Altermagnetic Control of Charge-4e Superconductivity
Abstract
We show that a two-dimensional classical array of conventional superconducting islands coupled by altermagnetic Josephson junctions supports an independent charge-4e phase. Tuning the altermagnetic splitting suppresses the leading single-pair tunneling harmonic while retaining strong double-pair coupling, producing a finite charge-4e region between staggered and uniform charge-2e states. Using the complete temperature-dependent microscopic Josephson spectrum, we find short-range ordinary pair correlations alongside algebraic coherence of pairs of Cooper pairs. Berezinskii--Kosterlitz--Thouless scaling and a half-flux response further identify the charge-4e phase. Our results establish altermagnetism as a microscopic means to select between ordinary and composite superconducting coherence.
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BibTeX
@misc{yue2026altermagnetic,
title = {{Altermagnetic Control of Charge-4e Superconductivity}},
author = {Yan-Guang Yue and Jie Lou and Yan Chen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.13584},
eprint = {2610.13584},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.13584},
}
RIS
TY - UNPB
TI - Altermagnetic Control of Charge-4e Superconductivity
AU - Yan-Guang Yue
AU - Jie Lou
AU - Yan Chen
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.13584
UR - https://arxiv.org/abs/2610.13584
AB - We show that a two-dimensional classical array of conventional superconducting islands coupled by altermagnetic Josephson junctions supports an independent charge-4e phase. Tuning the altermagnetic splitting suppresses the leading single-pair tunneling harmonic while retaining strong double-pair coupling, producing a finite charge-4e region between staggered and uniform charge-2e states. Using the complete temperature-dependent microscopic Josephson spectrum, we find short-range ordinary pair correlations alongside algebraic coherence of pairs of Cooper pairs. Berezinskii--Kosterlitz--Thouless scaling and a half-flux response further identify the charge-4e phase. Our results establish altermagnetism as a microscopic means to select between ordinary and composite superconducting coherence.
ER -