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MA: Fachverband Magnetismus
MA 20: PhD Focus Session: Symposium on SStrange Bedfellows – Magnetism Meets Superconductivity" (joint session MA/AKjDPG)
MA 20.3: Hauptvortrag
Dienstag, 17. März 2020, 10:30–11:00, HSZ 04
Yu-Shiba-Rusinov states of single magnetic atoms and nanostructures probed by scanning tunneling spectroscopy — Eva Liebhaber1, Michael Ruby1, Benjamin W. Heinrich1, Gaël Reecht1, Kai Rossnagel2,3, Felix von Oppen1,4, and •Katharina J. Franke1 — 1Freie Universität Berlin, Berlin, Germany — 2Christian-Albrechts-Universität Kiel, Kiel, Germany — 3Deutsches Elektronen Synchrotron, Hamburg, Germany — 4Dahlem Center for Complex Quantum Systems, Berlin, Germany
The exchange coupling of individual magnetic atoms with the Cooper pairs of a superconducting substrate leads to Yu-Shiba-Rusinov (YSR) bound states inside the superconducting energy gap. Their bound state energy and spatial extent can be probed by scanning tunneling spectroscopy [1-4]. Chains of magnetic adatoms have attracted particularly strong attention due to the formation of Majorana bound states at their terminations [5].
Here, we investigate individual magnetic atoms on Pb and 2H-NbSe2 substrates. We observe intriguing patterns of YSR states around the adatoms, which are determined by the adatom’s d-levels as well as local symmetries of the adsorption potential. When the adatoms are sufficiently close, the YSR states hybridize, eventually giving rise to YSR bands in atomic chains.
[1] Yazdani et al., Science 275, 1767 (1997); [2] Ji et al., Phys. Rev. Lett. 100, 226801 (2008); [3] Franke et al., Science 332, 940 (2011); [4] Ménard et al., Nature Phys. 11, 1013 (2015); [5] Nadj-Perge et al., Science 346, 602 (2014).