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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.23148 |
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| _version_ | 1866911712655966208 |
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| author | Choi, Yong-Bin Choi, Chang-Won Holtzman, Luke Kim, Hoil Kang, Seongwoo Watanabe, Kenji Taniguchi, Takashi Hone, James Kim, Jun Sung Choi, Si-Young Lee, Gil-Ho |
| author_facet | Choi, Yong-Bin Choi, Chang-Won Holtzman, Luke Kim, Hoil Kang, Seongwoo Watanabe, Kenji Taniguchi, Takashi Hone, James Kim, Jun Sung Choi, Si-Young Lee, Gil-Ho |
| contents | Phase-coherent superconducting proximity in topological materials 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 pre-patterned superconducting bottom-contact architecture in which MoRe/Au electrodes are defined before van der Waals crystal transfer, thereby avoiding on-flake lithography after transfer. In WTe2- and Bi1.5Sb0.5Te1.7Se1.3-based Josephson junctions, this architecture yields systematically larger I_c R_N and longer-ranged coupling than conventional top contacts. Cross-sectional STEM/EDS reveals atomically abrupt, chemically well-separated interfaces. These results establish pre-patterned SC-TM contacts as a practical route to reproducible, micrometer-scale Josephson platforms in van der Waals topological materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_23148 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Pre-Patterned Superconducting Contacts for Clean Superconductor-Topological Material Interfaces Enabling Long-Range Josephson Coupling Choi, Yong-Bin Choi, Chang-Won Holtzman, Luke Kim, Hoil Kang, Seongwoo Watanabe, Kenji Taniguchi, Takashi Hone, James Kim, Jun Sung Choi, Si-Young Lee, Gil-Ho Mesoscale and Nanoscale Physics Superconductivity Phase-coherent superconducting proximity in topological materials 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 pre-patterned superconducting bottom-contact architecture in which MoRe/Au electrodes are defined before van der Waals crystal transfer, thereby avoiding on-flake lithography after transfer. In WTe2- and Bi1.5Sb0.5Te1.7Se1.3-based Josephson junctions, this architecture yields systematically larger I_c R_N and longer-ranged coupling than conventional top contacts. Cross-sectional STEM/EDS reveals atomically abrupt, chemically well-separated interfaces. These results establish pre-patterned SC-TM contacts as a practical route to reproducible, micrometer-scale Josephson platforms in van der Waals topological materials. |
| title | Pre-Patterned Superconducting Contacts for Clean Superconductor-Topological Material Interfaces Enabling Long-Range Josephson Coupling |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2603.23148 |