Journal Article FZJ-2023-05898

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Two-dimensional Shiba lattices as a possible platform for crystalline topological superconductivity

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2023
Nature Publishing Group Basingstoke

Nature physics 19(12), 1848 - 1854 () [10.1038/s41567-023-02104-5]

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Abstract: Localized or propagating Majorana boundary modes are the key feature of topological superconductors. They are rare in naturally occurring compounds, but the tailored manipulation of quantum matter offers opportunities for their realization. Specifically, lattices of Yu–Shiba–Rusinov bound states—Shiba lattices—that arise when magnetic adatoms are placed on the surface of a conventional superconductor can be used to create topological bands within the superconducting gap of the substrate. Here we reveal two signatures consistent with the realization of two types of mirror-symmetry-protected topological superconductor using scanning tunnelling microscopy to create and probe adatom lattices with single-atom precision. The first has edge modes as well as higher-order corner states, and the second has symmetry-protected bulk nodal points. In principle, their topological character and boundary modes should be protected by the spatial symmetries of the adatom lattice. Our results highlight the potential of Shiba lattices as a platform to design the topology and sample geometry of two-dimensional superconductors.

Classification:

Contributing Institute(s):
  1. Quanten-Theorie der Materialien (IAS-1)
  2. Quanten-Theorie der Materialien (PGI-1)
Research Program(s):
  1. 5211 - Topological Matter (POF4-521) (POF4-521)

Appears in the scientific report 2023
Database coverage:
Medline ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Nature ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 15 ; JCR ; NationallizenzNationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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 Record created 2023-12-29, last modified 2024-02-26


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