Twist-Tunable Paramagnetic Superconductivity in d-wave Altermagnet/Superconductor Heterostructures
Abstract
The interplay between twist-angle engineering and unconventional magnetism provides a powerful new route to control quantum phenomena. We theoretically investigate a heterostructure comprising a d-wave superconductor proximitized by a two-dimensional d-wave altermagnet. We reveal that the momentum-space mismatch between the superconducting gap nodes and the altermagnetic spin-splitting nodes generates a robust, twist-tunable odd-frequency spin-triplet pairing. Consequently, the macroscopic electromagnetic response of the system can be tuned from a conventional diamagnetic Meissner state to an anomalous paramagnetic Meissner effect driven entirely by the interfacial twist angle. For a dx2−y2 altermagnet, the paramagnetic response is maximized at perfect alignment (ϕ=0) and completely suppressed at a maximal twist of ϕ=π/4, while a dxy altermagnet exhibits the exact complementary behavior. Our results establish twisted altermagnetic heterostructures as a versatile platform for engineering odd-frequency pairing and macroscopic superconducting phases.
Related
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BibTeX
@misc{kia2026twisttunable,
title = {{Twist-Tunable Paramagnetic Superconductivity in $d$-wave Altermagnet/Superconductor Heterostructures}},
author = {Narges Kia and Saeed H. Abedinpour and Zahra Faraei},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.30010},
eprint = {2608.30010},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.30010},
}
RIS
TY - UNPB
TI - Twist-Tunable Paramagnetic Superconductivity in d-wave Altermagnet/Superconductor Heterostructures
AU - Narges Kia
AU - Saeed H. Abedinpour
AU - Zahra Faraei
PY - 2026
DA - 2026/08/30
PB - arXiv
DO - 10.48550/arxiv.2608.30010
UR - https://arxiv.org/abs/2608.30010
AB - The interplay between twist-angle engineering and unconventional magnetism provides a powerful new route to control quantum phenomena. We theoretically investigate a heterostructure comprising a d-wave superconductor proximitized by a two-dimensional d-wave altermagnet. We reveal that the momentum-space mismatch between the superconducting gap nodes and the altermagnetic spin-splitting nodes generates a robust, twist-tunable odd-frequency spin-triplet pairing. Consequently, the macroscopic electromagnetic response of the system can be tuned from a conventional diamagnetic Meissner state to an anomalous paramagnetic Meissner effect driven entirely by the interfacial twist angle. For a d_x^2−y^2 altermagnet, the paramagnetic response is maximized at perfect alignment (ϕ=0) and completely suppressed at a maximal twist of ϕ=π/4, while a d_xy altermagnet exhibits the exact complementary behavior. Our results establish twisted altermagnetic heterostructures as a versatile platform for engineering odd-frequency pairing and macroscopic superconducting phases.
ER -