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Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers

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2021

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Beck, Philip
Schneider, Lucas
Palotás, Krisztián
Lászlóffy, András
Szunyogh, László
Wiebe, Jens
Wiesendanger, Roland

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Nature Communications. Springer. 2021, 12, 2040. eISSN 2041-1723. Available under: doi: 10.1038/s41467-021-22261-6

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Magnetic atoms coupled to the Cooper pairs of a superconductor induce Yu-Shiba-Rusinov states (in short Shiba states). In the presence of sufficiently strong spin-orbit coupling, the bands formed by hybridization of the Shiba states in ensembles of such atoms can support low-dimensional topological superconductivity with Majorana bound states localized on the ensembles’ edges. Yet, the role of spin-orbit coupling for the hybridization of Shiba states in dimers of magnetic atoms, the building blocks for such systems, is largely unexplored. Here, we reveal the evolution of hybridized multi-orbital Shiba states from a single Mn adatom to artificially constructed ferromagnetically and antiferromagnetically coupled Mn dimers placed on a Nb(110) surface. Upon dimer formation, the atomic Shiba orbitals split for both types of magnetic alignment. Our theoretical calculations attribute the unexpected splitting in antiferromagnetic dimers to spin-orbit coupling and broken inversion symmetry at the surface. Our observations point out the relevance of previously unconsidered factors on the formation of Shiba bands and their topological classification.

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530 Physik

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ISO 690BECK, Philip, Lucas SCHNEIDER, Levente RÓZSA, Krisztián PALOTÁS, András LÁSZLÓFFY, László SZUNYOGH, Jens WIEBE, Roland WIESENDANGER, 2021. Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers. In: Nature Communications. Springer. 2021, 12, 2040. eISSN 2041-1723. Available under: doi: 10.1038/s41467-021-22261-6
BibTex
@article{Beck2021Spino-67205,
  year={2021},
  doi={10.1038/s41467-021-22261-6},
  title={Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers},
  volume={12},
  journal={Nature Communications},
  author={Beck, Philip and Schneider, Lucas and Rózsa, Levente and Palotás, Krisztián and Lászlóffy, András and Szunyogh, László and Wiebe, Jens and Wiesendanger, Roland},
  note={Article Number: 2040}
}
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