Observation of correlations beyond the single-particle picture in fermionic counting statistics
Abstract
The analysis of charge fluctuations in a mesoscopic device can shed light on the fundamental question of whether or not a single-particle picture of electron transport is appropriate, even in the presence of Coulomb interaction. It has been shown on general grounds that mapping the interacting system onto a fermionic single-particle description is subject to strict constraints on the charge-transfer statistics. These constraints can be formulated in terms of a sign rule for the factorial cumulants of the full counting statistics. We report here on the experimental observation of a sign-rule violation in a most elementary model system, i.e. a single-level quantum dot, and provide theoretical modeling that can quantitatively reproduce the experimental data. This reveals the presence of correlations introduced by electron-electron interaction.
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BibTeX
@misc{zollner2026observation,
title = {{Observation of correlations beyond the single-particle picture in fermionic counting statistics}},
author = {Johann Zöllner and Hendrik Mannel and Daniel Oppers and Martin Geller and Axel Lorke and Jürgen König},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.19950},
eprint = {2610.19950},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.19950},
}
RIS
TY - UNPB
TI - Observation of correlations beyond the single-particle picture in fermionic counting statistics
AU - Johann Zöllner
AU - Hendrik Mannel
AU - Daniel Oppers
AU - Martin Geller
AU - Axel Lorke
AU - Jürgen König
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.19950
UR - https://arxiv.org/abs/2610.19950
AB - The analysis of charge fluctuations in a mesoscopic device can shed light on the fundamental question of whether or not a single-particle picture of electron transport is appropriate, even in the presence of Coulomb interaction. It has been shown on general grounds that mapping the interacting system onto a fermionic single-particle description is subject to strict constraints on the charge-transfer statistics. These constraints can be formulated in terms of a sign rule for the factorial cumulants of the full counting statistics. We report here on the experimental observation of a sign-rule violation in a most elementary model system, i.e. a single-level quantum dot, and provide theoretical modeling that can quantitatively reproduce the experimental data. This reveals the presence of correlations introduced by electron-electron interaction.
ER -