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Keywords = fermion back-to-back correlation

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9 pages, 5171 KB  
Article
Squeezed Fermion Back-to-Back Correlation for Expanding Sources
by Yong Zhang
Universe 2025, 11(6), 166; https://doi.org/10.3390/universe11060166 - 22 May 2025
Cited by 1 | Viewed by 444
Abstract
The interaction between particles and their surrounding medium can induce a squeezed back-to-back correlation between particles and antiparticles. In this paper, the squeezed fermion back-to-back correlation (fBBC) for expanding sources is studied. The formulas of the fBBC correlation function of fermion–antifermion pairs for [...] Read more.
The interaction between particles and their surrounding medium can induce a squeezed back-to-back correlation between particles and antiparticles. In this paper, the squeezed fermion back-to-back correlation (fBBC) for expanding sources is studied. The formulas of the fBBC correlation function of fermion–antifermion pairs for expanding sources are given. The expanding flow leads to a decrease in the fBBC of proton–antiproton pairs and Λ-Λ¯ pairs in the high-momentum region, an increase in the fBBC in the low-momentum region, and a narrowing width of the fBBC varies with in-medium mass in the low-momentum region. Even though the expanding flow influences fBBC, the fBBC of proton–antiproton pairs and Λ-Λ¯ pairs can still offer possible observation signals as the collision energy varies from a few GeV to 200 GeV. Full article
(This article belongs to the Section High Energy Nuclear and Particle Physics)
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27 pages, 733 KB  
Article
Auto- versus Cross-Correlation Noise in Periodically Driven Quantum Coherent Conductors
by Michael Moskalets
Entropy 2021, 23(4), 393; https://doi.org/10.3390/e23040393 - 25 Mar 2021
Cited by 2 | Viewed by 3088
Abstract
Expressing currents and their fluctuations at the terminals of a multi-probe conductor in terms of the wave functions of carriers injected into the Fermi sea provides new insight into the physics of electric currents. This approach helps us to identify two physically different [...] Read more.
Expressing currents and their fluctuations at the terminals of a multi-probe conductor in terms of the wave functions of carriers injected into the Fermi sea provides new insight into the physics of electric currents. This approach helps us to identify two physically different contributions to shot noise. In the quantum coherent regime, when current is carried by non-overlapping wave packets, the product of current fluctuations in different leads, the cross-correlation noise, is determined solely by the duration of the wave packet. In contrast, the square of the current fluctuations in one lead, the autocorrelation noise, is additionally determined by the coherence of the wave packet, which is associated with the spread of the wave packet in energy. The two contributions can be addressed separately in the weak back-scattering regime, when the autocorrelation noise depends only on the coherence. Analysis of shot noise in terms of these contributions allows us, in particular, to predict that no individual traveling particles with a real wave function, such as Majorana fermions, can be created in the Fermi sea in a clean manner, that is, without accompanying electron–hole pairs. Full article
(This article belongs to the Special Issue Energy, Entropy, and Information in Nano- and Quantum-Electronics)
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