Anomalous Superconductivity in Twisted MoTe2 Nanojunctions
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arXiv
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2024
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| author | Jia, Yanyu Song, Tiancheng Zheng, Zhaoyi Joy Cheng, Guangming Uzan, Ayelet J Yu, Guo Tang, Yue Pollak, Connor J. Yuan, Fang Onyszczak, Michael Watanabe, Kenji Taniguchi, Takashi Lei, Shiming Yao, Nan Schoop, Leslie M Ong, N. P. Wu, Sanfeng |
| author_facet | Jia, Yanyu Song, Tiancheng Zheng, Zhaoyi Joy Cheng, Guangming Uzan, Ayelet J Yu, Guo Tang, Yue Pollak, Connor J. Yuan, Fang Onyszczak, Michael Watanabe, Kenji Taniguchi, Takashi Lei, Shiming Yao, Nan Schoop, Leslie M Ong, N. P. Wu, Sanfeng |
| contents | Introducing superconductivity in topological materials can lead to innovative electronic phases and device functionalities. Here, we present a new strategy for quantum engineering of superconducting junctions in moire materials through direct, on-chip, and fully encapsulated 2D crystal growth. We achieve robust and designable superconductivity in Pd-metalized twisted bilayer molybdenum ditelluride (MoTe2) and observe anomalous superconducting effects in high-quality junctions across ~ 20 moire cells. Surprisingly, the junction develops enhanced, instead of weakened, superconducting behaviors, exhibiting fluctuations to a higher critical magnetic field compared to its adjacent Pd7MoTe2 superconductor. Additionally, the critical current further exhibits a striking V-shaped minimum at zero magnetic field. These features are unexpected in conventional Josephson junctions and indeed absent in junctions of natural bilayer MoTe2 created using the same approach. We discuss implications of these observations, including the possible formation of mixed even- and odd-parity superconductivity at the moire junctions. Our results also demonstrate a pathway to engineer and investigate superconductivity in fractional Chern insulators. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_04594 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anomalous Superconductivity in Twisted MoTe2 Nanojunctions Jia, Yanyu Song, Tiancheng Zheng, Zhaoyi Joy Cheng, Guangming Uzan, Ayelet J Yu, Guo Tang, Yue Pollak, Connor J. Yuan, Fang Onyszczak, Michael Watanabe, Kenji Taniguchi, Takashi Lei, Shiming Yao, Nan Schoop, Leslie M Ong, N. P. Wu, Sanfeng Superconductivity Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Introducing superconductivity in topological materials can lead to innovative electronic phases and device functionalities. Here, we present a new strategy for quantum engineering of superconducting junctions in moire materials through direct, on-chip, and fully encapsulated 2D crystal growth. We achieve robust and designable superconductivity in Pd-metalized twisted bilayer molybdenum ditelluride (MoTe2) and observe anomalous superconducting effects in high-quality junctions across ~ 20 moire cells. Surprisingly, the junction develops enhanced, instead of weakened, superconducting behaviors, exhibiting fluctuations to a higher critical magnetic field compared to its adjacent Pd7MoTe2 superconductor. Additionally, the critical current further exhibits a striking V-shaped minimum at zero magnetic field. These features are unexpected in conventional Josephson junctions and indeed absent in junctions of natural bilayer MoTe2 created using the same approach. We discuss implications of these observations, including the possible formation of mixed even- and odd-parity superconductivity at the moire junctions. Our results also demonstrate a pathway to engineer and investigate superconductivity in fractional Chern insulators. |
| title | Anomalous Superconductivity in Twisted MoTe2 Nanojunctions |
| topic | Superconductivity Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.04594 |