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O: Fachverband Oberflächenphysik

O 26: Poster Session II: Nanostructures at surfaces II

O 26.5: Poster

Monday, March 1, 2021, 13:30–15:30, P

Coupling of YSR states in 1D chains of Fe atoms on Nb(110) — •Felix Friedrich, Robin Boshuis, Matthias Bode, and Artem Odobesko — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

The pair-breaking potential of magnetic impurities in a superconducting host material gives rise to in-gap peaks, so called Yu-Shiba-Rusinov (YSR) states. Coupling of these states leads to the formation of molecular-like bonding and antibonding modes in impurity dimers [1], YSR bands in many impurity systems [2], and constitutes a platform for the formation of Majorana fermions at the ends of one-dimensional chains [3]. To obtain a more detailed understanding of the interaction of multiple magnetic impurities, we investigate the coupling of YSR states in short one-dimensional Fe chains on clean Nb(110). By functionalizing STM tips with a CO molecule we are able to resolve single atoms in nearest neighbor lattice positions of self-assembled Fe chains. Spectroscopic measurements reveal that the splitting of the single atom YSR states becomes more complex with increasing chain length. Furthermore, differential conductivity maps uncover an intriguing dependence of the odd or even spatial symmetry of the individual states on the chain length. The experimental results will be compared to theoretical models.
[1] S.-H. Ji et al., Phys. Rev. Lett. 100, 226801 (2008)
[2] M. Ruby et al., Phys. Rev. Lett. 115, 197204 (2015)
[3] S. Nadj-Perge et al., Science 346, 602 (2014)