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Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene
The coexistence of gate-tunable superconducting, magnetic and topological orders in magic-angle twisted bilayer graphene provides opportunities for the creation of hybrid Josephson junctions. Here we report the fabrication of gate-defined symmetry-broken Josephson junctions in magic-angle twisted bi...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10133447/ https://www.ncbi.nlm.nih.gov/pubmed/37100775 http://dx.doi.org/10.1038/s41467-023-38005-7 |
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author | Díez-Mérida, J. Díez-Carlón, A. Yang, S. Y. Xie, Y.-M. Gao, X.-J. Senior, J. Watanabe, K. Taniguchi, T. Lu, X. Higginbotham, A. P. Law, K. T. Efetov, Dmitri K. |
author_facet | Díez-Mérida, J. Díez-Carlón, A. Yang, S. Y. Xie, Y.-M. Gao, X.-J. Senior, J. Watanabe, K. Taniguchi, T. Lu, X. Higginbotham, A. P. Law, K. T. Efetov, Dmitri K. |
author_sort | Díez-Mérida, J. |
collection | PubMed |
description | The coexistence of gate-tunable superconducting, magnetic and topological orders in magic-angle twisted bilayer graphene provides opportunities for the creation of hybrid Josephson junctions. Here we report the fabrication of gate-defined symmetry-broken Josephson junctions in magic-angle twisted bilayer graphene, where the weak link is gate-tuned close to the correlated insulator state with a moiré filling factor of υ = −2. We observe a phase-shifted and asymmetric Fraunhofer pattern with a pronounced magnetic hysteresis. Our theoretical calculations of the junction weak link—with valley polarization and orbital magnetization—explain most of these unconventional features. The effects persist up to the critical temperature of 3.5 K, with magnetic hysteresis observed below 800 mK. We show how the combination of magnetization and its current-induced magnetization switching allows us to realise a programmable zero-field superconducting diode. Our results represent a major advance towards the creation of future superconducting quantum electronic devices. |
format | Online Article Text |
id | pubmed-10133447 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-101334472023-04-28 Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene Díez-Mérida, J. Díez-Carlón, A. Yang, S. Y. Xie, Y.-M. Gao, X.-J. Senior, J. Watanabe, K. Taniguchi, T. Lu, X. Higginbotham, A. P. Law, K. T. Efetov, Dmitri K. Nat Commun Article The coexistence of gate-tunable superconducting, magnetic and topological orders in magic-angle twisted bilayer graphene provides opportunities for the creation of hybrid Josephson junctions. Here we report the fabrication of gate-defined symmetry-broken Josephson junctions in magic-angle twisted bilayer graphene, where the weak link is gate-tuned close to the correlated insulator state with a moiré filling factor of υ = −2. We observe a phase-shifted and asymmetric Fraunhofer pattern with a pronounced magnetic hysteresis. Our theoretical calculations of the junction weak link—with valley polarization and orbital magnetization—explain most of these unconventional features. The effects persist up to the critical temperature of 3.5 K, with magnetic hysteresis observed below 800 mK. We show how the combination of magnetization and its current-induced magnetization switching allows us to realise a programmable zero-field superconducting diode. Our results represent a major advance towards the creation of future superconducting quantum electronic devices. Nature Publishing Group UK 2023-04-26 /pmc/articles/PMC10133447/ /pubmed/37100775 http://dx.doi.org/10.1038/s41467-023-38005-7 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Díez-Mérida, J. Díez-Carlón, A. Yang, S. Y. Xie, Y.-M. Gao, X.-J. Senior, J. Watanabe, K. Taniguchi, T. Lu, X. Higginbotham, A. P. Law, K. T. Efetov, Dmitri K. Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene |
title | Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene |
title_full | Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene |
title_fullStr | Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene |
title_full_unstemmed | Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene |
title_short | Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene |
title_sort | symmetry-broken josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10133447/ https://www.ncbi.nlm.nih.gov/pubmed/37100775 http://dx.doi.org/10.1038/s41467-023-38005-7 |
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