of a primary positron onto a surface may lead to the emission of a correlated positron-electron pair. By means of a lab-based positron beam we studied this pair emission from various surfaces. We analyzed the energy spectra in a symmetric emission geometry. We found that the available energy is shared in an unequal manner among the partners. On average the positron carries a larger fraction of the available energy. The unequal energy sharing is a consequence of positron and electron being distinguishable particles. We provide a model which explains the experimental findings.

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Electron pair emission from a highly correlated material

Cited by 15 publications

References 53 publications

Positron-electron pairs emitted from metallic and oxide surfaces

Positron-electron pairs emitted from metallic and oxide surfaces

Imaging Momentum–Space Two‐Particle Correlations at Surfaces

Energy Relations of Positron-Electron Pairs Emitted from Surfaces

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