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Peter Grünberg Institute – Quantum Theory of Materials (PGI-1 / IAS-1) (Forschungszentrum Jülich)
Replication Data for: Engineering epitaxial interfaces for topological insulator – superconductor hybrid devices with Al electrodes
Version 1.0
Jalil, Abdur Rehman; Schmitt, Tobias, W.; Rüßmann, Philipp; Wei, Xian-Kui; Frohn, Benedikt; Schleenvoigt, Michael; Wittl, Wilhelm; Hou, Xiao; Schmidt, Anne; Underwood, Kaycee; Bihlmayer, Gustav; Luysberg, Martina; Mayer, Joachim; Blügel, Stefan; Grützmacher, Detlev; Schüffelgen, Peter, 2024, "Replication Data for: Engineering epitaxial interfaces for topological insulator – superconductor hybrid devices with Al electrodes", https://doi.org/10.26165/JUELICH-DATA/XJICAR, Jülich DATA, V1
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Description
Proximity-induced superconductivity in hybrid devices of topological insulators and superconductors offers a promising platform for the pursuit of elusive topological superconductivity and its anticipated applications, such as fault-tolerant quantum computing. To study and harness such hybrid devices, a key challenge is the realization of highly functional material interfaces with a suitable superconductor featuring 2e-periodic parity-conserving transport to ensure a superconducting hard-gap free of unpaired electrons, which is important for Majorana physics. A superconductor well-known for this characteristic is Al, however, its direct integration into devices based on tetradymite topological insulators has so far been found to yield non-transparent interfaces. By focusing on Bi₂Te₃-Al heterostructures, this study identifies detrimental interdiffusion processes at the interface through atomically resolved structural and chemical analysis, and showcase their mitigation by leveraging different interlayers – namely Nb, Ti, Pd, and Pt – between Bi₂Te₃ and Al. Through structural transformation of the interlayer materials (X) into their respective tellurides (XTe₂) atomically-sharp epitaxial interfaces are engineered and further characterized in low-temperature transport experiments on Al-X-Bi₂Te₃-X-Al Josephson junctions and in complementary density functional theory calculations. By demonstrating functional interfaces between Bi₂Te₃ and Al, this work provides key insights and paves the way for the next generation of sophisticated topological devices.
Subject Physics
Keyword topological superconductivity, superconductors, epitaxial interfaces, interface engineering, Majorana platform, hybrid devices, Josephson junctions, TMDC, topological insulator, DFT
Related Publication Abdur Rehman Jalil, Tobias W. Schmitt, Philipp Rüßmann, Xian-Kui Wei, Benedikt Frohn, Michael Schleenvoigt, Wilhelm Wittl, Xiao Hou, Anne Schmidt, Kaycee Underwood, Gustav Bihlmayer, Martina Luysberg, Joachim Mayer, Stefan Blügel, Detlev Grützmacher, Peter Schüffelgen, Engineering epitaxial interfaces for topological insulator – superconductor hybrid devices with Al electrodes, Materials Cloud Archive 2024.174 (2024) doi: 10.24435/materialscloud:w3-3c
Institute ER-C-1; ER-C-2; IAS-1; PGI-1; PGI-9
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