In-plane and out-of-plane magnetic field driven Josephson diode effect in magic-angle twisted four-layer graphene
Abstract
The superconducting diode effect offers a powerful probe into the fundamental symmetries of quantum materials. Recent studies on twisted graphene diodes have predominantly focused on bilayer or trilayer systems under out-of-plane magnetic fields. Here, we demonstrate both out-of-plane and in-plane driven Josephson diode effects in a magic-angle twisted four-layer graphene junction, i.e., an even number of layers. We observe the emergence of a diode effect at zero out-of-plane field, tuned by an increasing in-plane magnetic field. This result points to the presence of strong in-plane orbital coupling, which is highly sensitive to the specific layer parity of the structure. Our findings provide experimental insights into the symmetry-breaking mechanisms of even-layer twisted graphene, establishing in-plane magnetic fields as a vital tool for unravelling their microscopic properties.
Related
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BibTeX
@misc{perego2026inplane,
title = {{In-plane and out-of-plane magnetic field driven Josephson diode effect in magic-angle twisted four-layer graphene}},
author = {Marta Perego and Sayan Banerjee and Mohamad Abu El Hija and Clara Galante Agero and Alexandra Mestre-Torà and Giovanni Zhang and Takashi Taniguchi and Kenji Watanabe and Mathias S. Scheurer and Thomas Ihn and Klaus Ensslin},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.21229},
eprint = {2606.21229},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.21229},
}
RIS
TY - UNPB
TI - In-plane and out-of-plane magnetic field driven Josephson diode effect in magic-angle twisted four-layer graphene
AU - Marta Perego
AU - Sayan Banerjee
AU - Mohamad Abu El Hija
AU - Clara Galante Agero
AU - Alexandra Mestre-Torà
AU - Giovanni Zhang
AU - Takashi Taniguchi
AU - Kenji Watanabe
AU - Mathias S. Scheurer
AU - Thomas Ihn
AU - Klaus Ensslin
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2606.21229
UR - https://arxiv.org/abs/2606.21229
AB - The superconducting diode effect offers a powerful probe into the fundamental symmetries of quantum materials. Recent studies on twisted graphene diodes have predominantly focused on bilayer or trilayer systems under out-of-plane magnetic fields. Here, we demonstrate both out-of-plane and in-plane driven Josephson diode effects in a magic-angle twisted four-layer graphene junction, i.e., an even number of layers. We observe the emergence of a diode effect at zero out-of-plane field, tuned by an increasing in-plane magnetic field. This result points to the presence of strong in-plane orbital coupling, which is highly sensitive to the specific layer parity of the structure. Our findings provide experimental insights into the symmetry-breaking mechanisms of even-layer twisted graphene, establishing in-plane magnetic fields as a vital tool for unravelling their microscopic properties.
ER -