Engineering epitaxial interfaces for topological insulator – superconductor hybrid devices with Al electrodes

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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Jalil, Abdur Rehman</dc:creator>
  <dc:creator>Schmitt, Tobias W.</dc:creator>
  <dc:creator>Rüßmann, Philipp</dc:creator>
  <dc:creator>Wei, Xian-Kui</dc:creator>
  <dc:creator>Frohn, Benedikt</dc:creator>
  <dc:creator>Schleenvoigt, Michael</dc:creator>
  <dc:creator>Wittl, Wilhelm</dc:creator>
  <dc:creator>Hou, Xiao</dc:creator>
  <dc:creator>Schmidt, Anne</dc:creator>
  <dc:creator>Underwood, Kaycee</dc:creator>
  <dc:creator>Bihlmayer, Gustav</dc:creator>
  <dc:creator>Luysberg, Martina</dc:creator>
  <dc:creator>Mayer, Joachim</dc:creator>
  <dc:creator>Blügel, Stefan</dc:creator>
  <dc:creator>Grützmacher, Detlev</dc:creator>
  <dc:creator>Schüffelgen, Peter</dc:creator>
  <dc:date>2024-10-28</dc:date>
  <dc: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.</dc:description>
  <dc:identifier>https://materialscloud-archive-failover.cineca.it/record/2024.174</dc:identifier>
  <dc:identifier>doi:10.24435/materialscloud:w3-3c</dc:identifier>
  <dc:identifier>mcid:2024.174</dc:identifier>
  <dc:identifier>oai:materialscloud.org:2360</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Materials Cloud</dc:publisher>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode</dc:rights>
  <dc:subject>topological superconductivity</dc:subject>
  <dc:subject>superconductors</dc:subject>
  <dc:subject>epitaxial interfaces</dc:subject>
  <dc:subject>interface engineering</dc:subject>
  <dc:subject>Majorana platform</dc:subject>
  <dc:subject>hybrid devices</dc:subject>
  <dc:subject>Josephson junctions</dc:subject>
  <dc:subject>TMDC</dc:subject>
  <dc:subject>topological insulator</dc:subject>
  <dc:subject>topological materials</dc:subject>
  <dc:subject>JuKKR</dc:subject>
  <dc:subject>FLEUR</dc:subject>
  <dc:subject>DFT</dc:subject>
  <dc:title>Engineering epitaxial interfaces for topological insulator – superconductor hybrid devices with Al electrodes</dc:title>
  <dc:type>Dataset</dc:type>
</oai_dc:dc>