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arXiv 2409.04594cond-mat.supr-concond-mat.mes-hallcond-mat.mtrl-scicond-mat.str-el
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扭曲MoTe2纳米结中的反常超导性

Anomalous Superconductivity in Twisted MoTe2 Nanojunctions

Yanyu Jia, Tiancheng Song, Zhaoyi Joy Zheng, Guangming Cheng, Ayelet J Uzan, Guo Yu, Yue Tang, Connor J. Pollak, Fang Yuan, Michael Onyszczak, Kenji Watanabe, T… 展开作者

Yanyu Jia, Tiancheng Song, Zhaoyi Joy Zheng, Guangming Cheng, Ayelet J Uzan, Guo Yu, Yue Tang, Connor J. Pollak, Fang Yuan, Michael Onyszczak, Kenji Watanabe, Takashi Taniguchi, Shiming Lei, Nan Yao, Leslie M Schoop, N. P. Ong, Sanfeng Wu

AI总结:

本研究提出通过完全封装的2D晶体生长在莫尔材料中构建超导结,在Pd金属化的扭曲双层MoTe2中实现了稳健超导性,并观察到临界磁场增强和零场下V型临界电流极小值等反常现象,为研究分数量子霍尔绝缘体超导性提供了新途径。

摘要:

在拓扑材料中引入超导性可以带来创新的电子相和器件功能。在此,我们提出了一种通过直接、片上且完全封装的2D晶体生长来对莫尔材料中的超导结进行量子工程的新策略。我们在Pd金属化的扭曲双层二碲化钼(MoTe2)中实现了稳健且可设计的超导性,并在跨越约20个莫尔单元的高质量结中观察到了反常超导效应。令人惊讶的是,该结表现出增强而非减弱的超导行为,与相邻的Pd7MoTe2超导体相比,其涨落达到了更高的临界磁场。此外,临界电流在零磁场下进一步表现出显著的V型极小值。这些特征在传统约瑟夫森结中是意料之外的,并且确实在使用相同方法创建的自然双层MoTe2结中不存在。我们讨论了这些观察结果的含义,包括在莫尔结中可能形成混合的偶宇称和奇宇称超导性。我们的结果还展示了一条工程化和研究分数量子霍尔绝缘体中超导性的途径。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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