Prepatterned Superconducting Contacts for Clean Superconductor-Topological Material Interfaces Enabling Long-Range Josephson Coupling.
basic_science · Level V
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- Record sourced from PubMed, PMID 42170751.
- Also identified by DOI 10.1021/acs.nanolett.6c01428.
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Abstract
Phase-coherent superconducting proximity in topological materials (TMs) requires clean superconductor-topological material (SC-TM) interfaces, yet conventional top-contact fabrication often degrades them through oxidation, polymer residue, and process-induced disorder. Here we introduce a prepatterned superconducting bottom-contact architecture in which MoRe/Au electrodes are defined before van der Waals (vdW) crystal transfer, thereby avoiding on-flake lithography after transfer. In WTe<sub>2</sub>- and Bi<sub>1.5</sub>Sb<sub>0.5</sub>Te<sub>1.7</sub>Se<sub>1.3</sub>-based Josephson junctions, this architecture yields systematically larger <i>I</i><sub>c</sub><i>R</i><sub>N</sub> and longer-ranged coupling than conventional top contacts. Cross-sectional scanning transmission electron microscopy/energy-dispersive spectroscopy reveals atomically abrupt, chemically well-separated interfaces. These results establish prepatterned SC-TM contacts as a practical route to reproducible, micrometer-scale Josephson platforms in vdW TMs.