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
Department of Physics, Princeton University, Princeton, NJ 08544, USA.
Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ 08544, USA.
Sci Adv. 2025 Jan 31;11(5):eadq5712. doi: 10.1126/sciadv.adq5712. Epub 2025 Jan 29.
Introducing superconductivity in topological materials can lead to innovative electronic phases and device functionalities. Here, we present a unique strategy for quantum engineering of superconducting junctions in moiré materials through direct, on-chip, and fully encapsulated 2D crystal growth. We achieve robust and designable superconductivity in Pd-metalized twisted bilayer molybdenum ditelluride (MoTe) and observe anomalous superconducting effects in high-quality junctions across ~20 moiré cells. Unexpectedly, the junction develops enhanced, instead of weakened, superconducting behaviors, exhibiting fluctuations to a higher critical magnetic field compared to its adjacent PdMoTe superconductor. In addition, the critical current further exhibits a notable V-shaped minimum at zero magnetic field. These features are unexpected in conventional Josephson junctions and absent in junctions of natural bilayer MoTe created using the same approach. We discuss implications of these observations, including the possible formation of mixed even- and odd-parity superconductivity at the moiré junctions. Our results also demonstrate a pathway to engineer and investigate superconductivity in fractional Chern insulators.
在拓扑材料中引入超导性可导致创新的电子相和器件功能。在此，我们展示了一种独特的策略，通过直接、片上且完全封装的二维晶体生长，对莫尔材料中的超导结进行量子工程。我们在钯金属化的扭曲双层碲化钼（MoTe）中实现了稳健且可设计的超导性，并在跨越约20个莫尔晶胞的高质量结中观察到异常超导效应。出乎意料的是，该结展现出增强而非减弱的超导行为，与相邻的钯钼碲超导体相比，其对更高临界磁场表现出涨落。此外，临界电流在零磁场下进一步呈现出显著的V形最小值。这些特征在传统约瑟夫森结中是意想不到的，并且在用相同方法制备的天然双层MoTe结中也不存在。我们讨论了这些观察结果的意义，包括在莫尔结处可能形成的奇偶混合超导性。我们的结果还展示了在分数陈绝缘体中设计和研究超导性的途径。
