Abstract
The hybridization of Yu-Shiba-Rusinov (YSR) states in dimers of magnetic impurities leads to molecularlike bonding and antibonding modes. In many-impurity systems, the interaction gives rise to YSR bands and can even result in the formation of a topologically nontrivial superconducting state, characterized by Majorana fermions at the edges of the system. To obtain a more detailed understanding of these interactions, we investigate the coupling of YSR states in short one-dimensional Fe chains on clean Nb(110). We observe a splitting of the single-atom YSR peaks into multiple states with even or odd spatial symmetry and identify a peculiar dependence of the even and odd states' energy position on the chain length.
- Received 11 March 2021
- Revised 14 June 2021
- Accepted 14 June 2021
DOI:https://doi.org/10.1103/PhysRevB.103.235437
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