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Search for large topological gaps in atomic spin chains on proximitized superconducting heavy-metal layers

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2023

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Beck, Philip
Nyári, Bendegúz
Schneider, Lucas
Lászlóffy, András
Palotás, Krisztián
Szunyogh, László
Ujfalussy, Balázs
Wiebe, Jens
Wiesendanger, Roland

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Communications Physics. Springer. 2023, 6, 83. eISSN 2399-3650. Available under: doi: 10.1038/s42005-023-01196-y

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One-dimensional systems comprising s-wave superconductivity with meticulously tuned magnetism realize topological superconductors hosting Majorana modes whose stability is determined by the gap size. However, for atomic spin chains on superconductors, the effect of the substrate’s spin-orbit coupling on the topological gap is largely unexplored. Here, we introduce an atomic layer of the heavy metal gold on a niobium surface combining strong spin-orbit coupling and a large superconducting gap with a high crystallographic quality, enabling the assembly of defect-free iron chains using a scanning tunneling microscope tip. Scanning tunneling spectroscopy experiments and density functional theory calculations reveal ungapped Yu–Shiba–Rusinov bands in the ferromagnetic chain despite the heavy substrate. By artificially imposing a spin spiral state, the calculations indicate minigap opening and zero-energy edge state formation. The methodology enables a material screening of heavy-metal layers on elemental superconductors for ideal systems hosting Majorana edge modes protected by large topological gaps.

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ISO 690BECK, Philip, Bendegúz NYÁRI, Lucas SCHNEIDER, Levente RÓZSA, András LÁSZLÓFFY, Krisztián PALOTÁS, László SZUNYOGH, Balázs UJFALUSSY, Jens WIEBE, Roland WIESENDANGER, 2023. Search for large topological gaps in atomic spin chains on proximitized superconducting heavy-metal layers. In: Communications Physics. Springer. 2023, 6, 83. eISSN 2399-3650. Available under: doi: 10.1038/s42005-023-01196-y
BibTex
@article{Beck2023Searc-67717,
  year={2023},
  doi={10.1038/s42005-023-01196-y},
  title={Search for large topological gaps in atomic spin chains on proximitized superconducting heavy-metal layers},
  volume={6},
  journal={Communications Physics},
  author={Beck, Philip and Nyári, Bendegúz and Schneider, Lucas and Rózsa, Levente and Lászlóffy, András and Palotás, Krisztián and Szunyogh, László and Ujfalussy, Balázs and Wiebe, Jens and Wiesendanger, Roland},
  note={Article Number: 83}
}
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