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, Takashi Taniguchi, Shiming Lei, Nan Yao, Leslie M Schoop, N. P. Ong, Sanfeng Wu
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Abstract

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.
扭曲 MoTe2 纳米结中的反常超导性
在拓扑材料中引入超导性可以带来创新的电子相位和器件功能。在这里,我们提出了一种新策略,通过直接、片上和完全封装的二维晶体生长,在摩尔材料中实现超导结的量子工程。我们在钯金属化扭曲双层钼碲化物(MoTe2)中实现了稳健的可设计超导性,并在约 20 个摩尔单元的高质量结中观察到了异常超导效应。令人惊讶的是,与相邻的钯7碲化钼2超导体相比,该结点的超导行为非但没有减弱,反而增强了,表现出较高临界磁场的波动。此外,临界电流在零磁场时进一步表现出惊人的 V 形最小值。这些特征在传统的约瑟夫森结中是意想不到的,而且在使用相同方法制造的天然双层 MoTe2 结中也不存在。我们讨论了这些观察结果的意义,包括在摩尔结上可能形成的偶数和奇数混合超导。我们的研究结果还展示了在分数切尔宁缓冲器中设计和研究超导性的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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