Realization of Air‐Stable Two‐Dimensional Superconductor Nb ₂ Pd ₃ Te ₅ With Quasi‐One‐Dimensional Pair Density Modulation

ABSTRACT Two‐dimensional (2D) superconductors provide a fertile platform for exploring reduced‐dimensional superconductivity and emergent quantum phenomena. Incorporating quasi‐one‐dimensional (quasi‐1D) structural motifs into 2D superconductors offers a powerful route to engineer strong electronic anisotropy, enabling unconventional superconducting states and anisotropic superconducting transport functionalities. However, such systems remain rarely realized. Here we report the realization of a 2D superconductor Nb 2 Pd 3 Te 5 , exhibiting an intrinsic quasi‐1D pair density modulation. Monolayer and bilayer Nb 2 Pd 3 Te 5 is synthesized via van‐der‐Waals epitaxy. Using ultralow‐temperature scanning tunneling microscopy/spectroscopy, we observe the quasi‐1D crystal structure and superconductivity below ∼0.6 K with a pronounced quasi‐1D pair density modulation. Remarkably, both monolayer and bilayer Nb 2 Pd 3 Te 5 show strong air stability. Our findings establish atomically 2D Nb 2 Pd 3 Te 5 as a robust and promising platform for exploring novel low‐dimensional quantum phenomena and anisotropy‐enabled superconducting devices.